3278B - Measurement Daytronic - Free user manual and instructions

USER MANUAL 3278B Daytronic

with options C,G & P

STRAIN GAGE CONDITIONER

INSTRUCTION MANUAL

-187135 -18235 +1915 +2.145 [phone] -9925

3000
Instrument Series

Copyright © 1996, Daytronic Corporation. All rights reserved.

No part of this document may be reprinted, reproduced, or used in any form or by any electronic, mechanical, or other means, including photocopying and recording, or in any information storage and retrieval system, without permission in writing from Daytronic Corporation. All specifications are subject to change without notice.

Correction

to Model 3178 Instruction Manual, v. SB.5.1

The I/O Wiring Data in Fig. 4 of this manual does not give the correct shield pairing of cable wires, which is shown in the revised diagrams below and on the following page:

(cont'd)

Correction

to Model 3178 Instruction Manual, v. SB.5.1 (cont'd)

Daytronic 3X78 Instrument to Generalized Strain Gage Transducer Showing CAL SENSE Connection

A 1 +SENSE 2 -SENSE 3 CAL SENSE 4 SHIELD 9 + EXC 4-Wire Configuration for Cables Shorter Than 20 Feet +SIG -SIG -EXC 6-Wire Configura Shorter Than 20 Feet 1 +SENSE A

8-Wire Configuration for Cables Longer Than 20 Feet

graph TD
    A["1"] --> B["+SENSE"]
    A --> C["-SENSE"]
    D["A"] --> B
    E["2"] --> B
    F["B"] --> B
    G["3"] --> H["+EXC"]
    I["4"] --> J["+SIG -SIG"]
    K["9"] --> L["SHIELD"]
    M["..."] --> N["..."]
    O["..."] --> P["..."]
    Q["..."] --> R["..."]
    S["..."] --> T["..."]
    U["..."] --> V["..."]
    W["..."] --> X["..."]
    Y["..."] --> Z["..."]
    AA["..."] --> AB["..."]
    AC["..."] --> AD["..."]
    AE["..."] --> AF["..."]
    AG["..."] --> AH["..."]
    AI["..."] --> AJ["..."]
    AK["..."] --> AL["..."]
    AM["..."] --> AN["..."]
    AO["..."] --> AP["..."]
    AQ["..."] --> AR["..."]
    AS["..."] --> AT["..."]
    AU["..."] --> AV["..."]
    AW["..."] --> AX["..."]
    AY["..."] --> AZ["..."]
    BA["..."] --> BB["..."]
    BC["..."] --> BD["..."]
    BE["..."] --> BF["..."]
    BG["..."] --> BH["..."]
    BI["..."] --> BJ["..."]
    BK["..."] --> BL["..."]
    BM["..."] --> BN["..."]
    BO["..."] --> BP["..."]
    BQ["..."] --> BR["..."]
    BS["..."] --> BT["..."]
    BU["..."] --> BV["..."]
    BW["..."] --> BX["..."]
    BY["..."] --> BZ["..."]
    CA["..."] --> CB["..."]
    CC["..."] --> CD["..."]
    CE["..."] --> CF["..."]
    DG["..."] --> DH["..."]
    DI["..."] --> DJ["..."]
    DK["..."] --> DL["..."]
    DV["..."] --> DW["..."]
    DX["..."] --> DXB["..."]
    DXB --> DXC["..."]
    DXC --> DXD["..."]
    DXD --> DXE["..."]
    DXE --> DXF["..."]
    DXF --> DXG["..."]
    DXG --> DXH["..."]
    DXH --> DXI["..."]
    DXI --> DXJ["..."]
    DXJ --> DXK["..."]
    DXK --> DXL["..."]
    DXL --> DXM["..."]
    DXM --> DXN["..."]
    DXN --> DXO["..."]
    DXO --> DXP["..."]
    DXP --> DXQ["..."]
    DXQ --> DXR["..."]
    DXR --> DXS["..."]
    DXS --> DXT["..."]
    DXT --> DXU["..."]
    DXU --> DXV["..."]
    DXV --> DXW["..."]
    DXW --> DXX["..."]

6-Wire Configuration for Cables Shorter Than 20 Feet

graph TD
    A["Input A"] -->|+SENSE| B["Switch"]
    A -->|-SENSE| B
    B -->|CAL SENSE| C["Output C"]
    B -->|-EXC| D["Output D"]
    C --> E["SHIELD"]
    D --> F["Extra Wire, paired with CAL SENSE, unconnected at Connector A"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#ffc,stroke:#333
    style F fill:#fcc,stroke:#333

MODEL

3178

STRAIN GAGE CONDITIONER

INSTRUCTION MANUAL

Daytronic Corporation

TABLE OF CONTENTS

Section Page

1 Description 1
2 Installation and Cabling 3
3 Calibration 11
4 Block Diagram Description 14
5 Verification of Normal Operation 19

LIST OF ILLUSTRATIONS

Figure Page

1 Model 3178 Strain Gage Conditioner .... 1
2 Instrument Mounting Dimensions 4
3 Instrument Panel Mounting 5
4 I/O Wiring 9
5 Front Panel Description 12
6 Block Diagram 17
7 Star Bridge Construction 20

LIST OF TABLES

Table Page

1 Specifications 2

PLEASE NOTE: Sections 6 and 7, Figures 8 and 9, and Table 2 have been removed from this manual.

If you need information regarding specific 3178 components and circuitry, please contact the Daytronic Service Department at [phone].

INSTRUCTION MANUAL MODEL 3178 STRAIN GAGE CONDITIONER

1. DESCRIPTION

The Model 3178 is a conditioner-amplifier for use with resistance strain gage transducers in applications which require an ac excitation voltage. It supplies a 3.28 kHz precision amplitude-regulated excitation, remotely sensed, to the transducer. The instrument uses a phase-sensitive carrier amplifier-demodulator design so that both direction and magnitude of the applied force are determined. The 3178 contains the necessary balancing and calibration controls and conditions/amplifies the applied input to a standard Five-Volt Data Signal Level which is the output analog signal level of 3000 Series Instruments. Two analog outputs, having low-pass cutoff frequencies of 2 Hz and 400 Hz, are provided. The filtered outputs provide for averaging or smoothing of signals containing noise or other unwanted dynamic components which are periodic in nature. Filtering removes these dynamic components so that stable digital indication and precise jitter-free control action can be obtained. The Model 3178 is shown in Figure 1 and the specifications are given in Table 1.

DAYTRONIC NULL —BALANCE— +CAL SPAN -CAL STRAIN GAGE CONDITIONER Model 3178

Figure 1. Model 3178 Strain Gage Conditioner

Transducers: 4-arm bridges, 90 to 1000 ohms. nominally 0.5 mv/v to 5 mv/v, full scale.

Cables: 4-, 5-, or 7-wire, depending on application; 1000 feet maximum length.

Bridge Excitation: Regulated 3.28 kHz ac; nominally 2 vac.

Balance Adjustments: 10-turn coarse and fine; will balance 1.5 mv/v initial unbalance.

Span Adjustments: 10-turn coarse and fine; 0.5 to 5 mv/volt, full scale.

Analog Outputs: Two analog outputs available; 0 to ±5 volts with 50% overrange, 5 milliamperes maximum. Bandpass is dc to 2 Hz or dc to 400 Hz. Active low-pass filters provide for rolloff of 60 dB per decade above cutoff frequency. Full-scale slew time is 1.4/f seconds, where f is the cutoff frequency.

Output Ripple and Noise: 0.15% of full scale (rms) maximum for 400-Hz output; 0.02% of full scale (rms) on 2-Hz output.

Accuracy: 0.05% of full scale.

Dimensions: 1.7 x 4.41 x 8.5 (HWD inches).

Operating Temperature Range: 0 to +130 degrees F.

Power Requirements: 105 to 135 volts ac, 50 to 400 Hz at 5 watts maximum.

Daytronic Corporation

The Model 3178 is useful in applications involving transformer coupling to the strain gage bridge (for example, rotary transformer torque sensors) and in certain applications that require high sensitivity with optimum signal-to-noise characteristics. Carrier amplifiers offer higher sensitivity than dc amplifiers and, since they respond only to the modulated carrier frequency, they reject certain extraneous voltages that can cause error in dc systems. These error sources include thermocouple or galvanic voltages in the cable-connector system, homopolar voltages from rotating machinery, low-frequency pickup, and 1/f noises of various origin. Consequently, the Model 3178 is an excellent instrument choice when special noise environment conditions and the need for amplification of low-level signals exist.

Calibration of the 3178 is accomplished by the conventional shunt technique, using an internally installed calibration resistor. Front-panel CAL buttons provide for shunt calibration in both the positive and negative realms. An internal symmetry control provides independent adjustment of negative realm sensitivity for transducers that do not have symmetrical slope characteristics. Positive-realm calibration can be remotely checked by means of Remote Cal terminals on the instrument I/O connector.

The 3178 Strain Gage Conditioner is also available in two additional forms. The Model 3278 contains a Digital Indicator to view the analog output of the conditioner. The Model 3378 contains a Limit section (in addition to a Digital Indicator) that provides High/OK/Low indications and outputs. The Digital Indicator and Limit features are standard to all 3000 Instruments and are covered in separate instruction manuals.

2. INSTALLATION AND CABLING

The following paragraphs provide the instructions for instrument installation and cabling.

Mounting. The 3000 Series Instruments can be operated as bench-top units or they can be rack- or panel-mounted. Clearance dimensions for a bench-mounted instrument are given in Figure 2. Panel cut-out dimensions for panel mounting are also shown in Figure 2. Up to four 3000 Series Instruments can be mounted in a 19-inch rack using the 1.75-inch high Model 3004 Rack Adaptor. Rack-mounting dimensions are also given in Figure 2. To panel mount an instrument, proceed as follows. Refer to Figure 3.

IMPORTANT: The unit is shipped with two spacer washers on the securing screws of the rear-panel I/O Connector. When panel-mounting the unit, you MUST REMOVE THESE WASHERS, so that the printed-circuit board may move forward about 1/8" during Step (f).

Figure 2. Instrument Mounting Dimensions

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3000 SERIES MODULE PANEL WITH CUT OUT AND MOUNTING HOLES 6-32 x 5/8 FILLISTER- HEAD SCREW FRONT BEZEL 2-56 x 3/8 FLAT- HEAD SCREW FRONT PANEL

Figure 3. Instrument Panel Mounting

(a) Remove the front panel by removing the two 2-56 x 3/8 flat-head screws.
(b) Remove the front bezel by removing the four 6-32 x 5/8 fillister-head screws.
(c) Make the panel cutout and drill the screw clearance holes indicated in Figure 2. The front bezel can be used as a template to define the rectangular cutout and locate the clearance holes.
(d) Hold the instrument enclosure behind the panel and reattach the front bezel to the enclosure from the front of the panel with the four remaining screws.
(e) Reinstall the front panel.
(f) Tighten the two securing screws of the rear-panel I/O connector to ensure that the connector is seated and that the conditioner printed-circuit board is pushed fully forward so that the front-panel screwdriver adjustments and buttons are accessible. These screws give approximately 1/8-inch of adjustment; consequently, this is the maximum panel thickness which should be used.

CAUTION

Do not overtighten the connector securing screws or resultant damage may occur to the printed-circuit board.

AC Power Connection. To protect operating personnel, the 3000 Series Instruments are equipped with a three-conductor power cord. When the cord is plugged into the appropriate receptacle, the instrument is grounded. The offset pin on the power cord is ground. To maintain the safety ground when operating the unit from a two-contact outlet, use a three-prong to two-prong adaptor and connect the green pigtail on the adaptor to ground.

To prepare the instrument for operation, connect the power cable to a 105-135 volt ac, 50-400 Hz power source. The instrument can use up to 5 watts of power.

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Calibration Resistor. If a fixed resistor is shunted across one arm of a strain gage bridge, it produces an unbalance equivalent to that of a particular value of mechanical input. If this Equivalent Input value is accurately known, it can be used as a reference point for shunt calibration of the system. Upon completion of installation of the transducer and its associated cabling, the user can:

(1) Perform an overall dead weight calibration using a precisely known value of mechanical input. The calibration can then be transferred to the installed calibration resistor for convenience in subsequent checking.
(2) Replace the installed calibration resistor with one (or an equivalent resistance value) supplied by the transducer manufacturer to achieve a precisely known Equivalent Input allowing the instrument sensitivity to be adjusted correctly.
(3) Determine the Equivalent Input value for the installed calibration resistor, knowing the transducer sensitivity, and adjust the instrument sensitivity accordingly.

A precision 59-kilohm calibration resistor is installed in the 3178 at the factory. The installed resistor can usually be used even though the transducer calibration data mentions some other resistance value. In Section 3 of this manual, the techniques described above are demonstrated. If, however, the installed value of calibration resistor is not appropriate for the transducer and measurement range to be used, the 59-kilohm resistor should be replaced at this time. The calibration resistor is mounted on terminals located at the front edge of the conditioner printed-circuit board. It can be accessed by removing the instrument front panel.

Note: Lebow 1600 Series Rotary Transformer Torque Transducers are supplied with the appropriate calibration resistor integral to the transducer. When this type of transducer is used with the 3178, it is not necessary to remove the 59-kilohm resistor internal to the instrument. The Lebow calibration resistor can be appropriately connected to the 3178 calibration circuit via the transducer cabling. Refer to Figure 4 and the following section.

Transducer Cabling. Cabling to the transducer is accomplished via the supplied instrument I/O connector. The I/O connector pin numbers and functions are given in Figure 4. When Daytronic 400 or 500 Series Transducers are used, factory-wired cables are available as shown in Figure 4. The Daytronic 82S Cable is for use with Lebow 1600 Series Rotary Transformer Torque Transducers. This

cable provides connection from the 3178 calibration circuit to the calibration resistor which is integral to the 1600 Series transducers, without requiring the removal of the 3178 calibration resistor.

When user-fabricated transducer cabling is used, it should take the form of either the 4-, 5-, or 7-wire cable configuration shown in Figure 4. The 4-wire configuration should be used when overall deadweight calibration is the method used and the required cable length is less than 20 feet. The 5-wire configuration should be used when the instrument is to be calibrated by achieving a precisely known Equivalent Input value through the use of a shunt calibration resistor supplied by the transducer manufacturer and when the required cable length is less than 20 feet. The 7-wire configuration should be used with cable lengths longer than 20 feet since the excitation voltage is sensed and regulated at the transducer and optimum shunt calibration can be achieved.

Remote Calibration Check. The instrument can be placed in the calibration mode (positive realm only) by shorting pins 5 (Signal Common) and 8 (Remote Cal) of the rear-panel I/O connector. Figure 4 indicates three methods of remotely entering the calibration mode (external switch, transistor, or TTL source). The Remote Cal function provides a convenient method of periodically monitoring calibration of the instrument in the positive realm.

Master/Slave Connections. When more than one 3178 (or a combination of 3178 or 3130 LVDT Conditioners) is being used in a measurement setup (instruments are continuously mounted or the transducer cabling is in a common conduit or raceway), beat frequencies may be produced from the 3-kHz oscillators used in the instruments to develop the excitation. To prevent beat frequencies from occurring, one unit can be designated the master, and the remaining units can be driven from the oscillator contained in the master unit. The remaining units are designated as slave instruments. To perform master/slave wiring, refer to Figure 4.

Analog Outputs. Two analog outputs are available at the instrument I/O connector, with each output having a different passband: dc to 2 Hz and dc to 400 Hz. The cutoff frequencies are achieved with active low-pass filters. When the dc-to-2 Hz output is used, a trade off is made between noise elimination and increased time-to-answer or slew time. Each output has a 60-dB rolloff a decade from the cutoff frequency. The filter characteristics are given by the following equations.

DAYTRONIC 3X78 INSTRUMENT I/O

CONNECTOR WPIN DESIGNATIONS

(X=1,2,or 3,e.g.3178,3278,3378)

Fig. 4 I/O Wiring Data

A

AMPHENOL 225-21021-103 REARVIEW

PIN PIN
1 +EXCITATION A +SENSE 2 -EXCITATION B -SENSE
9 OUTPUT SHIELD K NC
IO OUTPUT SIGNAL COMMON L NC

3 + SIGNAL INPUT C CALIBRATION SENSE
4 - SIGNAL INPUT D OSC. DISABLE
5 SIGNAL COMMON E TRANSDUCER CABLE SHIELD {LEBOW 1600
6 OSC. INPUT F OSC. OUTPUT
7 LEBOW 1600 CAL. H ANALOG OUTPUT, ±5V-DC TO 2HZ
8 REMOTE CALIBRATION J ANALOG OUTPUT, ±5V—DC TO 400HZ

B

AN 3057-6 AMPHENOL 97-3106A-14S-6S

BENDIX PT02E-10-6S

BURNDY BT06AC-10-6S

D AMPHENOL 97-3106A-14S-5S, AN 3057-6

A

DAYTRONIC 400 SERIES TRANSDUCER CONNECTIONS
80S

+EXC +SENSE -EXC -SENSE +SIG -SIG CAL. SENSE ±5V - DC TO 2HZ ±5V - DC TO 400HZ COMMON

A

DAYTRONIC FACTORY WIRED CABLES
DAYTRONIC 500 SERIES TRANSDUCER CONNECTIONS
81S

graph TD
    A["+EXC"] --> D["D"]
    A --> E["+SENSE"]
    E --> A
    A --> F["-EXC"]
    F --> B["A"]
    B --> G["+SIG"]
    G --> H["B"]
    H --> I["C"]
    I --> J["CAL. SENSE"]
    J --> K["H"]
    J --> L["J"]
    J --> M["I0"]
    J --> N["±5V-DC TO 2HZ"]
    J --> O["±5V-DC TO 400HZ"]
    J --> P["COMMON"]

B

A

LEBOW 1600 SERIES ROTARY

82S

TRANSFORMER TORQUE TRANSDUCER

+EXC -EXC + SENSE - SENSE + SIG - SIG CAL ±5V-DC TO 2HZ ±5V-DC TO 400HZ COMMON SHIELD

D

REMOTE CALIBRATION CONNECTIONS

A B IO COM

See the CORRECTION to Fig. 4 in the front of this manual.
Fig. 4 (cont'd)

MASTER/SLAVE CONNECTION FOR 3X78 INSTRUMENTS MASTER 3X78 SLAVE 3X78 COMMON 10 OTHER SLAVES

graph TD
    A["4 WIRE CONFIGURATION FOR CABLES SHOTTER THAN 20 FEET"] --> B["7 WIRE CONFIGURATION FOR CABLES LOWER THAN 20 FEET"]
    B --> C["+SENSE"]
    B --> D["-EXC"]
    B --> E["+SIZE DC TO 2HZ"]
    B --> F["3V DC TO 400HZ"]
    B --> G["15V DC TO 400HZ"]
    B --> H["6V DC TO 400HZ"]
    B --> I["10V COMMON"]
    B --> J["SHIELD"]
    B --> K["CAL SENSE"]
    B --> L["C"]
    B --> M["B"]
    B --> N["+SIZE DC TO 2HZ"]
    B --> O["3V DC TO 400HZ"]
    B --> P["H"]
    B --> Q["15V DC TO 400HZ"]
    B --> R["4 V COMMON"]
    B --> S["SHIELD"]
    B --> T["CAL SENSE"]
    B --> U["C"]
    B --> V["8"]
    B --> W["+SIZE DC TO 2HZ"]
    B --> X["3 V DC TO 400HZ"]
    B --> Y["6 V COMMON"]
    B --> Z["SHIELD"]
    B --> AA["CAL SENSE"]
    B --> AB["C"]
    B --> AC["+SIZE DC TO 2HZ"]
    B --> AD["3 V DC TO 400HZ"]
    B --> AE["4 V COMMON"]
    B --> AF["SHIELD"]
    B --> AG["CAL SENSE"]
    B --> AH["C"]
    B --> AI["+SIZE DC TO 2HZ"]
    B --> AJ["3 V DC TO 400HZ"]
    B --> AK["6 V COMMON"]
    B --> AL["SHIELD"]
    B --> AM["CAL SENSE"]
    B --> AN["C"]
    B --> AO["+SIZE DC TO 2HZ"]
    B --> AP["3 V DC TO 400HZ"]
    B --> AQ["6 V COMMON"]
    B --> AR["SHIELD"]

Daytronic Corporation

$$ \mathrm{A} _ {\text { out }} @ \mathrm{f} _ {0} = 0. 7 \mathrm{A} _ {\text { in }} $$

$$ \mathrm{A} _ {\text { out }} @ 1 0 \mathrm{f} _ {0} = 0. 0 0 1 \mathrm{A} _ {\text { in }} $$

$$ \mathrm{T} = 1. 4 / \mathrm{f} _ {0} $$

where A_out = output amplitude

$$ \mathrm{A} _ {\text {in}} = \text {input amplitude} $$

$$ \mathrm{f} _ {0} = \text { selected cutoff frequency } $$

T = time-to-answer in seconds (output of filter within 0.1%

of final value after step function is applied).

3. CALIBRATION

This section contains the instructions for calibrating the 3178. Included is a functional description of the instrument front-panel (see Figure 5). To perform calibration, proceed as follows.

(a) Turn power ON by placing the rear-panel slide switch in the ON position. The front-panel indicator should light to indicate the application of ac power. Allow 5 minutes of warmup for stabilization of transducer characteristics.
(b) Set the Fine and Coarse SPAN controls fully clockwise.
(c) With the transducer unloaded, press the NULL button and adjust the C BALANCE control to obtain the minimum (least positive or most negative) output reading. In some instances, an integral digital indicator will be used to display the conditioner output (Model 3278 or 3378). When only the conditioner is supplied (3178), an external indicator must be used to monitor the conditioner output.
(d) Release the NULL button and bring the output reading to zero with the Fine and Coarse R balance controls.
(e) Load the transducer in the positive direction with a convenient dead weight value which is greater than one half of full scale. Then remove the 3178's front panel (one small flat-head screw near each edge) to access both the SYMMETRY and PHASE adjustments. Adjust the PHASE control (the one on the extreme right), until a maximum output value is obtained. Then replace the front panel. (Once set for your transducer, this PHASE ADJUSTMENT step need not be repeated unless a great change in cable length—or capacitance—is required). Adjust the Coarse and Fine SPAN controls until

DAYTRONIC STRAIN GAGE CONDITIONER Model 3178

R and C BALANCE Controls: These controls are used to set the output to zero when the transducer is unloaded.

NULL Pushbutton: This pushbutton is pressed when nulling the transducer bridge with the R and C BALANCE controls. It provides for non-synchronous demodulation of the carrier for balancing purposes. After a minimum reading is obtained on the display device by adjusting the C control, the pushbutton is released and the output is zeroed using the R controls.

SPAN Controls: The Coarse and Fine SPAN controls are used to set the output to the dead weight value when dead weight calibration is used. They can also be used to set the output to the Equivalent Input value when the CAL (+ or -) button is pressed.

CAL Pushbuttons: The + and - CAL pushbuttons provide for shunt calibration in the positive and negative realms, respectively. They are used in conjunction with the SPAN controls to calibrate the instrument. When both positive and negative realm calibration is required, the +CAL button is used in conjunction with the SPAN controls and the -CAL button is used with the internal Symmetry adjustment.

Figure 5. Front-Panel Description

Daytronic Corporation

the output value equals the dead weight value. Remove the dead weight, and then press the +CAL button, noting the indicator reading obtained. In future calibrations, you need only press the +CAL button and adjust the SPAN controls until you obtain the previously recorded dead weight reading.

(f) If the transducer is to be also used in the negative realm, load the transducer in the negative direction with the same dead weight value as used in step (e) and confirm that the dead weight reading obtained is the same as that of step (e). If not, see steps (g) thru (i).
(g) An internal Symmetry adjustment is provided to compensate for transducers that do not have symmetrical sensitivity characteristics. This adjustment is factory set assuming symmetrical characteristics. If step (f) indicates that a field adjustment is necessary, proceed as follows.
(h) Remove the front panel by removing the two 2-56 flat-head screws to obtain access to the Symmetry adjustment.
(i) With the transducer loaded as in step (f), adjust the Symmetry control (just to the right of the -CAL button) to obtain a dead weight reading equal to that obtained in step (e).
(j) If dead weight calibration is not practical and the transducer manufacturer has supplied a calibration resistor (or resistor value), install the recommended calibration resistor.
(k) Repeat steps (b) thru (d). Now press the +CAL button and adjust the SPAN controls until the instrument output is equal to the Equivalent Input value simulated by the installed resistor.
(1) If a negative Equivalent Input value is also provided (as in the case of Lebow 1600 Series transducers), press the -CAL pushbutton and confirm that the negative value can also be obtained with the same setting of the Coarse and Fine SPAN controls. If not, adjust the Symmetry control to obtain the negative Equivalent Input value.
(m) If dead weight calibration is not practical and the transducer calibration data is unknown, the Equivalent Input value for the factory-installed calibration resistor can be approximated as follows, assuming that the mv/v sensitivity rating of the transducer and the bridge resistance are known.

$$ \mathrm{X} = \frac {2 5 0 0 0 \mathrm{R} _ {\mathrm{b}}}{\mathrm{KR} _ {\mathrm{c}}} $$

where X = Equivalent Input, % of full scale

R_b = bridge resistance, ohms

K = transducer sensitivity, mv/v full scale

R_c = calibration resistance,ohms (59 K installed)

Sample Calculation: Assume that K = 3.000 mv/v for a 5000-pound load cell (fullscale) with a bridge resistance of 350 ohms.

$$ \mathrm{X} = \frac {25000 \times 350}{59000 \times 3} = 49.4 \% \text { of full scale } = 2472 \text { pounds } $$

4. BLOCK DIAGRAM DESCRIPTION

The purpose of this section is to explain how the Model 3178 works by using a simplified block diagram. This section is not intended to provide a detailed explanation of electronic circuits for personnel untrained in electronic technology. However, it provides an adequate overview of operation for those familiar with basic electronic circuit operation. Throughout the following, refer to Figure 6.

Power Supplies. Primary power (115 volts ac, 50-400 Hz) is applied to the instrument by means of a rear-panel ac connection point and the supplied 3-conductor power cord. A rear-panel slide switch is used to turn ON primary power. Overload protection is provided by a 0.25 ampere fuse mounted near the ac connection point. When the slide switch is ON, primary power is applied to the power transformer which provides the necessary power-line isolation and the low ac voltages required to develop the regulated dc voltages used in the 3178. The secondary of the power transformer has a grounded center tap, and a Diode Bridge functions as two full-wave rectifiers to produce ±9 volts regulated dc. Two three-terminal integrated-circuit Regulators are used to develop these regulated voltages. The reference terminal of each Regulator is biased with one or two diodes to make certain that a minimum regulated voltage of 9 volts is achieved. The proper diode biasing is accomplished at factory check out.

A dc reference voltage of +2.5 volts dc is further developed from regulated +9 volts by the use of a third three-terminal Regulator. This precision dc reference is used to control the amplitude of the ac excitation signal and is further discussed in a following paragraph.

Daytronic Corporation

The -9 volts regulated is used to light the front panel indicator (LED) which indicates the application of ac power to the instrument.

The + unregulated voltage from the diode bridge is routed to the Digital Indicator and HI/LO Limits circuit boards when these items are supplied (Models 3278 and 3378). It is used to develop +5 volts regulated for the TTL logic employed in these circuits. Refer to the Digital Indicator and HI/LO Limits Instruction Manuals.

The secondary of the power transformer also supplies 5 volts ac to the Digital Indicator circuit board when the Model 3278/3378 is supplied. This ac voltage is used to develop unregulated +6 volts. Refer to the Digital Indicator Instruction Manual.

AC Excitation. The 3.28 kHz ac excitation is produced with a Wein Bridge Oscillator. The oscillator output is applied to a full-wave rectifier to obtain a dc voltage proportional to the ac amplitude of the oscillator output. The rectifier output is applied to the inverting input of an Integrating Amplifier. The non-inverting input of the amplifier is connected to the precision Reference voltage (+2.5 volts dc). If the amplitude of the oscillator varies, the output of the Integrating Amplifier changes the resistance of an Automatic Gain Control element (FET) to return the oscillator amplitude to its nominal value of 2 volts ac. The Integrating Amplifier thus serves as an error amplifier, and the integrating element (capacitor) deletes 60-Hz ripple.

A pair of operational amplifiers is used as a phase splitter to eliminate the ground reference of the oscillator signal so that the transducer bridge is floating. This reduces signal-carrier common-mode voltages to a negligible value. Both plus and minus Sense wires are returned from the transducer bridge to the instrument to sense and regulate the excitation voltage at the transducer (Figure 6 shows the 3178 connected to the transducer via a 7-wire cable. Refer to Figure 4). Excitation Phase and Amplitude balance controls are connected across the Sense lines. A pair of Power Drivers is used to provide the 80 milliamperes of drive current required by the transducer bridge.

When more than one 3178 (or a combination of 3178 or 3130 LVDT Conditioners) is being used in a measurement setup, beat frequencies may be produced from the 3-kHz oscillators contained in each instrument. To prevent beat frequencies from occurring, one unit can be designated the master, and the remaining units can be driven from the oscillator contained in the master unit. The remaining units are

designated as slave instruments. The Oscillator In terminal of each slave unit (at the instrument I/O connector) provides a connection point to the Oscillator Out terminal of the master unit. The Oscillator Out and Oscillator Disable terminals of the slave units are jumpered to disable the oscillator internal to these units.

Calibration Circuit. A Cal Sense line is returned from the +Signal connection at the transducer to provide for shunting the Cal Resistor across a bridge leg to simulate an Equivalent Input. When the +CAL button is pressed, the Cal Resistor is shunted across the +Signal and +Sense connections. This action occurs by grounding the negative input of a Comparator through the +CAL switch. The Comparator output then closes an analog switch to which the Cal Resistor is connected. The connection to the +Sense line is then made through normally-closed contacts of the -CAL switch. Similarly, when the -CAL button is pressed, the Cal Resistor is shunted across the +Signal and -Sense connections. The Comparator is exercised as when the +CAL button is pressed, and the Cal Resistor is switched to the -Sense line through the normally-open contacts of the -CAL switch.

Calibration in the positive realm can also be remotely checked. When the Remote Cal input at the 3178 I/O connector is brought to a zero-volt (ground) level through the action of an external switch, transistor driver, etc., the same action occurs as when the +CAL button is pressed.

A line from the Cal Resistor is also provided for use with Lebow 1600 Series rotary transformer torque transducers. This type of transducer has an integral Cal Resistor installed by the manufacturer. The line provided from the Daytronic Cal Resistor enables the use of the Lebow Cal Resistor without removing the resistor integral to the 3178.

Signal Conditioner. The +Signal and -Signal inputs from the transducer are applied to a differential ac signal amplifier with excellent common-mode rejection. Summed into the amplifier are the appropriate resistive and capacitive nulling voltages from the R and C BALANCE controls. These enable the operator to set the 3178 output to zero under transducer no load conditions.

A high-pass filter/amplifier follows the input differential amplifier to provide the required gain and eliminate 60-Hz ripple or noise related to the rotational frequency of the device when a rotating transformer torque transducer is used. The Coarse SPAN control is situated at the output of the amplifier to provide a gain control.

graph TD
    A["Power Source"] --> B["Regulator"]
    B --> C["Comparator"]
    C --> D["Signal Processing"]
    D --> E["Amplifier"]
    E --> F["Amplifier via OR/INT"]
    F --> G["Amplifier via Power"]
    G --> H["Amplifier via Control"]
    H --> I["Amplifier via Power"]
    I --> J["Amplifier via Control"]
    J --> K["Amplifier via Power"]
    K --> L["Amplifier via Control"]
    L --> M["Amplifier via Power"]
    M --> N["Amplifier via Control"]
    N --> O["Amplifier via Power"]
    O --> P["Amplifier via Control"]
    P --> Q["Amplifier via Power"]
    Q --> R["Amplifier via Control"]
    R --> S["Amplifier via Power"]
    S --> T["Amplifier via Control"]
    T --> U["Amplifier via Power"]
    U --> V["Amplifier via Control"]
    V --> W["Amplifier via Power"]
    W --> X["Amplifier via Control"]
    X --> Y["Amplifier via Power"]
    Y --> Z["Amplifier via Control"]
    Z --> AA["Amplifier via Power"]
    AA --> AB["Amplifier via Control"]
    AB --> AC["Amplifier via Power"]
    AC --> AD["Amplifier via Control"]
    AD --> AE["Amplifier via Power"]
    AE --> AF["Amplifier via Control"]
    AF --> AG["Amplifier via Power"]
    AG --> AH["Amplifier via Control"]
    AH --> AI["Amplifier via Power"]
    AI --> AJ["Amplifier via Control"]
    AJ --> AK["Amplifier via Power"]
    AK --> AL["Amplifier via Control"]
    AL --> AM["Amplifier via Power"]
    AM --> AN["Amplifier via Control"]
    AN --> AO["Amplifier via Power"]
    AO --> AP["Amplifier via Control"]
    AP --> AQ["Amplifier via Power"]
    AQ --> AR["Amplifier via Control"]
    AR --> AS["Amplifier via Power"]
    AS --> AT["Amplifier via Control"]
    AT --> AU["Amplifier via Power"]
    AU --> AV["Amplifier via Control"]

Daytronic Corporation

The signal is next applied to a phase-sensitive demodulator (active full-wave rectifier). The amplified ac signal is synchronously demodulated to restore the information content of the signal; that is, the amplitude and direction of the applied force. The NULL pushbutton and associated circuit provide nonsynchronous demodulation for balancing of the transducer bridge under no load conditions.

The dc output of the demodulator is buffered by an output amplifier which contains the Fine SPAN adjustment and a Symmetry circuit. The Symmetry circuit and its associated adjustment provide for compensating transducers with non-symmetrical positive and negative characteristics.

The amplified analog signal is applied to two active low-pass filters, each of which provide an output at the instrument I/O connector. The two outputs provide passbands of dc to 2 Hz and dc to 400 Hz. Output selection is a trade off between eliminating unwanted signals caused by vibration, etc., or increasing the time-to-answer (slew rate) of the conditioner. The rolloff of each output is 60 dB within a decade of the cutoff frequency.

5. VERIFICATION OF NORMAL OPERATION

It is the purpose of this section to aid the user in determining, in the event of a malfunction to which the Model 3178 is suspected of contributing, whether the instrument is functioning normally or whether it is the source of the observed trouble. In the event the unit requires repair, a complete parts list, schematic diagram, and component location drawing are included in this manual. The user may also contact the factory Service Department or the local Daytronic Representative for assistance.

If the instrument is suspected of faulty operation, observe the following steps.

(a) If the unit is totally inoperational (front-panel power indicator does not light), check the primary power fuse (Fl) located on the standup board which forms the power cord connection point. If the fuse is blown, replace it with a 0.50 ampere fuse (see Table 2 for part number). Before reapplying power, visually inspect the power cord and the input power connections for any discrepancy which could have caused the overload.

(b) If the transducer has some preloading, the BALANCE controls may not allow successful zeroing of the instrument output. This condition can be remedied by connecting a resistor (50 K-200 K range, metal-film type)

from the +Signal terminal of the transducer to the + or -Excitation terminals. The Excitation terminal to which the connection is made is determined by the direction of the loading or off-zero reading.

(c) The inability to balance correctly where the instrument output reads totally off scale and the BALANCE controls have no authority can very likely be the result of a damaged or defective transducer or cable. This possibility can be confirmed (or eliminated) by substituting a transducer and cable known to be in good condition or by simulating a balanced transducer, using either a commercially available transducer simulator or the simple star bridge arrangement shown in Figure 7. The star bridge simulates a conventional four-arm bridge in an exact condition of balance. To construct a star bridge connect four 10% carbon resistors as shown in Figure 7. Use 180-ohm resistors to simulate a 350-ohm bridge and use 56-ohm resistors to simulate a 120-ohm bridge. Neither the resistor values nor temperature characteristics are critical since the balance condition of a star bridge is not determined by the resistance

USE JUMPER WIRE TO CONNECT 4 RESISTORS MODULE I/O CONNECTOR 1 +EXC A +SENSE - SIG 2 -EXC B -SENSE 3 +SIG C CAL SENSE

Figure 7. Star Bridge Construction

Daytronic Corporation

values. Solder two resistors together, then solder the remaining two resistors together. Next, connect the two junctions together using a separate wire as shown. There is a good reason for this method of construction, and it should be followed. Connect the substitute or simulated transducer to the instrument I/O connector using a short 4-wire cable configuration as shown in Figure 4. Attempt to balance the substitute or simulated transducer. If conditions now appear to be normal, the transducer or cable is at fault. If the previous difficulties persist, the 3178 is faulty.

MODEL

3200 / 3300

DIGITAL INDICATOR

INSTRUCTION MANUAL

-187135 -18235 +1915 +2.145 [phone] -9925

3000
Instrument Series

MODEL

3200 / 3300

DIGITAL INDICATOR

INSTRUCTION MANUAL

Daytronic Corporation

TABLE OF CONTENTS

Section Page

1 Description 1
2 Installation 4
3 Operation 7
4 Block Diagram Description 8
5 Verification of Normal Operation 15

LIST OF ILLUSTRATIONS

Figure Page

1 3000 Series Instrument with Digital Indicator .... 1
2 Full-Scale Displays for Three Ranges 6
3 Scale, Decimal Point, Dummy Zero Switches 7
4 A/D Converter Timing Diagram 10
5 Block Diagram Description 13

LIST OF TABLES

Table Page

1 3000 Series Model Numbering 2
2 Specifications 4

PLEASE NOTE: Sections 6 and 7, Figures 6 and 7, and Table 3 have been removed from this manual.

If you need information regarding specific 3200/3300 components and circuitry, please contact the Daytronic Service Department at [phone].

INSTRUCTION MANUAL 3200/3300 SERIES DIGITAL INDICATOR

1. DESCRIPTION

The 3000 Instrument Series is a family of premium signal conditioning instruments that includes models to accommodate virtually all types of transducers and signal sources commonly encountered in electro-mechanical testing and control operations. The 3000 Instruments are available in three forms: Form 1 contains the Signal Conditioner only; Form 2 is the Signal Conditioner with Digital Indicator; Form 3 is the Signal Conditioner with Digital Indicator and Hi-Lo Limits. The Model numbering system used with the 3000 Series identifies the form and the type of signal source. This numbering system is further explained in Table 1. From Table 1, it can be seen that all models having a Digital Indicator are identified by a 32XX or 33XX number, with the last two digits identifying the type of signal source (thermocouple, LVDT, etc).

+ 4985 pound-feet NULL — BALANCE — +CAL SPAN — CAL OZYTRONIC STRAIN GAGE CONDITIONER/INDICATOR Model 3278

Figure 1. 3000 Series Instrument with Digital Indicator

Table 1. 3000 Series Model Numbering

"3" is series identifier, used with all units: Second digit identifies "form": "1" = signal conditioner only "2" = signal conditioner with digital indicator "3" = signal conditioner with digital indicator and Hi-Lo limits Third and fourth digits identify type of signal source: "10" = Type J Thermocouple "11" = Type K Thermocouple "15" = Thermistors "30" = LVDT's "40" = Pulse Pick-up's (Frequency) "63" = DC Volts/Millivolts/ DC-DC LVDT's/Potentiometers "70" = Strain Gages (DC excited) "78" = Strain Gages (AC excited) Etc. Model 3 X X X

The 3000 Series instruction manual system is designed to provide the user with the following documentation: (1) a separate instruction manual for each type of Signal Conditioner purchased; (2) an instruction manual covering only the Digital Indicator section of a 3000 Series instrument, but applicable to any Form 2 or Form 3 instruments; and (3) an instruction manual covering only the Hi-Lo Limit section

of a 3000 Series instrument, but applicable to any Form 3 instrument. It is the purpose of this manual to cover the Digital Indicator section of all Form 2 and Form 3 instruments.

The Digital Indicator section of any Form 2 or Form 3 instrument consists of a printed-circuit board on which are mounted the required circuit components for digitizing the analog output of the Signal Conditioner and the light-emitting-diode (LED) display. This board is mounted above the circuit board which contains the components for the Signal Conditioner. The digits which comprise the display are mounted on a small board which is affixed to the digitizer board with a right-angle printed-circuit board header. The Form 3 instruments contain an additional printed-circuit board for the Hi-Lo Limit circuitry.

The LED display is comprised of six orange digits with polarity sign. The 0.4 inch height of the digits, combined with the inherent brilliance of an LED type of display, make the display easily discernible in normal room lighting. The display is viewed through the red plastic front panel of the instrument to provide filtering of external light and enhance the display brilliance. The front panel is opaque except for that portion through which the display is viewed. A typical 3000 Instrument with Digital Indicator is shown in Figure 1.

The Digital Indicator scaling is selected with rear-panel pushbutton switches. Full-scale values of ±5000 counted by 1's, ±10000 counted by 2's, or ±20000 counted by 5's can be selected. The most significant digit (MSD) of the display contains the polarity sign and is either unlit or lights as a 1 for displays of 10000 or greater. The least significant digit (LSD) is a dummy zero which can be turned ON or left unlit as desired. In addition, decimal-point position can be selected to give display readings as follows: 1.XXXX, IX.XXX, 1XX.XX, 1XXX.X, or 1XXXX (no decimal point). Decimal-point location and dummy zero selection are also accomplished with rear-panel switches (miniature slide-switch bank). When the 20000 scale is selected, the display is digitally limited to read a maximum number of 19995 since the MSD is either unlit or reads a "1" for displays of 10000 or greater. The 5000 and 10000 scales are analog limited to an overrange of approximately 5600 and 11200, respectively. An overrange condition on any range is indicated by a flashing display. The sampling rate of the display is 3 samples per second. The Digital Indicator specifications are summarized in Table 2.

Table 2. Specifications

Display: Orange LED's, six digits with polarity sign, 0.4 inch height. MDS is either unlit or reads a 1 and contains the polarity sign. LSD is a dummy zero which can be programmed to be lit or unlit (rear-panel switch).

Scaling: Selectable at rear panel; full-scale values of ±5000 counted by 1's, ±10000 counted by 2's, or ±20000 counted by 5's.

Decimal Point: Decimal-point location can be selected with rear-panel switches as follows: 1.XXXX, 1X.XXX, 1XX.XX, 1XXX.X, or 1XXXX (no decimal point).

Sampling Rate: 3 samples per second.

Legends: Each instrument supplied with an appropriate assortment of user-installable rub-on engineering unit legends.

2. INSTALLATION

The 3000 Series Instruments can be operated as bench-top instruments or they can be rack- or panel-mounted. Dimensions for all three types of mounting and corresponding mounting instructions are given in the accompanying Signal Conditioner Instruction Manual. The following paragraphs provide the instructions for legend installation, scale selection, decimal point/dummy zero selection, and ac power connection.

Legend Installation. A sheet of dry-transfer lettering is supplied with each instrument to provide the user with a means of affixing an engineering-unit legend to the front panel. The sheet contains the common engineering units encountered in making electro-mechanical measurements and additional alpha-numeric characters. Space is supplied on the front panel to affix the desired legend to the right of the display. To affix the legend to the front panel, press the dry-transfer sheet firmly

Daytronic Corporation

against the panel with the desired legend or character situated in place. Rubbing the legend or character with a ball-point pen will cause the legend to be transferred onto the panel. The legend can be protected from scratches which may occur during calibration/operation of the instrument by lightly spraying it with Krylon #1306 Workable Fixative.

If it is desired to change a legend, remove the legend to be replaced by pressing masking tape against the legend, then pulling off the gummed tape.

Scale Selection. Figure 2 shows the full-scale display for the three selectable scales: ±5000 counted by 1's, ±10000 counted by 2's, and ±20000 counted by 5's. The figure also indicates the last active digit and the dummy zero which can be lit for any scale selection. The first digit of the display contains the polarity sign and lights as 1 on the 10000 and 20000 scales for values equal to or greater than 10000. On the 20000 range, because the most significant digit is either unlit or a 1 and the count is by 5's, the greatest number which can be displayed is 19995. Of course, this would be displayed as 199950 if the dummy zero were lit.

Scale selection is accomplished with the two pushbutton switches located at the rear panel. The panel is marked to indicate which switches are pushed IN or left OUT for the corresponding scale selection. The switches have a push-push action and are illustrated, with the scale selection coding, in Figure 3. With both switches OUT, the ±5000 range is selected. With the left switch OUT and the right switch IN, the ±10000 range is selected. With the left switch IN and the right switch OUT, the ±20000 range is selected.

Decimal Point/Dummy Zero Selection. Decimal-point location and dummy-zero activation are selected with a rear-panel miniature slide switch bank. The switch bank is marked on the rear panel as shown in Figure 3. The decimal-point position can be fixed at any one of the display locations indicated on Figure 3. Place any one of slide switches 1 through 4 ON to light the decimal point at the desired location. Place slide switch 5 ON if no decimal point is to be lit. To activate the dummy zero (digit to the right of last active digit will continuously light as a zero), place slide switch 6 ON.

AC Power Connection. To protect operating personnel, the 3000 Series Instruments are equipped with a three-conductor power cord. When the cord is plugged into the appropriate receptacle, the instrument is grounded. The offset pin on the

"3000" Digital Indicator

Figure 2. Full-Scale Displays for Three Ranges

Daytronic Corporation

power cord is ground. To maintain the safety ground when operating the instrument from a two-contact outlet, use a three-prong to two-prong adaptor and connect the green pigtail on the adaptor to ground.

To prepare the instrument for operation, connect the power cable to a 105-135 volt ac, 50-400 Hz power source. The instrument can use up to 5 watts of power.

3. OPERATION

The only operation required is turning ON/OFF ac power to the instrument. This is accomplished with the rear-panel slide switch (see Figure 3). The display lights immediately when ac power is ON.

NOTE

In all instances, a flashing display indicates that an overrange condition has occurred, and it is likely that the Signal Conditioner amplifiers are being overdriven. The 5000 and 10000 ranges are analog limited at approximately 5600 and 11200, and while a number may be displayed, if

5000 10000 20000 1.X.X.X.X 0 O 1 2 3 4 5 6 N ON

Figure 3. Scale, Decimal Point, Dummy Zero Switches

"3000" Digital Indicator

the display is flashing an overrange condition has occurred. Consequently, the displayed value may be invalid. The 20000 range is digitally limited to 19995. When an overrange occurs on this range, the display will flash all zeros.

4. BLOCK DIAGRAM DESCRIPTION

The purpose of this section is to explain how the Digital Indicator works by using a simplified block diagram. This section is not intended to provide a detailed explanation of electronic circuits for personnel untrained in electronic technology. However, it provides an adequate overview of operation for those familiar with basic electronic circuit operation. Throughout the following, refer to Figure 5.

Power Supplies. The integrated-circuit chips which comprise the A/D Converter and the Overrange Comparator are CMOS circuits which require ±9 volts regulated. These voltages are supplied from power supplies contained on the Signal Conditioner circuit board and are discussed in the Signal Conditioner Instruction Manual.

The digital part of the A/D Converter, the Bit Selector, and the various logic gates and inverters are operated from +5 volts regulated (TTL logic). The +5 volt supply consists of a three-terminal Regulator. The unregulated input to the Regulator is obtained from Signal Conditioner circuit board (unregulated side of +9 volt supply).

The BCD-to-7-Segment, Decoder, Display Drivers, and Display LED's operate from +6 volts unregulated. Five volts ac is supplied from the Signal Conditioner circuit board (secondary of power transformer located on board). Plus 6 volts unregulated is developed with a Diode Bridge and Filter located on the Digital Indicator board.

A +2.5 volts precision reference is supplied from a precision power supply located on the Signal Conditioner circuit board. This reference is used in the A/D Converter for digitizing the analog input signal.

A/D Converter. The A/D Converter is a dual-slope converter which digitizes the analog input signal using a ratiometric integrating technique. The analog signal input, a reference input, and a clock input are applied to the converter. The measurement cycle is divided into an Auto-Zero cycle, a Signal Integrate cycle, and

a Reference Integrate cycle. Each cycle has a time base in which a certain amount of clock pulses occur. The clock used is a 100-kHz crystal oscillator. The Auto-Zero cycle is used to bring the output of the integrator to zero and lasts 10,000 counts. The next cycle is the Signal Integrate cycle which also lasts 10,000 counts. If the analog input is zero at the start of the Signal Integrate cycle, the integrator will see the same voltage that existed in the previous state. Thus, the integrator output will not change but will remain stationary during the entire Signal Integrate cycle. If the analog input is not equal to zero, an unbalanced condition exists compared to the Auto-Zero cycle and the integrator will generate a ramp whose slope is proportional to the analog input. At the end of this cycle, the sign of the ramp is determined. If the input signal was positive, a voltage which is VREF more negative than during Auto-Zero is applied to the integrator input. The A/D Converter chip generates the equivalent of a +Reference or -Reference from the single +Reference applied. The reference voltage returns the output of the integrator to zero. The time, or number of counts, required to do this is proportional to the input voltage. The Reference Integrate cycle can be a maximum of 20,000 counts. The full measurement cycle is then a maximum of 40,000 counts, with the answer to the measurement being achieved when the reference voltage returns the integrator output to zero. The full measurement cycle is shown in Figure 4.

The DIGIT DRIVES are positive-going signals that last for 200 clock pulses (see Figure 4). The scan sequence is D5 (MSD), D4, D3, D2, and D1 (last active digit). The scan is continuous unless an overrange occurs. Then all DIGIT DRIVES are blanked from the end of the first scan until the beginning of the Reference Integrate cycle when D5 will start the scan again. This gives a blinking or flashing display as a visual indication of overrange. Because the Digital Indicator has 5000 and 10000 ranges as well as a 20000 range, an analog Overrange Comparator is used as well as the inherent overrange capability of the A/D Converter. The Overrange Comparator is described in a following paragraph.

The binary-coded-decimal (BCD) outputs of the A/D Converter are positive logic signals that go on simultaneously with the DIGIT DRIVE. Since the DIGIT DRIVES are blanked for an overrange on the 20000 scale, the display will flash all zeros when this condition occurs on this scale.

Input Attenuators/Range Switches. The 5-volt analog signal input (full scale) and the 2.5 volt reference from the Signal Conditioner are applied to attenuator networks where 2-volt and 1-volt signal and reference inputs are developed for the A/D Converter. Since, on the 20000 range, the Reference Integrate cycle can be

"3000" Digital Indicator

Figure 4. A/D Converter Timing Diagram

twice as long as the Signal Integrate cycle, the analog input voltage required to give a full-scale reading is exactly equal to 2 VREF. Consequently, on the 20000 range, the VREF is 1 volt and the VSIG is 2 volts for full scale. On the 10000 range, the two cycles can be equal; thus, VSIG = VREF = 2 volts. On the 5000 range, the analog voltage for a full-scale reading is then equal to 1/2 VREF; thus, VREF must be 2 volts and VSIG 1 volt. The appropriate levels are switched to the A/D Converter through the rear-panel Range switches.

Bit Selector/Decoding Logic. The Bit Selector transfers one of two sets of 4-line BCD data applied at input ports to output ports upon receiving a command at the A SELECT or B SELECT port. When the A SELECT port is high, the X input data is transferred to the Z output ports. Conversely, when the B SELECT input is high, the Y input data is transferred to the Z output ports. The Y data is obtained directly from the BCD output ports of the A/D Converter. The X data is comprised of specially coded bits used to count by 2's or 5's when the 10000 or 20000 ranges are selected, respectively. On the 5000 range, the A SELECT input is held low through the Range switches and the B SELECT input is high. The Y data is transferred to the output of the Bit Selector and the display count is by 1's. On the 10000 range, the A SELECT input is held low except when the Dl DIGIT DRIVE is high. When D1 is high, the A SELECT is high and the B SELECT is low, transferring the X data to the Z ports of the Bit Selector and allowing the display to count by 2's. Operation on the 20000 range is identical except that the bit coding is arranged to give a count by 5's with the X data.

Display Coding/Driving. The display is a 4.5-digit LED display with polarity and a dummy zero. DS2 through DS6 are 7-segment displays with common cathodes. The Bit Selector output ports are connected as inputs to a BCD-to-7-Segment Decoder. The 7 outputs of the decoder are connected as inputs to the segments (anodes) of DS2 through DS6. The DIGIT DRIVES of the A/D Converter are used to sequentially turn on DS2 through DS6 through Display Drivers which sink current. DS1 is either unlit or lights as a 1 for displays of 10000 or greater. Unlike DS2 through DS6, DS1 is a common anode device. The DS1 segments (cathodes) are sinked via a display driver from the 1 bit of the A/D Converter. The DS1 anode is then brought high by D5 through a driver comprised of an inverter and a transistor which applies +6 volts unregulated to the anode when D5 is high.

The last digit of the Display (DS6) is the dummy zero digit. When the Dummy Zero Select switch is ON, the DS6 cathode is sinked when D5 is high. The outputs of the BCD-to-7-Segment Decoder are tied to the DS6 segments. Also, when D5 is

"3000" Digital Indicator

high, the B SELECT input to the Bit Selector is pulled low through the NOR gate connected to the port. The A SELECT input is also low since it is either held hard low through the Range switches on the 5000 range or it is connected to D1 through the Range switches on the 10000 and 20000 ranges (when D5 is high D1 must be low). With the A SELECT and B SELECT inputs both low, the Z ports of the Bit Selector assume the low state no matter what the X and Y input data reads. Consequently, each time D5 is high, DS6 displays a zero.

The polarity sign is also part of DS1. The minus (-) segment is always lit through 6 volts and an external resistor tied to circuit common. When the A / D Converter senses a positive polarity, the POLARITY port goes high. This action drives an inverter low to light the vertical portion of the polarity sign.

Decimal point position is selected with rear-panel slide switches (as is dummy zero selection). Only one of the Decimal slide switches is turned ON at any one time. The decimal-point LED for DS1 is hard wired to +6 volts. Turning ON the associated Decimal switch connects an external resistor and circuit common to the other side of the decimal-point LED. Since the remaining digits with decimal-point LED's (DS2 through DS4) are common cathodes devices, each LED is sinked when the corresponding DIGIT DRIVE is high and associated Decimal switch is ON, applying +6 volts to the other side of the LED through an external resistor.

Analog Overrange. Digital overrange for the 20000 range is inherent in the A/D Converter chip and has been previously described. However, for the 5000 and 10000 ranges, an analog overrange circuit is required. The Overrange Comparator is dc biased with equal resistors returned to the ±9 volt supplies so that its output is at approximately 4.5 volts. Both of the comparator inputs are connected through diodes to the analog input from the Signal Conditioner. When the analog input is one diode drop above or below the comparator biasing, an overrange condition exists since approximately 5.2 volts is present at the analog input (5 volts = full-scale value). The output of the Overrange Comparator goes low when either of the input diodes is forward biased. The comparator output and the BUSY output of the A/D Converter are gated through an OR gate. The BUSY signal is high during the Signal and Reference Integrate cycles of the A/D Converter, then it goes low. This causes the output of the OR gate to go low. The BLANK port of the BCD-to-7-Segment Decoder is normally held high through an external resistor. When the OR gate output goes low, the BLANK port is pulled low through a diode, causing DS2 through DS6 to flash. Since DS1 is not driven from the decoder, a second diode and resistor are used to pull the A/D Converter 1-bit output low when the overrange OR gate is low. This action causes DS1 to flash.

Figure 5. Block Diagram

graph TD
    A["Signal Attenuator"] -->|+2.5 VOLT REFERENCE INPUT| B["REFERENCE ATTENUATOR"]
    B -->|+2.5 VOLT REFERENCE INPUT| C["RANGE SWITCHES"]
    C -->|+2.5 VOLT REFERENCE INPUT| D["A/D CONVERTER DIGIT DRIVES"]
    D --> E["BCD TO-7-SEGMENT DECODER"]
    E --> F["DISPLAY DRIVERS"]
    F --> G["DS1 ANODE"]
    F --> H["DS2-DS6 SEGMENTS (ANODES)"]
    F --> I["DS3-DS4"]
    F --> J["DS5-DS6"]
    F --> K["DS1-DS2-DS3-DS4-DS5-DS6"]
    L["DIVISION RELATION"] --> M["DIODE BRIDGE"]
    M --> N["FILTER"]
    N --> O["+9 VOLTS UNREG"]
    P["OUTRANGE COMPARATOR"] --> Q["DISPLAY FLASHES WHEN LOW"]
    R["UNREGULATED"] --> S["+9 VOLTS REG"]
    T["REFERENCE"] --> U["1-VOLT REFERENCE"]
    V["0-VOLT"] --> W["-9 V"]
    X["+0 V"] --> Y["+2.5 VOLT REFERENCE INPUT"]
    Z["±5 VOLT ANALOG INPUT"] --> AA["SIGNAL ATTENUATOR"]
    AB["+2.5 VOLT REFERENCE INPUT"] --> AC["REFERENCE ATTENUATOR"]
    AD["100-KHZ CLOCK"] --> AE["CLOCK IN"]
    AF["DUMMY ZERO SELECT"] --> AG["DUMMY ZERO SELECT"]
    AH["Polarity"] --> AI["BIT SELECTOR"]
    AJ["SET"] --> AK["Bit Selector"]
    AL["ACK"] --> AM["Clock In"]
    AN["Polarity"] --> AO["Bit Selector"]
    AP["SET"] --> AQ["Bit Selector"]
    AR["Polarity"] --> AS["Bit Selector"]
    AT["Polarity"] --> AU["Bit Selector"]
    AV["Polarity"] --> AW["Bit Selector"]
    AX["Polarity"] --> AY["Bit Selector"]
    AZ["Polarity"] --> BA["Bit Selector"]
    BB["Polarity"] --> BC["Bit Selector"]
    BD["Polarity"] --> BE["Bit Selector"]
    BF["Polarity"] --> BG["Bit Selector"]
    BH["Polarity"] --> BI["Bit Selector"]
    BJ["Polarity"] --> BK["Bit Selector"]
    BL["Polarity"] --> BLA["Bit Selector"]
    BN["Polarity"] --> BO["Bit Selector"]
    BP["Polarity"] --> BPB["Bit Selector"]
    BPQ["Polarity"] --> BPQB["Bit Selector"]
    BPQP["Polarity"] --> BPQPQ["Bit Selector"]
    BPQPQ --> BPQPQQ["Bit Selector"]
    BPQPQQ --> BPQPQQQ["Bit Selector"]
    BPQPQQQ --> BPQPQQQ["Bit Selector"]
    BPQPQQQ --> BPQZPQ
    BPQZPQQ --> BPQZPQ
    BPQZPQQ --> BPQZPQ

5. VERIFICATION OF NORMAL OPERATION

It is the purpose of this section to aid the user in rapidly determining whether the Digital Indicator is functioning normally or whether it is the source of the observed trouble. In the event a repair to the Digital Indicator is required, a complete parts list, schematic diagram, and component location drawing are included in this manual. The user may also contact the factory Service Department or the local Daytronic Representative for assistance.

One of the two techniques can be used to rapidly determine whether the Digital Indicator is malfunctioning or whether the problem is in the Signal Conditioner, transducer, or transducer cabling. If the unit is a Form 2 instrument (no Hi-Lo Limits), attempt to zero and calibrate the Signal Conditioner while observing the Signal Conditioner analog output (use the dc-to-2Hz output) on a dc coupled oscilloscope. If the Digital Indicator is unstable or reads erratically, but the oscilloscope indicates a stable analog output from the Signal Conditioner, the problem is likely in the Digital Indicator. In the event the Signal Conditioner output is unstable or noisy, consult the Signal Conditioner Instruction Manual for the proper action to be taken.

If the instrument is a Form 3 type, push one of the Limit pushbuttons and observe how the limit value is displayed on the Digital Indicator. If the display is stable with the Limit button pressed, but is unstable when the button is released, the problem is in the Signal Conditioner, transducer, or transducer cabling. If the display is unstable or erratic whether the button is pressed or released, the problem is in the Digital Indicator.

3000 SERIES

"C" Option

4-20 mA CURRENT OUTPUT

INSTRUCTION MANUAL

1. General Description

Operating in this mode, any 3000 Series instrument can transmit high-accuracy measurement data as process signals for supervisory monitoring and control. ^1 Each “C” unit produces two kinds of analog output simultaneously: (1) its normal voltage output and (2) a current output continuously proportional to the voltage signal to within ±0.05% .

As normally shipped, this option generates a current output within the ISA standard signal range of 4 to 20 mA, corresponding to a range of 0 to +5 V. Bipolar ranges of ±16 mA and 4 to 12 to 20 mA are also available, each corresponding to -5 to +5 V. Voltage compliance is +5 V relative to Signal Common.

Pinout for I/O Connectors (REAR VIEW)

Fig. 1 Rear-Panel Location of 3000C Current Output Board

3000 "C Option" Board I/O Connector (20-pin)² Pin 1 Pin 10 Pin A Pin L Conditioner Board I/O Connector (20-pin)

2. Connections / Output Mode Selection

Pin assignments for the 3000C board's 20-pin I/O connector (shown in Fig. 1) are given in the following table. ^3

Pin Number Function

8 CURRENT OUTPUT SIGNAL

Range will be standard unipolar 4-20 mA if Pins 9 and 10 are both unconnected; the output is single-ended, and should be returned to Pin J (COMMON)

9 ±16 mA MODE

Connecting Pin 9 to Pin K will set the current output range to bipolar ±16 mA

10 4-12-20 mA MODE

Connecting Pin 10 to Pin L will set the current output range to bipolar 4-12-20 mA (with 12 mA as effective "zero")

J COMMON

K, L for OUTPUT MODE SELECTION

^1 NOTE: The “C” Option may NOT be used in combination with the “P,” “G,” “R,” or “S” Option.
^2 In Form 3 (“33XX”) instruments with the “C” Option, current-output circuitry is integrated with the 3300 HI-LO Limits Board.
^3 For all other (limit-related) I/O connections for Form 3 (“33XX”) instruments with the “C” Option, see the Model 3300 HI-LO Limits Instruction Manual.

R6 10K R19 15K R24 12 MA R20 12.4 K R25 1K 4MA R21 9040K +9 +9V +9V U3 4052 I3 I4 X1 X2 X3 X4 A -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9V +9V -9N 15X2 11X3 11X4 11X5 11X6 11X7 11X8 11X9 11X10 11X11 11X12 11X13 11X14 11X15 11X16 11X17 11X18 11X19 11X20 11X21 11X22 11X23 11X24 11X25 11X26 11X27 11X28 11X29 11X30 11X31 11X32 11X33 11X34 11X35 11X36 11X37 11X38 11X39 11X40 11X41 11X42 11X43 11X44 11X45 11X46 11X47 11X48 11X49 11X50 11X51 11X52 11X53 11X54 11X55 11X56 11X57 11X58 11X59 11X60 11X61 11X62 11X63 11X64 11X65 11X66 11X67 11X68 11X69 11X70 L308 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 0 P3-S B P3-ID P3-L D LOAD + OUTPUT PIN B COMMON PIN J + CURRENT MODES NO STAP 4 TO 20 MA MODE 9 TO K ± 16 MA MODE 4-Ⅱ-20 MODE I2 MA ZERO A B C D E F H U K L A4 T73687 POWER PIN CHART DEVICE PIN TO PIN TO PIN TO UI LM3CE 4 -9V 7 +9V U2 TLO62 4 -9V B PCOM 8 +9V I6 +9V 7 -9V U5 4052 B

CSP	C	7-1-96	WAS VERSION 003	50
TT	B	2-7-96	REV. 884 NO 81	MAY
	A	G-24-96	DATE: 10/07/2010	M
ZONE	REV	DATED	DESCRIPTION	APR	CONTROL
CHL DCT	CSP		DAYTRONIC CORPORATION MIANSBURG, OHIO
CLM DT	DFT
DATE	7-12-93		REV. 7-1-96	REV. LEVEL	C
4 TO 20 MA CURRENT OUTPUT CARD				s3000C NUMBER

3000 SERIES

"G" Option

DUAL GALVANIC ISOLATED OUTPUT

INSTRUCTION MANUAL

1. General Description

With this optional circuit board, a Form 1 (“31XX”) or Form 2 (“32XX”) instrument can furnish two independent galvanic outputs, fully isolated not only from each other but also from the 3000 instrument’s “common.” Each output is normally set at the factory for a full-scale range of 0-10 V-DC (±0.2%) when the data signal from the 3000 unit’s conditioner card is at its standard 5-V level. Though normally preset at “2.00,” each input’s gain can be adjusted within ±5%, if desired, by means of potentiometer controls on the G-option card.

The use of galvanically isolated outputs prevents ground-loop effects in interconnections with remote data-acquisition systems or controllers. The presence of two independent outputs lets you send collected data to two different systems or devices, each with its own ground.

Load limit for each output exceeds 10 kilohms. Output bandwidth is normally 40 Hz; the "G" option can be easily modified, however, for other bandwidths up to 500 Hz (contact the factory for details).

NOTE: The only other options that may be combined with the "G" option are the "B" (battery-powered) and "F" (230 V-AC-powered) options.

2. Additional 3000(G) Specifications

Output Range: ±10 V-DC full scale (2 mA max), normal; internal controls give approximately ±5% of adjustment authority on both SPAN and ZERO

Common-Mode Range: ±500 V, max

Common-Mode Rejection Ratio: DC: -120 dB; at 60 Hz: -60 dB

Linearity: ±0.1% of full scale

Maximum Zero Drift, After Warmup of One-Half Hour: ±0.2% of full scale*

Maximum Span Drift, After Warmup of One-Half Hour: ±0.2% of full scale*

* Applies to the 3000 "G" Option only and does not include possible drift contributed by the signal conditioner board of the base 3000 instrument.

3. Installation and Cabling

When viewing the 3000 instrument from the rear, the Galvanic Output Board is in the upper left of the rear panel (see Fig. 1). Access to the output signals is through a 20-pin edge card connector with a key slot between contact pads 4 and 5. The user must provide his own cable connection to the card, pinout for which is as follows:

Pin No. (see Fig. 1) Function

2,B SIGNAL 1 OUT

1,A,3,C ISO COM 1

9,K SIGNAL 2 OUT

8,J,10,L ISO COM 2

Cabling of the isolated analog outputs is shown in Fig. 2. Each output is single-ended and returns to its own ISO-LATED COMMON. Each output's SHIELD should be tied to the instrument chassis via one of the screws holding the rear panel.

4. Calibration

NO ADJUSTMENT OF THE G OPTION IS NECESSARY DURING NORMAL USE.** Follow the normal calibration procedure given in the respective 3000 Instrument Instruction Manual.

** As mentioned above, separate ZERO and SPAN adjustment controls are provided on the G Option board for each isolated output, if it is desired to refine the "2.00" gain to which the output has been set prior to shipment. These controls, shown in Fig. 3, may be accessed by removing the 3000 instrument's front panel.

Fig. 1 Rear-Panel Location of 3000G Galvanic Output Board
Pinout for I/O Connectors (REAR VIEW)

3000 "G Option" Board I/O Connector (20-pin) Pin 1 Pin 10 Pin A Pin L Conditioner Board I/O Connector (20-pin)

Fig. 2 Cabling of Isolated Outputs

graph TD
    A["Input of G Option Board"] --> B["Pin 2 or B"]
    A --> C["Pin 1, A, 3, or C"]
    A --> D["Pin 9 or K"]
    A --> E["Pin 8, J, 10, or L"]
    B --> F["External Device"]
    C --> F
    D --> F
    E --> F
    F --> G["Shield"]
    G --> H["Output"]
    style A fill:#f9f,stroke:#333
    style F fill:#ccf,stroke:#333
    style G fill:#cfc,stroke:#333

Fig. 3 Location of Internal G-Option Controls

FRONT VIEW 3100G CARD CONTROLS LOCATED BEHIND FRONT PANEL. Conditioner CARD

ISOLATION GUARD P3 P34 P35 R120 U103 R118 49.0K C110 .00uF R119 680K R117 180K R115 100K R113 100K R112 900K C107 .01uF U102 + ISO 1 SUPPLY (+15V) R103 120K - ISO 1 SUPPLY (-15V) R104 1k C105.1uF C106.2uF C107.3uF C108.4uF C109.5uF C110.6uF C111.7uF C112.8uF C113.9uF C114.0uF C115.1uF C116.2uF C117.3uF C118.4uF C119.5uF C120.6uF C121.7uF C122.8uF C123.9uF C124.0uF C125.1uF C126.2uF C127.3uF C128.4uF C129.5uF C130.6uF C131.7uF C132.8uF C133.9uF C134.0uF C135.1uF C136.2uF C137.3uF C138.4uF C139.5uF C140.6uF C141.7uF C142.8uF C143.9uF C144.0uF C145.1uF C146.2uF C147.3uF C148.4uF C149.5uF C150.6uF C151.7uF C152.8uF C153.9uF C154.0uF C155.1uF C156.2uF C157.3uF C158.4uF C159.5uF C160.6uF C161.7uF C162.8uF C163.9uF C164.0uF C165.1uF C166.2uF C167.3uF C168.4uF C169.5uF C170.6uF C171.7uF C172.8uF C173.9uF C174.0uF C175.1uF C176.2uF C177.3uF C178.4uF C179.5uF C180.6uF C181.7uF C182.8uF C183.9uF C184.0uF C185.1uF C186.2uF C187.3uF C188.4uF C189.5uF C190.6uF C191.7uF C192.8uF C193.9uF C200.0kΩ/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/Ω/ ISOLATION GUARD P34A P34B P34B(A) P34B(B) P34B(C) P34B(D) P34B(E) P34B(F) P34B(G) P34B(H) P34B(I) P34B(J) P34B(K) P34B(L) P34B(M) P34B(N) P34B(O) P34B(P) P34B(Q) P34B(R) P34B(S) P34B(T) P34B(U) P34B(V) P34B(X) P34B(Y) P34B(Z) P34B(C) P34B(D) P34B(E) P34B(F) P34B(G) P34B(H) P34B(I) P34B(J) P34B(K) P34B(L) P34B(M) P34B(N) P34B(O) P34B(P) P34B(Q) P34B(R) P35A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0) ISOLATION GUARD P34A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0)A(0) ISOLATION GUARD (CHAMPUL 2 ZERO) + ISO 2 SUPPLY (+15V) + ISO 2 SUPPLY (-15V) + ISO 2 SUPPLY (-25V) + ISO 2 SUPPLY (-35V) + ISO 2 SUPPLY (-45V) + ISO 2 SUPPLY (-55V) + ISO 2 SUPPLY (-65V) + ISO 2 SUPPLY (-75V) + ISO 2 SUPPLY (-85V) + ISO 2 SUPPLY (-95V) + ISO 2 SUPPLY (-105V) + ISO 2 SUPPLY (-115V) + ISO 2 SUPPLY (-125V) + ISO 2 SUPPLY (-135V) + ISO 2 SUPPLY (-145V) + ISO 2 SUPPLY (-155V) + ISO 2 SUPPLY (-165V) + ISO 2 SUPPLY (-175V) + ISO 2 SUPPLY (-185V) + ISO 2 SUPPLY (-195V) + ISO 2 SUPPLY (-205V) + ISO 2 SUPPLY (-215V) + ISO 2 SUPPLY (-225V) + ISO 2 SUPPLY (-235V) + ISO 2 SUPPLY (-245V) + ISO 2 SUPPLY (-255V) + ISO 2 SUPPLY (-265V) + ISO 2 SUPPLY (-275V) + ISO 2 SUPPLY (-285V) + ISO 2 SUPPLY (-295V) + ISO 2 SUPPLY (-305V) + ISO 2 SUPPLY (-315V) + ISO 2 SUPPLY (-325V) + ISO 2 SUPPLY (-335V) + ISO 2 SUPPLY (-345V) + ISO 2 SUPPLY (-355V) + ISO 2 SUPPLY (-365V) + ISO 2 SUPPLY (-375V) + ISO 2 SUPPLY (-385V) + ISO 2 SUPPLY (-395V) + ISO 2 SUPPLY (-405V) + ISO 2 SUPPLY (-415V) + ISO 2 SUPPLY (-425V) + ISO 2 SUPPLY (-435V) + ISO 2 SUPPLY (-445V) + ISO 2 SUPPLY (-455V) + ISO 2 SUPPLY (-465V) + ISO 2 SUPPLY (-475V) + ISO 2 SUPPLY (-485V) + ISO 2 SUPPLY (-495V) + ISO 2 SUPPLY (-505V) + ISO 2 SUPPLY (-515V) + ISO 2 SUPPLY (-525V) + ISO 2 SUPPLY (-535V) + ISO 2 SUPPLY (-545V) + ISO 2 SUPPLY (-555V) + ISO 2 SUPPLY (-565V) + ISO 2 SUPPLY (-575V) + ISO 2 SUPPLY (-585V) + ISO 2 SUPPLY (-595V) + ISO 2 SUPPLY (-605V) + ISO 2 SUPPLY (-615V) + ISO 2 SUPPLY (-625V) + ISO 2 SUPPLY (-635V) + ISO 2 SUPPLY(-645V)- + ISO 2 SUPPLY(-655V)- + ISO 2 SUPPLY(-665V)- + ISO 2 SUPPLY(-675V)- + ISO 2 SUPPLY(-685V)- + ISO 2 SUPPLY(-695V)- + ISO 2 SUPPLY(-705V)- + ISO 2 SUPPLY(-715V)- + ISO 2 SUPPLY(-725V)- + ISO 2 SUPPLY(-735V)- + ISO 2 SUPPLY(-745V)- + ISO 2 SUPPLY(-755V)- + ISO 2 SUPPLY(-765V)- + ISO 2 SUPPLY(-775V)- + ISO 2 SUPPLY(-785V)- + ISO 2 SUPPLY(-795V)- + ISO 2 SUPPLY(-805V)- + ISO 2 SUPPLY(-815V)- + ISO 2 SUPPLY(-825V)- + ISO 2 SUPPLY(-835V)- + ISO 2 SUPPLY(-845V)- + ISO 2 SUPPLY(-855V)- + ISO 2 SUPPLY(-865V)- + ISO 2 Suppvalon (DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRONIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DAD YTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC DADYTRNIC NAMINISBURG, OHIO

CSR	I	11-18-98	BCE 20000	OCH
CSR	H	9-5-97	BCE 9770	EF8
CSR	6	7-1-96	BCE VENZON 800	SES
SLS	F	3-24-94	CORRECTED 7000	FN
SLS	E	2-24-94	DWG. FING 5 700 & 8200	FN
CLM	D	4-9-33	BCE BEX 45400	MN
	C	11-29-90	DBE WEL. ALICE-FLIX 1001-AWE AND CHINA 600	MN
	B	10-31-90	DWG. PION 35500	MN
	A	8-2-98	AWGD 516.000 WITH GROUP HOLD 4	MN
DFT.	REV.	DATED	DESCRIPTION	APP. CONTROL
DSA DES.	DSA DRC.	DAYTRONIC CORPORATION		KLMANSBURG, OHIO
KTS DFT.	FX AP.
DATE	1-12-67	REV 11-18-98		REV. LEVEL. I
GALVANIC ISOLATED OUTPUT NAME OPTION CARD (3100G)				s3000G NUMBER

3000 SERIES

"P" Option

ANALOG PEAK CAPTURE

INSTRUCTION MANUAL

1. General Description

With the installation of a special "P" version of the 3000 Series HI-LO LIMITS board (shown in Figure 2, below), real-time analog peak capture is possible for a Form 2 ("32XX") or Form 3 ("33XX") instrument, in addition to its normal "tracking" function. ^1

Controlled either by front-panel push buttons (Fig. 1) or by a remote user-installed switch (Fig. 3), a "P" unit can "freeze" and display the last positive input-signal "peak" value to have been perceived. The analog output is held at this value until a TRACK/RESET command is applied. ^2 A subsequent higher signal excursion disables the "hold," permitting the capture of subsequent higher peaks. Because it is digitally held, a displayed peak value will not decay. The maximum decay rate for a held analog output is only 0.1% of full scale per minute.

For capture of negative “peaks” (signal minima), the input lines may be inverted.

With all Form 3 instruments, limits are automatically latched upon peak capture, and are automatically reset on return to normal TRACK mode. See the Model 3300 HI-LO Limits Instruction Manual for complete details regarding limit setup and operation (including mode selection, setting of limit setpoint values, and logic output connections for annunciation and control). For selection of engineering-unit digital range and resolution, see the Model 3200/3300 Digital Indicator Instruction Manual.

+ 4798 psi NULL — BALANCE — +CAL SPAN -CAL CONSTAIN GAGE INDICATOR/CONTROLLER DAYTRONIC Model 3378p LOW OK HIGH Set Low Limit Set High Limit Eunder in = Limit Set Both in = Track Both Out = Peak

Fig. 1 Model 3378P Front Panel, showing push buttons for Peak / Track control

Pinout for I/O Connectors (REAR VIEW)

Fig. 2 Rear-Panel Location of 3000P Peak Capture Board

3000 "P Option" Board I/O Connector (20-pin)³ Pin 1 Pin 10 Pin A Pin L Conditioner Board I/O Connector (20-pin)

1 NOTE: The "P" Option may NOT be used in combination with the "C," "G," R," or "S" Option.
^2 To prevent low-level signal noise from triggering a "peak hold," the peak capture function is automatically disabled when the input is less than 8% of full scale. If you require peak capture within the 0-8% range, contact the factory.
^3 In Form 3 (“33XX”) instruments with the “P” Option, peak-capture circuitry is integrated with the 3300 HI-LO Limits Board.

2. Connections

Pin assignments for the 3000P board's 20-pin I/O connector (shown in Fig. 1) are given in the following table.*

Pin Number Function

7 PEAK ANALOG SIGNAL
	Holds peak analog input value when in PEAK mode;follows analog input continuously when in TRACK mode
8 TRACK
	Used for external peak reset control (see Fig. 3, below)
9 SLOW
	Tie to Pin K for narrowband-signal peak processing (DC to 2 Hz)
10 FAST
	Tie to Pin K for wideband-signal peak processing (DC to highest available low-pass filter corner frequency)

B or J** COMMON

K PEAK RESPONSE SELECT

Tied to Pin 9 or 10 to select narrowband or wideband peak processing, respectively

As indicated in the table, a jumper must be installed between PIN K and either PIN 9 ("SLOW") or PIN 10 ("FAST"), depending on whether you want to capture peaks for a narrowband signal (DC to 2 Hz) or a wideband signal (DC to highest available low-pass filter corner frequency), respectively.

3. Operation

As mentioned above, PEAK/TRACK operation can be locally controlled by front-panel push buttons, while the PEAK RESET function can be remotely controlled by a logic-level command to the rear 3000P connector (when the instrument is set to PEAK mode via the front-panel buttons).

For front-panel control, you will use the two LIMIT SET buttons as follows:

BOTH BUTTONS PRESSED ("IN")

Places the unit in TRACK mode. The analog output at Pin 7 will continuously follow the analog input. This mode is used to reset the instrument following peak capture.

BOTH BUTTONS UNPRESSED ("OUT")

Places the unit in PEAK mode. The analog output at Pin 7 will continuously represent the most positive value experienced by the analog input signal since PEAK mode was last begun.

When (and only when) the instrument is set to PEAK mode via the front-panel buttons, a PEAK RESET can be externally applied by connecting Pin 8 of the rear I/O connector with the COMMON line (Pin B or J**), as shown in Fig. 3. Thus, when these pins are connected via an external contact closure (as in the top diagram of Fig. 3), CLOSING the switch will cause the output at Pin 7 to once again TRACK the analog input, while OPENING the switch will return the output to PEAK mode.

Fig. 3
Track/Reset Via External Command (Switch, Open Collector Transistor, or TTL Logic)

8 (TRACK) B or J (COMMON)**

8 (TRACK) B or J (COMMON)**

graph TD
    A["8 (TRACK)"] --> B["TTL"]
    C["B or J (COMMON)**"] --> B["TTL"]

P4 11> 12> 8> FAST ANALOG OUTPUT SLOW ANALOG OUTPUT TO TRACK BUTTONS +9 VOLTS -9 VOLTS DVM HOLD 3> SIGNAL COMMON Q1 2N3704 R13 10K R12 10K U5 1/4 TL074 C7 1uF -9V CR7 1N914 R6 10KMF R8 10KMF R9 10KMF C9 500pF C8 .0047uF R20 10KMF R7 5.6M +9V R11 25K ZERO U2 6 TL071 C9 500pF U6 10 CD4053 Y 15 U6 14 CD4053 X 12 INH VEE 7 -9V CR5 10 FD333 CR6 11 FD333 C4 .1UF C2 .1UF C3 .1UF C4 .1UF C5 .1UF C3 1N914 R21 15M R1B 1K R19 6.8K U3 6 TL071 C4 .1UF C3 .1UF C4 .1UF C5 .1UF CR4 1N914 R17 47K -9V U5 6 TL074 A4 73600 P3 P2 P1 P0 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0 P9 P8 P7 P6 P5 P4 P3

CSR	D	9-4-96	FOR WM2	50
CSR	C	7-18-96	WAS VERSION 999	SES
SLS	B	3-1-94	CHAWAY C 73 WARS	FM
JFS	A	11-18-91	CHNO. WM TO WM	SES
DFT.	REV.	DATED	DESCRIPTION APP.	CONTROL
DAYTRONIC CORPORATION
DATE	12-12-79	REV 9-4-96		REV. LEVEL: D
NAME	3000 PEAK BOARD			53200P

TO 50-8 POLE TO DYN EMPI LOW LIMIT SET POINT PEAK OUTPUT FAST ANALOG OUTPUT SLOW ANALOG OUTPUT +9V +9V 10 +9V 13 3 FINE LOW LIMIT COARSE HUNGER HIGH LIMIT FINE TO SET HIGH LIMIT SWITCH 5A SIGNAL COMMON POWER COMMON +2.5V ROF. 24 4 6 7 8 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190

IC	TYPE	PEN	TO	PEN	TO
U2	TL074	4	+8	11	-9
U3	MC1458	8	+5	4	-9
U7, U8, U9	TL071	7	+9	6	-9
U11	CD4058	16	+9	8, 7, 8	-9
U4	CD4070	14	+9	7	-9
U10	TL074	4	+9	11	-9
U8	740814	14	+5	7	P.C.
U6	75484	1	+5	8	P.C.

BD. NO. 73613.1 BD. DATE: 1-6-92

CSR	J	9-4-96	SEE ECR 8523	CA
CSR	H	7-26-90	WAS VERS 013	B
CSR	G	10:23-98	SEE ECR 8150	MW
LL	F	11-8-94	SEE ECR 7091	MW
SLS	E	5-18-84	SITIMES 0470 000	SS
RLK	D	9-6-93	SEE 0000000	MW
JFS	C	3-25-92	SEE 0000000	MW
JFS	B	11-18-91	SEE, WBS, TW, AVT	SES
	A	1-17-91	SEE, SWS, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 000000	MW
			SEE, A & B, TWS, SEE, WBS, SEE, SWS, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 0000000, SEE 000	MW
SPT.	REV.	DATED	DESCRIPTION	APP.	CONTROL
DES.	J-ZCK	DAYTRONIC CORPORATION
SLS	OK
SPT.	AP
DATE	4-26-80	REV.	9-4-96	REV. LEVEL	S3300P

DAYTRONIC

Daytronic Corporation

Dayton, OH • [phone]

www.daytronic.com