3178FG - Measurement Daytronic - Free user manual and instructions

USER MANUAL 3178FG Daytronic

3178 with options C & G

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 A +SENSE 2

8-Wire Configuration for Cables Longer Than 20 Feet
6-Wire Configuration for Cables Shorter Than 20 Feet

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

graph TD
    A["1"] --> B["+SENSE"]
    A --> C["-SENSE"]
    D["A"] --> B
    E["2"] --> B
    F["B"] --> B
    G["3"] --> H["CAL SENSE"]
    I["4"] --> J["SHIELD"]
    K["9"] --> L["..."]
    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["-EXC"]
    DXC --> DXD["-SIG -SIG"]
    DXD --> DXE["-EXC"]
    DXE --> DXF["-SIG -SIG"]
    DXF --> DXG["-SIG -SIG"]
    DXG --> DXH["-SIG -SIG"]
    DXH --> DXI["-SIG -SIG"]
    DXI --> DXJ["-SIG -SIG"]
    DXJ --> DXK["-SIG -SIG"]
    DXK --> DXL["-SIG -SIG"]
    DXL --> DXM["-SIG -SIG"]
    DXM --> DXN["-SIG -SIG"]
    DXN --> DXO["-SIG -SIG"]
    DXO --> DXP["-SIG -SIG"]
    DXP --> DXQ["-SIG -SIG"]
    DXQ --> DXR["-SIG -SIG"]
    DXR --> DXS["-SIG -SIG"]
    DXS --> DXT["-SIG -SIG"]
    DXT --> DXU["-SIG -SIG"]
    DXU --> DXV["-SIG -SIG"]
    DXV --> DXW["-SIG -SIG"]
    DXW --> DXX["-SIG -SIG"]

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
I +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 (SERIES ONLY
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
    B["-EXC"] --> A["A"]
    B --> F["-SENSE"]
    F --> B
    G["+SIG"] --> B["B"]
    G --> H["-SIG"]
    H --> G
    I["CAL. SENSE"] --> C["C"]
    I --> H
    J["±5V-DC TO 2HZ"] --> H
    K["±5V-DC TO 400HZ"] --> J
    L["COMMON"] --> I0
    style A fill:#f9f,stroke:#333
    style B fill:#f9f,stroke:#333
    style G fill:#f9f,stroke:#333
    style I fill:#f9f,stroke:#333
    style J fill:#f9f,stroke:#333
    style L fill:#f9f,stroke:#333

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 8 10 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["+SIG"]
    B --> F["CAL SENSE"]
    B --> G["C"]
    B --> H["3"]
    B --> I["2"]
    B --> J["1"]
    A --> K["+EXC, +SENSE"]
    K --> L["+SIG"]
    K --> M["3"]
    K --> N["8"]
    K --> O["2"]
    K --> P["A"]
    A --> Q["+EXC, +SENSE"]
    Q --> R["+SIG"]
    Q --> S["3"]
    Q --> T["8"]
    Q --> U["2"]
    Q --> V["A"]
    A --> W["+SENE"]
    W --> X["+SIG"]
    W --> Y["CAL SENSE"]
    W --> Z["C"]
    W --> AA["3"]
    W --> AB["2"]
    W --> AC["1"]
    A --> AD["+SY-DC TO 2HZ"]
    A --> AE["+SY-DC TO 400HZ"]
    A --> AF["+SY-DC TO 600HZ"]
    A --> AG["+SY-DC TO 800HZ"]
    A --> AH["+SY-DC TO 1000HZ"]
    A --> AI["+SY-DC TO 200HZ"]
    A --> AJ["+SY-DC TO 400HZ"]
    A --> AK["+SY-DC TO 600HZ"]
    A --> AL["+SY-DC TO 800HZ"]
    A --> AM["+SY-DC TO 1000HZ"]
    A --> AN["+SY-DC TO 200HZ"]
    A --> AO["+SY-DC TO 400HZ"]
    A --> AP["+SY-DC TO 600HZ"]
    A --> AQ["+SY-DC TO 800HZ"]
    A --> AR["+SY-DC TO 1000HZ"]
    A --> AS["+SY-DC TO 200HZ"]
    A --> AT["+SY-DC TO 400HZ"]
    A --> AU["+SY-DC TO 600HZ"]
    A --> AV["+SY-DC TO 800HZ"]
    A --> AW["+SY-DC TO 1000HZ"]
    A --> AX["+SY-DC TO 200HZ"]
    A --> AY["+SY-DC TO 400HZ"]
    A --> AZ["+SY-DC TO 600HZ"]
    A --> BA["+SY-DC TO 800HZ"]
    A --> BB["+SY-DC TO 1000HZ"]

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["Amplifier"]
    D --> E["Amplifier with inputs M, N"]
    E --> F["Amplifier with outputs M, N"]
    F --> G["Amplifier with inputs M, N"]
    G --> H["Amplifier with outputs M, N"]
    H --> I["Amplifier with inputs M, N"]
    I --> J["Amplifier with outputs M, N"]
    J --> K["Amplifier with outputs M, N"]
    K --> L["Amplifier with outputs M, N"]
    L --> M["Amplifier with outputs M, N"]
    M --> N["Amplifier with outputs M, N"]
    N --> O["Amplifier with outputs M, N"]
    O --> P["Amplifier with outputs M, N"]
    P --> Q["Amplifier with outputs M, N"]
    Q --> R["Amplifier with outputs M, N"]
    R --> S["Amplifier with outputs M, N"]
    S --> T["Amplifier with outputs M, N"]
    T --> U["Amplifier with outputs M, N"]
    U --> V["Amplifier with outputs M, N"]
    V --> W["Amplifier with outputs M, N"]
    W --> X["Amplifier with outputs M, N"]
    X --> Y["Amplifier with outputs M, N"]
    Y --> Z["Amplifier with outputs M, N"]
    Z --> AA["Amplifier with outputs M, N"]
    AA --> AB["Amplifier with outputs M, N"]
    AB --> AC["Amplifier with outputs M, N"]
    AC --> AD["Amplifier with outputs M, N"]
    AD --> AE["Amplifier with outputs M, N"]
    AE --> AF["Amplifier with outputs M, N"]
    AF --> AG["Amplifier with outputs M, N"]
    AG --> AH["Amplifier with outputs M, N"]
    AH --> AI["Amplifier with outputs M, N"]
    AI --> AJ["Amplifier with outputs M, N"]
    AJ --> AK["Amplifier with outputs M, N"]
    AK --> AL["Amplifier with outputs M, N"]
    AL --> AM["Amplifier with outputs M, N"]
    AM --> AN["Amplifier with outputs M, N"]
    AN --> AO["Amplifier with outputs M, N"]
    AO --> AP["Amplifier with outputs M, N"]
    AP --> AQ["Amplifier with outputs M, N"]
    AQ --> AR["Amplifier with outputs M, N"]
    AR --> AS["Amplifier with outputs M, N"]
    AS --> AT["Amplifier with outputs M, N"]
    AT --> AU["Amplifier with outputs M, N"]
    AU --> AV["Amplifier with outputs M, N"]
    AV --> AW["Amplifier with outputs M, N"]
    AW --> AX["Amplifier with outputs M, N"]
    AX --> AY["Amplifier with outputs M, N"]

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.

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 DTT	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)

graph TD
    A["Pin 2 or B"] --> B["G Option Board"]
    C["Pin 1, A, 3, or C"] --> B
    D["Pin 9 or K"] --> B
    E["Pin 8, J, 10, or L"] --> B
    B --> F["Shield"]
    F --> G["External Device"]
    G --> H["Signal"]
    H --> I["+"]
    H --> J["-"]
    G --> K["External Device"]
    K --> L["+"]
    K --> M["-"]

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 (CHANNEL 2 ZERO) + ISO 2 SUPPLY (+15V) + ISO 2 SUPPLY (-15V) + ISO 2 SUPPLY (+25V) + ISO 2 SUPPLY (-25V) + ISO 2 SUPPLY (+25V) + ISO 2 SUPPLY (-25V) + ISO 2 SUPPLY (+25V) + ISO 2 SUPPLY (-25V) + ISO 2 SUPPLY (+25V) + ISO 2 SUPPLY (-25V) + ISO 2 SUPPLY (+25V) + ISO 2 SUPPLY (-25V) + ISO 2 SUPPLY (+2Sv)(E)(G)(H)(I)(J)(K)(L)(M)(N)(O)(P)(Q)(R)(S)(T)(U)(V)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(X)(Y)(Z)(W)(Y) ISOLATION GUARD (RIO 2 SVD 2D-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-CC- + ISO 2 SVD 2D-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-S- + ISO 2 SVD 2D-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-DC-S- + ISO 2 SVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-DVD 2D-A

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	DANS. FRANCIS 5 TO 8 AND	FN
CLM	D	4-9-93	BCE BCR 49400	MN
	C	11-29-90	CNE WTR. ALCT-4618 WHIT-REACH AND CHILL	MN
	B	10-31-90	DANS. FRANCIS 5000	MN
	A	8-2-98	ANDER 516-035 WITH GROUP DENT, NO. A	MN
DFT.	REV.	DATED	DESCRIPTION	APP. CONTROL
DSA DES.	DSA CHG.	DAYTRONIC CORPORATION		MIKANSBURG, 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

DAYTRONIC

Daytronic Corporation