3778P - Measurement Daytronic - Free user manual and instructions

USER MANUAL 3778P Daytronic

Death, serious injury, or fire hazard could result from improper connection of this instrument. Read and understand this manual before connecting this instrument. Follow all installation and operating instructions while using this instrument.

Connection of this instrument must be performed in compliance with the National Electrical Code (ANSI/NFPA 70-2014) of USA and any additional safety requirements applicable to your installation.

Installation, operation, and maintenance of this instrument must be performed by qualified personnel only. The National Electrical Code defines a qualified person as “one who has demonstrated the skills and knowledge related to the construction and operation of the electrical equipment and installations, and who has received safety training on the hazards involved.”

Qualified personnel who work on or near exposed energized electrical conductors must follow applicable safety related work practices and procedures including appropriate personal protective equipment in compliance with the Standard for Electrical Safety Requirements for Employee Workplaces (ANSI/NFPA 70E-2012) of USA and any additional workplace safety requirements applicable to your installation.

ADVERTENCIA

The following safety precautions must be followed whenever any type of voltage or current connection is being made to the instrument.

Before connecting to electric circuits or pulse initiating equipment, open their related breakers or disconnects. It is recommended NOT TO install any connection of the instrument on live power lines. Only Qualified Service personnel that have demonstrated the abilities and received the proper safety training are capable of connecting to live circuits.
- Connections must be made to the instrument first, then connect to the circuit to be monitored.
- Wear proper personal protective equipment, including safety glasses and insulated gloves when making connections to power circuits.
- Hands, shoes and floor must be dry when making any connection to a power line.
Before each use, inspect all cables for breaks or cracks in the insulation. Replace immediately if defective.
If the equipment is used in a manner not specified in this user's guide, the protection provided by the equipment may be impaired.

Standard Accessories

Standard accessories
The following table lists the 3700 standard accessories.

Description Part Number
3778 Manual	92364.00
3778 Quick Reference Guide	92369.00
5 Pin connector, analog signals	25657-LF
8 Pin connector, transducer	25658-LF
10 Pin connector, logic	25606.00
*US Power Cord	USSTDCORD (900744)
*European Power Cord	EUROSTDCORD (115369-G1)
*United Kingdom Power Cord	UKSTDCORD (115368-G2)
*Australian Power Cord	AUSTDCORD (901347)
Desk top feet (4ea.)	35058.00
*User specified, one standard only.

1 GENERAL DESCRIPTION AND SPECIFICATIONS

The Model 3778 is a single-channel panel instrument of phase-sensitive carrier-amplifier design, intended for applications involving transformer coupled rotary torque sensors or traditional wheat-stone bridge sensors requiring noise rejection due to specific carrier frequency excitation – signal design. The 3778 will supply excitation, condition and provide a calibrated Engineering Unit's display and analog output signal for the measurement of force, load, torque and other parameters associated with AC based strain gage sensors. The 3778 is designed for use with standard full bridge sensors with user selectable gain, zero, manual phase control and selectable analog output of voltage and current. Display is user configured for engineering unit scaling up to +/- 199950.

The Model 3778 is calibrated either by the "two-point (dead-weight)" process involving known zero & span standards or via the shunt calibration method using front panel (or rear connection) "±CAL" push button controls. Also provided is a "TARE" button for quick zero offset alignment.

FRONT PANEL VIEW OF 3778 CONTROLS (Front Display Cover Removed)

1. X. X. X. X 0 -4 9 9 5 0 ↑ Up Function Down 5 1 - VDC OUT 10 4-20 2 - mA OUT 4-12-20 20 Hz 3 - FILTER 200 Hz 20 Hz 4 - FILTER 2 Hz INT 5 - SHUNT EXT 3.28 6 - EXC FRQ 5.0 7 - N/A FINE ADJUST ZERO SPAN C F C F 5000 ↓ 1 2 3 4 5 6 7 1X. X.X.X 0/ 10000 ↑ ↓ 20000 ↓ ↑ DISPLAY SPAN C F OFF - CAL TARE+ CAL FINE ADJUST COARSE ZERO FINE ZERO COARSE SPAN FINE SPAN WIDE ADJUST ZERO SPAN SYMMETRY MANUAL PHASE DISPLAY SPAN COARSE FINE + CAL + SHUNT - CAL - SHUNT TARE Shunt Reference Jumper ANALOG CONTROL SETTINGS 1 - VOLTAGE OUTPUT - 5.0 or 10.0 VDC 2 - CURRENT OUTPUT - 4-20 Ma 3 - ANALOG FILTER 4 - ANALOG FILTER 5 - SHUNT INTERNAL / EXTERNAL 6 - EXCITATION FREQUENCY 7 - Not Used DISPLAY CONFIGURATION Sw 1,2,3,4 DECIMAL POINT PLACEMENT Sw 5 DUMMY ZERO Sw 6 & 7 DISPLAY RESOLUTION

3778 SPECIFICATIONS

Measurement Range: Adjustable 0.5 mV/V to 5.0 mV/V; nominal full-scale

Transducer Types: Conventional 4-arm strain gage bridges, typically transformer coupled - 120 to 10k Ohm

Excitation: 3.28 or 5.0 KHz (selectable); Nominal 2.77 V RMS up to 70 mA, sensed

Power Supply: Voltage 90 - 250 VAC, 47 -63 Hz

Consumption 10 Watts

Physical Parameters: 5.68" W x 2.84" H x 7.06" D; weight - 3.25 Lbs.

Analog Output: selectable; ± 5, ±10 VDC, 4 -20 mA or 4 -12 -20 mA (20 % over -range on voltage outputs only)

Operating Temperature: 0 to +55 Degrees C, 5 to 95% relative humidity, non-condensing

Altitude: 2000m (6560 ft) maximum

Installation Category: Installation Category II, Pollution Degree 2

Amplifier:

Normal - Mode Range: ± 0.2 V rms operating; ± 8 V without instrument damage

Input Impedance: Differential > 10 MΩ

Offset: vs. Temperature: ±30 ppm μV/°C; vs. Time: ±10 ppm/month

Gain Accuracy: Limited only by calibration accuracy

Gain Stability: vs. Temperature: ±30 ppm/°C; vs. Time: ±10 ppm/month

Linearity: better than ± 0.03% of full scale

Filter: 3-pole modified Butterworth; 3 dB down at 2 Hz, 20 Hz or 200 Hz; selectable

Fast output always enabled, 1 KHz response (J3 Pin 3).

Step-Response Settling Times for the 3778 (in milliseconds)

	3db Frequency	To within 1%	within .1%	within .02%
Fast Output	1000 Hz	0.7	0.9	1.0
Selectable Output	200 Hz	3.7	5.0	5.6
	20 Hz	37	50	56
	2 Hz	370	500	560

1.a PANEL MOUNTING

You can easily mount the instrument in your own precut panel. Cutout dimensions for a panel-mounted unit are standard DIN; panel thickness should not exceed 6 mm (0.24 in). Simply unscrew the two rear-panel CLAMP SCREWS and slide the CLAMP SLIDES rearwards out of their grooves (THE FRONT BEZEL NEED NOT BE REMOVED). Insert the unit through the panel cutout, from the front of the panel (if the unit has rubber feet, these will have to be removed). Then reinstall the CLAMP SLIDES, and tighten the CLAMP SCREWS until the instrument is securely mounted.

CLAMP SCREW CLAMP SLIDE 68 ± 0.7 mm (2.68 ± 0.03 in) 138 ± 1.0 mm (5.43 ± 0.04 in) Panel Mounting

The Model 3778 I/O CONNECTIONS are via removable screw terminals which will accept wire sizes from AWG 12 to 26. NOTE: The recommended transducer cabling would be eight wire, individually shielded, twisted pair - wired as indicated (Fig. 6) Sense lines must be connected at the transducer (as recommended) or at the 3778 screw terminals - as a minimum. Table 1 denotes screw terminal assignments

Rear Panel Connection

SYNC M/S ENABLE HOLD TARE TARE ENABLE LOGIC COM R CAL + R CAL - SHUNT SHUNT + EXCITATION - EXCITATION + SENSE - SENSE + SIGNAL - SIGNAL CAL SENSE SHIELD VDC COM V OUT SEL V OUT FAST 4-20 mA COM 4-20 mA OUT

Table 1

Connector Sc Number	rew Terminal
	Terminal	Label	Function
J1	1	SYNC	Sync Clock connection
J1	2	M/S ENABLE	Master/Slave Sync Output Enable
J1	3	HOLD	Input - Analog Hold command
J1	4	TARE	Input - Analog TARE command
J1	5	TARE ENABLE	External TARE Enable
J1	6	LOGIC COM	Logic Common
J1	7	R CAL +	Remote Positive Shunt Cal command
J1	8	R CAL -	Remote Negative Shunt Cal command
J1	9	SHUNT	External Shunt Resistor connection
J1	10	SHUNT	External Shunt Resistor connection
J2 1 + EXCITATION			+ Excitation Power (RED)
J2 2 - EXCITATION			- Excitation Power (BLACK)
J2 3 + SENSE			+ Sense control
J2 4 - SENSE			- Sense control
J2 5 + SIGNAL			+ Signal Input from sensor (GREEN)
J2 6 - SIGNAL			- Signal Input from sensor (WHITE)
J2 7 CAL SENSE			Calibration Sensing Connection for Shunt
J2 8 SHIELD			Case Shield for cable termination
J3	1	VDC COM	- Signal Output Voltage Common
J3	2	V OUT SEL	+ Signal Output Voltage – Filter Select
J3	3	V OUT FAST	+ Signal Output Voltage – 1 kHz Filter
J3	4	4-20 mA COM	Current Output Common
J3	5	4-20 mA OUT	Current Output Signal

2 CONNECTIONS

J1 - Sync Connections. The Sync connection is used when more than one 3778 or 3730 unit(s) are installed in an application that either the unit, cabling or the measurement sensor are in close proximity to where "cross talk" or "drifting" of the measurement occurs. To eliminate this condition; one 3778 unit should be declared the "Master" sync clock unit and the other 3700 unit(s) should be configured for "Slave" mode to accept the Sync pulse from the Master. Wiring is shown below. Note: When utilizing "Sync" units must have the same excitation frequency setting. When using only two instruments, different excitation frequency settings can be used to eliminate this problem, if acceptable for the sensor that is connected to each instrument.

Fig. 4

Master – Slave Sync Connections

When more than one 3778 instrument is being used in the same measurement setup, beat frequencies can be produced by the excitation clock oscillator circuit. To prevent this, the user should declare one of the 3778 unit as the Master and the other unit(s) should have M/S ENABLE tied to LOG COM and wired as shown with the SYNC terminals connected for the Master's clock to Synchronize the Slave units. Excitation frequency settings must be the same.

J1 SYNC M / S ENABLE LOGIC COM Additional 3778 Instrument (M/S ENABLE to LOG COM) J1 SYNC M / S ENIB LOG COM Additional 3778 Instrument (M/S ENABLE to LOG COM)

Master 3778 Instrument

SYNC M / S ENB LOG COM J1 SYNC M / S ENB LOG COM J1

J1 - HOLD, TARE & REMOTE SHUNT CALIBRATION Logic Connections. These

connections are used when external control of the "HOLD", "TARE" or "± SHUNT CAL" features of the unit are enabled or controlled by an external switch, PLC or relay. The input Command signals are activated when connected to LOGIC COMMON and will affect the display and analog output signals present on J3.

Fig. 5
J1 Logic Controls

HOLD TARE TARE ENB LOG COM R CAL + R CAL - HOTTON, Contact Relay, Switch...... when connected to LOGIC COMMON

HOLD

Activates Analog HOLD when connected to LOGIC COMMON

TARE

Activates Analog TARE when connected to LOGIC COMMON

TARE ENABLE

Enables remote TARE and disables front panel TARE, when connected to LOGIC COMMON

LOGIC COMMON

Connection to enable rear panel features

R CAL +

Activates the Positive SHUNT Calibration when connected to LOGIC COMMON

R CAL -

Activates the Negative SHUNT Calibration when connected to LOGIC COMMON

2 CONNECTIONS

J1 – Shunt Resistor Connections. Two terminal pins are provided via the J1 rear connector for installation of an external shunt resistor. Terminal connections are used to install a user defined resistor as determined by the sensor's calibration data sheet or pre-determined by the user. When an externally installed resistor is used, the ANALOG CONTROL switch 5 is required to be in the External position (Switch 5 DOWN).

Note: The 3778 unit comes with an internally installed 59K Ohm resistor, as standard, and enabled when the front panel ANALOG CONTROL Switch# 5 is in the Internal position (Switch 5 UP).

Note: When a sensor has an integrated shunt resistor, the ANALOG CONTROL switch setting needs to be in the External position and a shorting wire in place of the external shunt resistor position. This provides the electrical path for the Calibration Sense line to enable the sensor's internal shunt resistor when the + or - Shunt Calibration rear terminals or push buttons are activated.

External Shunt Resistor Connections SYNC M / S ENABLE HOLD TARE TARE ENABLE LOGIC COM R CAL + J1 R CAL - SHUNT RESISTOR SHUNT RESISTOR SHUNT Resistor – User Provided (Note: ANALOG CONTROL switch 5 must be in the External position)

NOTE: Daytronic Shunt Calibration circuit, when activated, will place the Shunt resistor across the + Sense Line (for positive shunt) or the - Sense Line (for negative shunt) with the connection of the Sensor's Calibration Sense line located on the J2 connector - which is recommend to be connected to the + Signal line. When not activated, the Calibration Sense line is buffered as to not affect the sensor's operational characteristics. If Shunt calibration (when not activated) needs to be reference to ground, which is the case specified for some transducers, then a jumper connection needs to be installed via the front panel as shown below next to the Coarse Zero adjustment. This connection will reference the shunt circuit correctly to conform to the transducer's certified calibration document.

FINE ADJUST ZERO SPAN ↑ ↑ C F C F 1. X.1 SHUNT REFERENCE Jumper ZERO WIDTH

2 CONNECTIONS

Fig. 7 Model 3778 Transducer Cabling - AC Strain Gage (8 wire)

+ EXCITATION - EXCITATION + SENSE - SENSE + SIGNAL - SIGNAL CAL SENSE SHIELD + EXCITATION - EXCITATION + SENSE - SENSE + SIGNAL - SIGNAL CAL SENSE SHIELD

Model 3778 Transducer Cabling - Rotary Torque w/ External Shunt Pin
Rotary Torque Sensor Wiring Example

graph TD
    A["+EXC -SIG"] --> B["(ROTOR)"]
    C["SIG+"] --> D["EXC"]
    B --> E["STATOR"]
    D --> F["EXC"]
    E --> G["B"]
    F --> H["C"]
    G --> I["E"]
    H --> J["D"]
    I --> K["A"]
    J --> L["TRANSDUCER CONNECTOR"]
    K --> M["+Signal - Signal"]
    L --> N["Calibration Sense"]
    M --> O["N/C"]
    N --> P["N/C"]
    Q["SHUNT SHORTED"] --> R["(SHIELD)"]
    S["DAYTRONIC"] --> T["BLK"]
    U["+Excitation"] --> V["Excitation"]
    W["+Excitation Sense"] --> X["Excitation Sense"]
    Y["+Signal"] --> Z["GRN"]
    AA["SHUNT NEGATIVE"] --> AB["- CAL + CAL"]
    AC["SHUNT POSITIVE"] --> AD["+ CAL - SHUNT POSITIVE"]
    AE["RED"] --> AF["(-EXCITATION)"]
    AG["WHT"] --> AH["(-SENSE)"]
    AI["BRIN"] --> AJ["(-SIGNAL)"]
    AK["SHIELD"] --> AL["SHIELD"]

WARNING

Qualified personnel who work on or near exposed energized electrical conductors must follow applicable safety related work practices and procedures including appropriate personal protective equipment in compliance with the Standard for Electrical Safety Requirements for Employee Workplaces (ANSI/NFPA 70E-2012) of USA and any additional workplace safety requirements applicable to your installation.

Note: Cable should be low capacitance, low resistance – Four Twisted pair, shielded cable. Paired as shown. Recommended Cable - Daytronic Part # 77029.00 or Belden 8164

For proper operation, sense lines must be connected at the transducer or at the rear panel of the 3778. It is recommended, if cabling is greater than 20 feet to use the eight wire configuration.

2 CONNECTIONS

J3 - Analog Connections. Connections are used to provide analog outputs from the meter's signal conditioning area in the form of ±5 VDC or ±10 VDC (selectable via the front panel controls) and 4-20 mA (or selectable 4-12-20 mA).

graph TD
    A["Analog Voltage Output +/- 5 Vdc or +/- 10 Vdc with fixed cutoff filter @ 1 KHz"] -->|+ SIGNAL| B["Terminal Block 1"]
    A -->|- SIGNAL| C["Terminal Block 2"]
    D["Analog Voltage Output +/- 5 Vdc or +/- 10 Vdc with front panel selectable filter @ 2/20/200 Hz"] -->|+ SIGNAL| E["Terminal Block 3"]
    D -->|- SIGNAL| F["Terminal Block 4"]
    G["Analog Current Output 4-20mA, 4-12-20mA at selected cutoff filter"] -->|+ SIGNAL| H["Terminal Block 5"]
    G -->|- SIGNAL| H

Analog Output Connections

VDC COM - Pin 1

Voltage Common (- Signal out); Negative reference for Pin 2 and Pin 3 Voltage Output of the amplified analog signal.

V OUT SEL - Pin 2

Voltage Output Selected (+Signal out) reference to Pin 1. The Full Scale Voltage is determined by the position of switch 1 - VDC on the Conditioner Controls. Voltage Filter output response of this signal is determined by the position of switch 3 - FIL and 4 - FIL on the Analog Controls.

V OUT FAST - Pin 3

Voltage Output Fast. (+ Signal out) reference to Pin 1. Full Scale Voltage is determined by the position of switch 1 - VDC of the Conditioner Controls. Filter response is fixed at the highest analog signal response of 1 KHz.

4-20mA COM - Pin 4

4 - 20 mA Current Output Common (- Signal) reference for Pin 5 Current Output.

4-20mA OUT - Pin 5

4 - 20 mA Current Output (+Signal) reference to Pin 4 Current Output Common. Mode of the Current Output is selectable for 4 - 20 mA or 4-12-20 mA as determined by the position of switch 2 -mA of the Conditioner Control switch(s) on the Front Panel.

Digital Display Range and Decimal Point Selection

Configures the Engineering Unit Digital Display Range. Three selections are available to set the display operation for 1 count in 5000, 2 counts in 10000 or 5 counts in 20000 resolution. These full scale display ranges correspond to the analog output full scale value of ±5 VDC or ±10 VDC as selected via the analog controls and when the Display Span control is set to the "OFF" position (see below).

1. X. X. X. X 0 ÷1 9 9 9 5 0 FINE ADJUST ZERO SPAN C F C F ↑↑↑↑↑↑ 1. X. X. X. X 0 5000 ↓ ↓ 1 2 3 4 5 6 7 10000 ↑ ↓ 20000 ↓ ↑

Switch 1 - selects decimal point for position X.XXXXX Switch 2 - selects decimal point for position XX.XXXX Switch 3 - selects decimal point for position XXX.XXX Switch 4 - selects decimal point for position XXXX.XX Switch 5 - enables dummy zero display digitXXXX0 Switch 6 & 7 - selects Display Full Scale Range.

Display Span Adjustments

Used to adjust the digital readout of the 3778 meter independent of the analog signal when not in the "OFF" position. After setting the analog output signal level, the user rotates the Display SPAN "C" Coarse controls and adjust the Display "F" (fine) control for proper engineering units display. Example: if the unit is connected to a 750.0 in/Lb. transducer – adjust the analog output for maximum full scale analog output. Once achieved, rotate the Display "C" control from "OFF" to approximately 750.0 on the display. Use the Display SPAN "F" control for fine adjustment of the readout for the 750.0 reading on the display.

DISPLAY SPAN C F OFF SYM + CAL - CAL TARE

Display Coarse Span - 16 position switch to adjust wide display span / gain authority Display Fine Span - 25 Turn potentiometer for fine span / gain control of display reading Display “OFF” – switch position “F” – “OFF” which disables the Display Span feature

3 CONTROLS (cont.)

Analog Control Settings

Analog Control - 7 position dip switch configures the main parameters of the AC Signal conditioner for excitation frequency, mode of the analog output signal, low pass filter characteristics and internal or external shunt selection.

1 2 3 4 5 6 7 10000 1 X.X.X.X B 20000 ZERO SPAN 1234567 SYM WIDE ADJUST ANALOG CRTL DJUST OYMETRY D

1 - 5 VDC Output - UP sets the analog output FS to 5 VDC, DOWN is 10 VDC

2 - 4 - 20 mA - UP sets the analog current output for 4-20 mA, DOWN is 4-12-20ma

3 - 20/200 Hz - UP selects 20 Hz filter. DOWN selects 200 Hz filter

4 - 20/2 Hz - UP selects 20 Hz filter. DOWN selects 2 Hz filter

5 - Shunt - UP selects the Internal Shunt, DOWN is External

6 - Excitation Frequency - UP selects 3.28 KHz, DOWN 5.0 KHz

7 - Not Used

With all of the switches in the up position, the unit will have the following settings:

■ 3.28 KHz Excitation frequency

■ The full scale analog output will be 5.000 VDC

• The current output will be set for 4 ma = zero and 20 ma will = positive full scale

■ The selected analog output - low pass filter will be set for 20 Hz

• Internal SHUNT resistor of 59K is selected.

Analog Control Settings for Conditioner Configuration

↑	Function	Down ↓
5	1 - VDC OUT	10
4-20	2 - mA OUT	4-12-20
20 Hz	3 - FILTER	200 Hz
20 Hz	4 - FILTER	2 Hz
INT	5 - SHUNT	EXT
3.28	6 - EXC FRQ	5.0
	7 - N/A

Analog Control Settings (red switch array)

The selection of the 7 front panel analog control settings will configure the signal conditioning section of the meter. The position of the switches will depend on the type of sensor, its parameters and the expected analog output signal levels along with the analog output signal's 3db roll-off response characteristics.

3 CONTROLS (cont.)

Analog Wide Gain and Wide Zero Controls

Rotary range control switches for setting of the gain of the analog output signal of the 3778 meter. Each control step will in turn affect the digital readout for engineering unit's adjustments.

1 2 3 4 5 6 7 ↑ ↑ ↑ ↑ ↑ ↑ 1.X.X.X.X 0 5000 ▼ ▼ 10000 ↑ ↓ 20000 ↓ ↑ ZERO SPAN 1234567 SYM WIDE ADJUST ANALOG CRTL DJUST OYHSTOY D

Wide Zero - 16 position switch to adjust wide zero authority, approx. 13% / position Wide Span - 16 position switch to adjust wide sensor gain ranges

Fine Analog Zero and Span Adjustments

Potentiometer controls for the fine adjustment of the gain and zero settings of the analog output signal of the 3778 meter. These controls are present when the front panel is re-installed and are used for fine re-adjustment of the sensor's calibration measurement.

FINE ADJUST ZERO SPAN C F C F 1.X. ZERI WIDE

Coarse Zero - 22 Turn potentiometer adjustment for balance control of the analog signal

Fine Zero - 25 Turn potentiometer for fine balance control of the analog signal

Coarse Span - 22 Turn potentiometer adjustment for the analog control of gain

Fine Span - 25 Turn potentiometer adjustment for the analog control of fine gain

3 CONTROLS (cont.)

Analog Symmetry, Phase, ± CAL, TARE

5000 0000 0000 DISPLAY SPAN C F 5 6 7 SYM ∅ + CAL - CAL TARE OG CRTL

SYM Symmetry - Adjust the negative gain slope for symmetrical analog adjustment as referenced to the positive span value. 20 Turn potentiometer, with approx. ± 2% authority

Phase - Used to compensate for cable and sensor characteristics to allow synchronization of the return signal phase to the excitation phase. 20 Turn potentiometer, with approx. +/- 35 Degrees authority

+ CAL Calibration Positive Shunt - Push switch, when depressed connects the Internal or External (as selected) Shunt resistor across + SENSE and CAL SENSE

- CAL Calibration Negative Shunt - Push switch, when depressed connects the Internal or External (as selected) Shunt resistor across - SENSE and CAL SENSE

TARE Tare - Push / Push switch. When active, offsets the present sensor signal input to "Zero". When activated, a green LED light will illuminate, during activation process, LED will light Yellow. If disabled, or out of range, LED will be RED. TARE maybe remotely activated via rear J2 connections. Front panel TARE can be disabled via J2 Pin 4 being connected to Logic Common, Pin 3.

4. CALIBRATION - 2 Point - Dead Weight with known input

This section contains the instructions for calibrating the 3778. Reference the description of the instrument front-panel (see Page 1). To perform calibration, proceed as follows.

(a) Connect Power, Sensor and Analog terminals as required. Apply power. The front-panel digital display should light indicating the application of the AC input power. Allow 10 minutes of warm up for stabilization of transducer characteristics. Remove the front panel cover of the 3778 unit which is held in place by the two small Phillips screws.
(b) Position the front panel switches to the desired settings for the application. Refer to Section 3 for details. Insure TARE is not engaged.
(c) Center the Zero and Span potentiometers as needed by rotating the potentiometers fully CW (Coarse is 22 turns, Fine is 25 turns), then reverse direction - CCW (Coarse 11 turns and Fine 13 turns) to obtain mid-authority of the controls. Typically this is done on initial calibration. When recalibrating for minor adjustments this may not be required.
(d) With mechanical Zero or Balance established at the transducer (transducer “relaxed”); Adjust Wide Zero then Coarse Zero and then Fine Zero for the Zero position reading on the display or the desired analog output signal. Note: Display can be adjusted independently to the analog signal when the Coarse Display control is not in the “OFF” position.
(e) Apply a known span reference standard (dead weight torque / load) so the sensor is greater than 50% of the positive full scale (or preferred - the “nominal” operating value of the transducer). Adjust the Wide Span then Coarse Span and then the Fine Span to obtain an approximate display or analog value for the instrument. Once this level is establish, Adjust the 3778 Phase control to obtain the highest magnitude on the display. This “peak” or “hump” will synchronize the Excitation phase with the return Signal Phase for proper operation of the 3778 unit. Once Phase has been accomplished, the 3778 will not need to be re-phased for subsequent calibrations unless the cable or the transducer is replaced. Re-establishment of Wide Span may be needed if the phase adjustment causes display saturation.
(f) Return the sensor to the Zero position in step (d) and re-adjust the Zero controls as needed to obtain the proper reading (or analog signal) for the application's zero position.
(g) Apply a known full scale Load to the sensor. Preferably in the positive direction. This should represent the “nominal” working level of the sensor. Re-Adjust the Coarse Span and Fine Span controls, as needed, for precise engineering units reading on the display as well as the analog output desired.
(h) Repeat Steps (f) and (g) to obtain proper measurement readings since the Gain - Span controls will affect the Zero amplification of the input signal.
(i) Once completed, if the sensor is going to be utilized in the Negative or CCW mode, it is recommended to reverse the dead weight Load on the sensor to a known “negative” load and adjust the Symmetry control for a proper symmetrical reading of the sensor input. Note the Symmetry control affects the Negative Span for approx. ± 2% of full scale adjustment control.
(j) Re-install the front panel. Fine Span and Zero controls are accessible with front panel installed.
(k) Use the + CAL and - CAL buttons to activate positive or negative shunt for future reference purposes as a means of verification of the calibration. Sensor should be in the zero or relaxed position when performing Shunt calibration activation.

4. CALIBRATION – Shunt Calibration

This section contains the instructions for calibrating the 3778 using the Shunt calibration method. Note: To calibrate the 3778, a known nominal load should be used to properly adjust the Phase control prior to establishing a Shunt calibration for the measurement system.

(a) Connect Power, Sensor and Analog terminals as required. Apply power. The front-panel digital display should light indicating the application of the AC input power. Allow 10 minutes of warm up for stabilization of transducer characteristics. Remove the front panel cover of the 3778 unit which is held in place by the two small Phillips screws.
Note: The 3778 unit has an internal 59K Shunt resistor installed within the unit. If a different resistor or resistor value is to be used to correspond to the transducer's calibration sheet; install the resistor on the rear terminal provided and place the Analog Control switch 5 to External. See page 9. Shunt calibration is only active if the CAL Sense line is connected to the + Signal line. For transducers with an internal shunt resistor: 1.) Cal Sense should be attached to the transducer's shunt activation connector pin; 2.) External Shunt selected on the Analog Controls; 3.) A shorting wire is installed in place of the External Shunt resistor terminals on the rear of the unit.
(b) Position the front panel switches to the desired settings for the application. Refer to Section 3 for details.
(c) Center the Zero and Span potentiometers as needed by rotating the potentiometers fully CW (Coarse is 22 turns, Fine is 25 turns), then reverse direction - CCW (Coarse 11 turns and Fine 13 turns) to obtain mid-authority of the controls. Typically this is done on initial calibration. When recalibrating for minor adjustments this may not be required.
(d) With mechanical Zero or Balance established at the transducer (transducer “relaxed”); Adjust Wide Zero then Coarse Zero and then Fine Zero for the Zero position reading on the display or the desired analog output signal. Display can be adjusted independently to the analog signal.
(e) Apply a known span reference standard (dead weight torque / load) so the sensor is greater than 50% of the positive full scale (or preferred - the “nominal” operating value of the transducer). Adjust the Wide Span then Coarse Span and then the Fine Span to obtain an approximate display or analog value for the instrument. Once this level is establish, Adjust the 3778 Phase control to obtain the highest magnitude on the display. This “peak” or “hump” will indicate the synchronization of the Excitation phase angle with the Signal Phase angle for proper operation of the 3778 unit. Once Phase has been accomplished, the 3778 will not need to be re-phased for subsequent calibrations unless the cable or the transducer is replaced.
(f) Return the sensor to the Zero position in step (d) and re-adjust the Zero controls as needed to obtain the proper reading (or analog signal) for the application's zero position.
(g) Depress and hold the + CAL button while adjusting the Coarse Span and Fine Span controls, as needed, for precise engineering units reading on the display as determined by the sensor's calibration sheet or other reference data (see Equivalent Input shunt calculation below).
(h) Repeat Steps (f) and (g) to obtain proper measurement readings since the Gain - Span controls will affect the Zero amplification of the input signal.

4. CALIBRATIO N (cont.) – Shunt Calibration

(i) Once completed, if the sensor is going to be utilized in the Negative or CCW mode, depress and hold the - CAL button and adjust the Symmetry control for a proper symmetrical reading of the shunt input as noted on the sensor's calibration data sheet. Note the Symmetry control affects the Negative Span for approx. ± 2% of full scale adjustment control.

(j) Release the Cal button and adjust Zero as needed. Re-install the front panel to the instrument. Minor adjustments and controls are assessable via the front of the unit.

Shunt Resistor Calculation

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.

$$ \mathrm{X} = \frac {2 5 0 0 0 \mathrm{xRb}}{\mathrm{KxRc}} $$

Where X = Equ ivalent Input, % of full scale

Rb = bridge resistance, ohms

K = transducer sensitivity, mv/v full scale

Rc = calibration resistance, ohms (59 K installed)

Sample Calculation: Assume that K = 3.000 mv/v for a 5000-pound load cell (full scale) with a bridge resistance of 350 ohms and using the internal 59K Ohm shunt.

$$ \frac {25000 \times 350}{59000 \times 3} = 49.44 \% \text{of full scale} = 2472 \text{pounds} $$

Per this example, when the + CAL switch is depressed, the reading should be 2472, with the sensor at no load.

Display Calibration The 3778 instrument display has separate adjustment controls that are independent of the analog controls. This allows the user to alter the display reading to a value that is suited for the engineering units display reading required while maximizing the analog output signal. In a standard – default “OFF” switch position of the Display Coarse Span control, the display has a full scale reading set by the display range switches of 5000, 10000 or 20000 counts. At the selected reading, the full scale analog output signal will be 5 VDC or 10 VDC, as selected via the analog controls.

To accomplish the display adjustment change, the user would first set the desired display range and decimal location using the display dip switches, adjust the analog output to the desired level and then adjust the Display Coarse and Fine span controls for the required digital readout. Returning the Display C (coarse) control to the designated "OFF" position will return the display to the default condition as described above.

Master/Slave Connections. When more than one 3778 is being used in a measurement setup (instruments are closely mounted or the transducer cabling is in a common conduit or raceway), beat frequencies may be produced from the 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 Section 2.

Phase & Signal Reversal: The phasing signal is derived from the excitation circuit. Therefore when doing signal reversal, (+ to -, or CW to CCW) it must be accomplished by reversing the signal leads, not the excitation & sense leads from the transducer to the conditioner.

Tech Tip: The inability to balance correctly where the unit output reads totally off scale and the zero 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 below. The star bridge simulates a conventional four-arm bridge in an exact condition of balance. To construct a star bridge connect four resistors as shown; use 180-ohm resistors to approximate a 350-ohm bridge. Neither the resistor values nor temperature characteristics are critical. Solder two excitation resistors together, and then solder the two Signal 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 module 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 meter is at fault.

USE JUMPER WIRE TO CONNECT 4 RESISTORS MODULE I/O CONNECTOR +EXC +SENSE -SIG -EXC -SENSE +SIG CAL SENSE

Star-Bridge Construction

Tech Tip on use of wide range settings for the AC Strain Gage Conditioner

Due to multiple amplifier stages within the 3778 instrument, attention to the proper gain setting and understanding of the sensor inputs should be reviewed to produce a linear-amplified analog output signal and display reading.

The wide span – gain control (as shown in the front panel diagram) has 16 positions to amplify the incoming signal by incremental steps. Each step is positioned so the Coarse and Fine Span potentiometer controls overlaps each step to provide a continuous linear gain of the signal from 0.5 mV/V to 5.0 mV/V full scale. Below is a table of each wide gain steps, indicating the nominal low and high input signal range per position – full scale in mV/V to the meter.

Wide Span Position	SPAN-Low mV/V	SPAN-High mV/V
0	3.80 5.30
1	3.30 4.60
2	2.90 4.00
3	2.50 3.50
4	2.20 3.00
5	1.90	2.60
6	1.65 2.30
7	1.45 2.00
8	1.25 1.70
9	1.10	1.50
A	0.95	1.30
B	0.80 1.15
C	0.70	1.00
D	0.60 0.85
E	0.55 0.75
F	0.47 0.65

AC Strain Gage Sensors sensor:

AC Strain Gage Sensors will typically specify their electrical sensitivity in mV/V at full scale or can be calculated via the SHUNT calibration value as determined by the data sheet specific to the transducer being calibrated. As a reference, the above table can be used as a guide to determine the working full scale range of the transducer during calibration and the proper position of the Wide Span control. If needed, amplification can be maximized if the nominal range or working range of the sensor is not at full scale. Each gain step is approximately ±16% .

5. FUSE REPLACEMENT

Should you suspect a blown fuse proceed as follows.

WARNING

Installation, operation and maintenance of this instrument must be performed by qualified personnel only. The National Electrical Code defines a qualified person as “one who has the skills and knowledge related to the construction and operation of the electrical equipment and installations, and who has received safety training on the hazards involved.”

a) Disconnect all power sources and cables connected to the instrument before servicing the instrument.
b) On the rear panel remove the (2) clamp slide retaining screws and remove the clamp slides from both sides of the instrument. Next remove the (4) corner screws that retain the rear panel to gain access to the instrument.
c) Open the rear panel and replace the fuse(s) as required, replace only with same type T Slow Blow, 1A, 250V (Littelfuse 218001.HXP, 1 A). The fuseholder wire conductors are appropriately labeled "L" for Line and "N" for Neutral on both halves of each of the fuseholder wires. When reassembling the fuseholder(s) make sure "L" and "L" are connected together and "N" and "N" labeled wires are connected together properly.
d) Mate the rear panel to the enclosure and replace the clamp slides back in position and secure the clamp slides with the (2) screws previously removed from the instrument. Next, replace the (4) corner screws to secure the rear panel and ensure that all screws have been adequately tightened.
e) Power ON the instrument with the appropriate power cord and verify the instrument is functioning properly before reconnecting the instrument to your installation.

WARNING

For continued protection against risk of fire or shock replace only with the same type and rating of fuse.

ADVERTENCIA

Do not replace fuse again if failure is repeated. Repeated failure indicates a defective condition that will not clear with replacement of the fuse. Refer condition to a qualified technician.

ADVERTENCIA

Product Warranty and Repair

Daytronic Corporation warrants its products to be free from defects in material and workmanship, under normal and proper use in accordance with our instructions, for the period of one year for date of shipment. Our liability under such warranty or in connection with any other claim relating to the products shall be limited to, at our option, the repair or replacement of any products or parts or components thereof which are returned to us freight prepaid and which are defective in material or workmanship or the refund of the purchase price to the Buyer.

ANY PRODUCT FOUND TO BE DAMAGED THROUGH CUSTOMER NEGLIGENCE OR MISUSE MAY BE EXCLUDED FROM ANY AND ALL POLICIES CONTAINED IN THIS DOCUMENT.

ALL EQUIPMENT TO BE REPAIRED OR REPLACED UNDER WARRANTY MUST BE RETURNED TO THE FACTORY. Before returning a product or products for any reason, the customer must call Daytronic Customer Support Services at [phone] to request a RETURN MATERIAL AUTHORIZATION (RMA). Once the customer has provided the necessary information and has been assigned a specific RMA, the product(s) in question may be returned to Daytronic by shipping it

Daytronic Corp., 1000 New Durham Road, Edison, New Jersey 08818 Daytronic Customer Service: 1-800-668-4745 [e-mail]

DAYTRONIC

Daytronic Corporation Dayton OH USA www.Daytronic.com

3700 SERIES

"P" Option

ANALOG PEAK CAPTURE

INSTRUCTION MANUAL

DRYTRONIC 3760 DC +4.9860 c f c f ZERO SPAN +CAL TAPE

3700

Instrument Series

3700 SERIES

"P" Option

ANALOG PEAK CAPTURE

INSTRUCTION MANUAL

1. General Description

The "P" option of the 3700 Series Meter is an added function card which provides the ability of the meter to capture and hold + Peak, -Peak, Max-Min or TIR value that originates from the base 3700 instrument. Any 3700 (except Horsepower 3741) can accommodate the "P" option. Peak Mode signals are captured in real-time analog capacitive memory and are available for display and analog output monitoring. Only one of the following four separate modes can be configured for the Peak Capture operation.

PEAK MODE
Description

+ PEAK	Captures and holds the most positive measurement signal in the positive quadrant
- PEAK	Captures and holds the most negative measurement signal in the negative quadrant
MAX + MIN	Captures and holds the sum of the MAXIMUM and MINIMUM signal values
TIR	Captures and holds the difference in the Positive and Negative Peak values only in the positive signal quadrant of the measurement

Peak functions are configured using the rear panel dip switches and connector terminals as illustrated in figure 1. Dip switch configuration enables various features - front panel TARE push button function, Peak Mode selection, Analog signal source of either the Fast or Select signal from the main 3700 unit, and Threshold detection levels for Have Peak Capture and logic triggering.

Rear panel connector terminals are used for remote control using logic switches or PLC type I/O control to activate / reset meter functions. Logic I/O signals for Peak Arming and Clearing (tracking) of the Peak capture value, switching the display from Live to Peak, Have Peak output and front panel enabling of the TARE switch for Peak/Reset of the captured value. The resultant analog captured signal is available via the "PEAK" connector terminal as noted in section 3 - Connections.

Fig. 1 3700P Peak Capture Option - Rear Panel Layout

INPUT 85-264~.5A 47-63Hz www.daytronic.com SYNC M/S ENABLE HOLD TARE TARE ENABLE LOGIC COM R NULL N/C N/C N/C ANALOG SEL PEAK SEL PEAK SEL DISPLAY TARE SW TRESHOLD HV PK LEVEL HAVE PK LOGIC TRACK/PEAK TRACK/HOLD LOGIC COM DISPLAY SEL TARE SW SEL VDC COM VOUT PEAK THRESHOLD + EXCITATION - EXCITATION + SENSE - SENSE + SIGNAL - SIGNAL CENTER TAP SHIELD VDC COM V OUT SEL V OUT FAST 4-20mA COM 4-20mA OUT

Threshold adjustment potentiometer located to the right of the Peak I/O connection is used for level adjustment of the "Have Peak" detection around the input signal's Zero level. This adjustment is used to prevent low-level signal content from triggering an inadvertent "Peak Hold". Adjustment level is viewable from the front panel (SW 6 Down) and is adjustable from 1 to 8% of full scale.

2. DIP Switch Configuration

Located on the rear panel above the main board connections, the 7 position dip switch configures the PEAK functions of the meter. The Default position of the switch is in the UP (ON) position as noted in the table below.

ON 1 2 3 4 5 6 7

Viewed from the rear. Switch "Rocker" in the UP position, is ON and considered the Default function as described below.

Default Position - Switches are all "ON" (UP)

Analog Signal Source	FAST analog signal response from main 3700
PEAK Mode	+ PEAK Mode of operation, see Fig 4
Display Reading	LIVE measurement signal is displayed
Front Panel TARE	Normal TARE switch operation
Peak Capture	1% of Full Scale between Live and Peak level detection

Switch #

Function

1	ANALOG SIGNAL SOURCESelects FAST or SELECTED analog signal source from the main 3700 unit.
2	PEAK MODEUsed with switch 3 for PEAK Mode function - +PEAK, -PEAK, MAX+MIN, TIR
3	PEAK MODEUsed with switch 2 for PEAK Mode function - +PEAK, -PEAK, MAX+MIN, TIR
4	DISPLAYSelects LIVE Reading or PEAK Reading for the front panel display
5	FRONT PANEL TARE SWITCHSelects the front panel TARE switch for TARE or PEAK/RESET function
6	PEAK THRESHOLD DISPLAY ADJUSTSwitches the front panel display to adjust the level for HAVE PEAK THRESH
7	HAVE PEAK DETECTAnalog delta detection level for PEAK capture detection - (Backout level 1% o

Switch # Default - UP (ON)
DOWN (OFF)

1	FAST Analog Signal		SELECT Analog Signal (low pass filtered selected) per main analog controls of the 3700 base unit.
2	+ PEAK - UP				* see note
	- PEAK - DOWN
	MAX + MIN - UP
	TIR - DOWN		+ PEAK	MAX + MIN
3	+ PEAK - UP				* see note
	- PEAK - UP
	MAX + MIN - DOWN
	TIR - DOWN		- PEAK	TIR
4	LIVE display		PEAK Display
5	Front Panel TARE - normal operation		Front Panel TARE used for PEAK / RESET
6	Standard Run-Time Operation		Selects THRESHOLD display adjustment
7	1% Full Scale Peak "Backout" Detect		0.1% Full Scale Peak "Backout" Detect

* Note: When in the Max-Min or TIR mode, the signal may over-range due to the sum of the +/- Peak captured signals being greater than full scale. Nominal capture level should be in the area of 50% full scale or less.

Functional Block Diagram of the PEAK switch settings

graph TD
    A["3700 Main Unit's Signal conditioned Analog Signal (0 - ±5 or ±10 Vdc)"] --> B["FAST"]
    B --> C["Switch #1"]
    C --> D["MODE Selection Switch #2 & 3"]
    D --> E["PEAK Option"]
    E --> F["TARE Switch"]
    F --> G["BACKOUT Level for Peak Detect"]
    G --> H["Threshold Potentiometer"]
    H --> I["LIVE Value"]
    I --> J["Switch #4"]
    J --> K["Switch #6"]
    K --> L["3700 Display"]
    M["Front Panel TARE Switch Push - Push"] --> N["NORMAL"]
    N --> O["Switch #5"]
    O --> P["PEAK-TRACK"]
    P --> Q["Switch #7"]
    Q --> R["1% Backout Level for Peak Detect"]
    R --> S[".1%"]
    S --> T["Threshold Potentiometer"]
    T --> U["PEAK Value"]
    U --> V["NEAR"]
    V --> W["Analog Amplitude Level"]
    X["PEAK Analog Output (0 - ±5 or ±10 Vdc)"] --> Y["NEAR"]

3. PEAK Interface I/O Connections

Pin assignments for the 3700P board's 8-pin I/O connector (shown in Fig. 1) functional description

Pin Number
Function

1	Output	HAVE PEAKOutput Logic Signal, indicates a Peak has been detected.
2	Input	TRACK or PEAKInput Logic Signal to Clear (Track) or to Arm for a Peak capture function
3	Input	TRACK or HOLDInput Logic Signal to HOLD the Peak reading. Must be in Track Mode to clear Peak (Pin 2 false, not grounded)
4		LOGIC COMMONCommon for Logic signal activation
5	Input	DISPLAY - LIVE or PEAK ReadingInput Logic Signal to select Live Reading or Peak Reading for front panel display
6	Input	FRONT PANEL TARE for Display of PEAK or LIVE signalInput Logic Signal to use the front panel TARE switch for PEAK or LIVE display reading
7		ANALOG COMMONCommon for analog signal reference
8	Output	PEAK ANALOG SIGNALAnalog Output - Holds PEAK analog value when in PEAK mode; follows analog input continuously when in TRACK mode. Full scale level is determined by the 3700 main units output selection - +/- 5V or +/- 10V.

4. Setup conditions for the "P" option and TARE switch operation

When the "P" option is installed - the front panel "TARE" Push/Push switch can be configured to operate in three separate function modes for local operation depending on the DIP switch selection and/or logic inputs selected.

Function Mode of the TARE switch

1. Standard "TARE" capability for normal operation - Will TARE the input measurement of the analog signal and the display to "Zero". LED will light GREEN when active and within normal offset TARE range. Remote TARE via the rear connector functions in a similar fashion.
2. PEAK capture or Track mode - When the TARE switch is depressed, the meter will be in "track" mode following the input signal amplitude. When the TARE switch is released (outward position) the meter is armed and ready to capture the Peak as configured by Dip Switch 2 & 3.
3. Used for local control of the Front Panel display -TARE button depressed will display the PEAK reading. Outward position of the switch will display the "Live" reading. Switch action will not perform a Peak reset operation, this must be done via connection terminal 2's activation for TRACK - PEAK.

Note: If the Peak option is installed in a Model 3740 Frequency conditioner, the TARE mode switch functionality is only accessible via the rear logic connector input

Function Mode Setup and configuration details

1. Standard TARE operation Default condition

- Dip Switch 4 & 5 UP, Peak Input connection Pin 5 and 6 are not used. Remote connections for remote TARE are available. Refer to the main meter manual for details.

2. Front Panel Peak Reset Function

- Dip Switch 4 & 5 DOWN or Switch 4 DOWN and Input connection Pin 5 Grounded (True). Input connection Pin 6 can not be used. Remote TARE function operates via main meter connector.

3. Local Display of Live or Peak Reading

- Dip Switch 4 & 5 UP, Input connection Pin 5 not utilized, Pin 6 is grounded (True). Remote TARE function operates via main meter connector.

4. Interface I/O Connections

Interface Connector Operation

The 8 pin rear connector provides remote access to the Peak operational parameters. All logic I/O are negative true signals - logic common when active or true.

Functional diagrams of the logic for enabling PEAK functions are shown in Fig. 3 thru 6. Typically usage of the I/O connections are for remote control of the application sequence to "handshake" with a controller for proper operation of the measurement capture and resetting process of the PEAK Mode function.

Display Source and Front Panel TARE button mode of operationl are available to provide remote control enabling of the local operation of the 3700 Peak features as configured by the 7 postion dip switch settings as described in section 2.

Analog Output of the PEAK Mode function is available. The Analog level is dependent on the configuration of the main analog controls of the 3700 unit... +/- 5 V or +/- 10 Vdc full scale level. Analog output, when in the HOLD or PEAK capture mode, is accomplished using capacitive memory and will have a "leak" rate of 1 millivolt per 10 seconds.

Fig. 2 Track/PEAK Via External Command (Switch, Open Collector Transistor, or TTL Logic)

2 (TRACK) 4 (COMMON)

2 (TRACK) 4 (COMMON)

graph TD
    A["2 (TRACK)"] --> B["TTL"]
    C["4 (COMMON)"] --> B["TTL"]

+ PEAK Mode - captures and holds the most positive signal amplitude of the measurement within the positive quadrant of the signal. Switch 2 UP - Switch 3 UP

Fig 3

- PEAK Mode - captures and holds the most negative signal amplitude of the measurement within the negative quadrant of the signal. Switch 2 DOWN - Switch 3 UP

Fig 4

MAX + MIN Mode - captures and holds the most positive signal and the most negative signal amplitude in the positive and negative quadrants of the measurement resulting in an absolute analog output signal. Switch 2 UP - Switch 3 DOWN

Fig 5

Note: When in Max-Min mode the analog signal may overrange due to the summing of the + Peak and - Peak captured signal.

TIR Mode - captures and holds the most positive signal and the most negative signal amplitude in the positive quadrant of the measurement. Switch 2 DOWN - Switch 3 DOWN

Fig 6

Threshold Level Adjust and Have Peak Detection (Backout)

Switch 6 - PEAK THRESHOLD DISPLAY ADJUST on the rear panel dip switch: When in the DOWN position, will switch the front panel display to provide level adjustment of the Threshold Potentiometer to provide a "No Peak Zone" around the Zero level. This adjustment is used to eliminate false Peak Captures around the zero measurement level as shown in the gray area of the Fig. 7 below. Adjustment is from 1 to 8% of the full scale reading.

Switch 7 - HAVE PEAK DETECT (Backout): Selects the amplitude of the "delta" between the live signal and the detection of a Peak value which has occurred. Sometimes referred to as "Backout" as shown in the circle graphics below. This level sets the recognition level of when a PEAK has occurred. Level is 0.1% (DOWN) or 1.0% (UP) of full scale. Setting will depend on signal dynamic content and the sharpness of the peak event. Placement of Switch 1 (Analog Signal Source) will also have an affect on this setting due to the analog filtering response of the FAST or the SELECTED analog signal as determined by the response time of the FAST signal for the 3700 Model or the Select Analog Filter per the Analog Control switches located on the main 3700 unit.....switch 3 & 4.

Fig 7

graph TD
    A["Input"] --> B["Threshold Adjustment – Peak Defeat Zone (1-8% FS)"]
    B --> C["Output (+ PEAK)"]
    D["+ Full Scale"] --> E["Switch 7 Backout Level"]
    E --> F["Have PEAK Detect"]
    F --> G["0.1 or 1% Full Scale (Switch 7)"]
    G --> H["Output"]
    I["ZERO Level"] --> J["Switch 6 for display adjust level"]
    K["Logic Inputs"] --> L["Track / HOLD"]
    M["Logic Output"] --> N["Have PEAK"]
    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:#cff,stroke:#333
    style F fill:#ffc,stroke:#333
    style G fill:#fcf,stroke:#333
    style H fill:#cff,stroke:#333
    style I fill:#fff,stroke:#333
    style J fill:#fff,stroke:#333
    style K fill:#fff,stroke:#333
    style L fill:#fff,stroke:#333
    style M fill:#fff,stroke:#333
    style N fill:#fff,stroke:#333

Quick Set-up operation

1. Determine the Peak Mode required

Configure switch settings 2 and 3 for the proper function.

2. Select FAST or SELECT signal source

Configure switch 1 - FAST will be the highest dynamic capture. SELECT will reflect the low pass filter selection on the main 3700 Analog Controls.

3. Select the Front Panel Operation of the TARE Switch

Configure switch 5 - Normal operation of the TARE switch to provide "zero-ing" of the analog signal or to use the TARE switch as a front panel PEAK -TRACK "push-push" operation to place the 3700 unit is PEAK capture Mode or Reset the PEAK that has been held resulting in the display and analog output signal tracking the live input. Push IN - PEAK. Push OUT - TRACK.

4. Select the Operation of the Display

Switch 4 - Meter display can be configured for LIVE display or the PEAK capture value. If the unit is a "stand-alone" meter with the local operator providing the Peak Reset, as mentioned in step 3, then Switch 4 should be DOWN for PEAK display operation. Remote control of the display can also be done via the I/O connections with an external switch or controller providing the Display control function.

5. Determine how much "threshold" level is needed for your application

Switch 6 will display the threshold value (1 to 8%) for a bi-polar "no peak detection zone" around the Zero measurement level. This adjustment is normally in the 5% area, but can be adjusted depending on the application and how much PEAK defeat / rejection is needed. When finished with the potentiometer adjustment, return Switch 6 to the UP position.

6. Determine the need for remote control of your application

Refer to the Connector I/O interface in section 3 for setup functions of the 8 positon terminal connector. Switch function 4 and 5 can be remotely controlled. All other switch settings are typically configured during initial setup of the 3700 unit and will not be changed.

Peak Capture Response

The Peak Capture of the analog signal is performed using “capacitive” memory. This technique is very repeatable and does not involve digital sampling errors. It does, however, result in a millivolt/second “leak rate” after the initial “capture” which varies depending on the Peak Capture cycle rate, amplitude of the analog signal and the wave shape of the signal being monitored. Below are the leak rate values as expressed in percent of full scale using defined parameters of a single square wave pulse input of 1, 10 and 100 milliseconds in duration at the full scale value of 5.000 V.

Square Wave Full Scale Error after Peak was captured

Pulse Width	10 mS	100 mS	1 Sec
1 mS	0.10%	0.15%		0.20%
10 mS	0.05%	0.07%	0.10%
100 mS	0.02%	0.02%	0.06%

Typical Leak rate graph with a 100 mS pulse example

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