Instrumentation Amplifier

  • CE
  • TEDS
  • CC-Link



· CC-Link optional available
· High-performance processing (Sampling speed: 4000 times/s, 24-bit AD converter)
· Substantial comparison and Judgment functions (Extra high, high, OK, low, and extra low)
· Analog output (DA)
· Display: -99999 to 99999


The WGA-680A is an Instrumentation Amplifier which can display the physical quantity of an input sensor.

Products table

All display

Instrumentation Amplifier

  • CE
  • TEDS
  • CC-Link
Models WGA-680A-00: AC model No option
WGA-680A-01: AC model BCD & TEDS
WGA-680A-02: AC model RS-232C & TEDS
WGA-680A-03: AC model RS-485 & TEDS
WGA-680A-04: AC model CC-Link

WGA-680A-10: DC model No option
WGA-680A-11: DC model BCD & TEDS
WGA-680A-12: DC model RS-232C & TEDS
WGA-680A-13: DC model RS-485 & TEDS
WGA-680A-14: DC model CC-Link


Channels 1
Applicable Sensors Strain-gage transducers (4-wire)
Compatible Bridge Resistance 87.5 to 1000 Ω
(Up to four 350 Ω transducers connected in parallel.)
Bridge Excitation 10, 2 VDC, selectable
Measuring Range ±3.2 mV/V (Input range including zero adjustment range)
Zero Adjustment Range Within measurement range
(Not retained when power supply interrupted)
Nonlinearity Within ±(0.02% FS +1digit)
Stability Zero point: Within ±0.25 μVRTI/ºC
Sensitivity: Within ±0.01%/ºC
Sampling Speed 4000 times/s
AD Resolution 24 bits
Calibration Actual load calibration
Sensitivity registering calibration
Numeric value registering calibration
Smoothing Functions Analog Filters: 10, 30, 100, 300 Hz
Attenuation: -12 ±1 dB/oct.
Moving average: 0, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, and 2048 times
Min. scale: 1, 2, 5, 10, 20, 50, 100, 200, 500, and 1000 counts
Auto Zero Compensation Zero Tracking (Auto digital zero in the preset range)

Approximated zero compensation:
Indication is made zero when the reading is in a preset range of 0 to 9.
Adding Functions Setting range: ±99999
Original Value Display Functions ±3.2000 mV/V (5 digits)
Accuracy: Within ±0.1%FS
Comparator Functions Points: 4

Registers 4 groups of pattern files (comparative values) and enables switching through setting of functions

 Extra high (HH)
 High (HI)
 Low (LO)
 Extra low (LL)

Setting range: ±99999

Hysteresis: 0 to 99999

Comparison modes: Normal, at hold

High low assignment:
Enables assigning high or low to each comparator.
Judgement Function Point: 1

Type: OK
Hold Functions Digital peak/bottom hold (Without analog peak/bottom hold)

 Arbitrary point hold
 Peak hold
 Bottom hold
 Peak to peak hold
 Interval definition peak hold
 Time specification peak hold
 Interval definition peak to peak hold
 Time specification peak to peak hold

Delay time: 0.00 to 9.99 s

Detect time: 0.01 to 9.99 s
Display Range: ±99999 (Decimal point to be put anywhere.)

Indicator: 7-segment LED
Character height: 14 mm
Colors: Red, green, and orange

Update: 0.12, 0.24, 0.49, 0.98, 1.95, 3.90, 7.80, and 15.6 times/s
(In normal mode)

Modes: Normal/hold

Comparators: 5 points (HH, HI, OK, LO, LL)

Status: 2 points (HOLD, LOCK)
Analog (DA) Output Voltage output: ±10 V (Load resistance 2 k Ω or more)
Arbitrary scaling possible

Current output: 4 to 20 mA (Load resistance 500 Ω or less)
Corresponds to voltage output of 0 to 10 V.

Conversion speed: 4000 times/s

Nonlinearity: Within ±0.1%FS

Setting contents: Display value of zero, display value of full scale
Control Input Points: 3

Types: Zero command, hold command, and reset command

Signal formats: Non-voltage contact signal or open collector (NPN)
 (Capacity: 12 VDC, 5 mA or more)
Control Output Points: 5

Types: HH, HI, OK, LO, and LL

Formats: Open collector (NPN) (30 VDC, 20 mA max.)
Level Test Functions Display of arbitrary values possible

Display additional functions: Disabled, enabled

Setting range: ±99999

Level test: ON, OFF
Power Supply AC Models
 100 to 240 VAC, power consumption: 20 VA or less

DC Models
 10 to 30 VDC, power consumption: 10 W or less
Dimensions 96 W ×96 H ×126 D mm (Excluding protrusions)
Weight Approx. 750 g (Without option)
Operating Temperature -10 to 50 ºC
Operating Humidity 20 to 80% (Non-condensing)
Compliance Directive 2014/30/EU (EMC)
Directive 2014/35/EU (LVD) (AC model only)
Directive 2011/65/EU, (EU) 2015/863 (10 restricted substances) (RoHS)
Standard Accessories Instruction manual (CD-R)
Unit seal
Screwdriver (-)
Optional Accessories AC power cable for 100 VAC  P-23
AC power cable for 200 VAC  P-28
Input cable for NDIS4102 (7 pins) connector (6 conductors)
 U-29 (50 cm)
 U-30 (1 m)
 U-31 (2 m)
 U-32 (5 m)
Input cable for NDIS4102 (7 pins) connector (4 conductors)
 U-33 (50 cm)
 U-34 (1 m)
 U-35 (2 m)
 U-36 (5 m)
Wire mount socket 35505-6000-BOM GF (WGA-680A-04/14)
Branch connector (type-Y) 35715-L010-B00 AK (WGA-680A-04/14)
Termination connector 35T05-6M00-BOM GF (WGA-680A-04/14)

Option Specifications

BCD Output
Output Data:
 20 bits (4-bit×5)
 POL (Minus polarity)
 EOC (End of Conversion)
 Holding section
 Detecting section

Output format: Open collector (NPN) (30 VDC, 20 mA max.)
Input Points: 2 (Hold, Output prohibited)

Format: Open collector (NPN) or non-voltage contact signal
(Capacity: 12 VDC, 5 mA)
Output Rate Approx. 15.6, 31.3, 62.5, and 125 times/s
Output Logic Data logic: Positive logic, negative logic

EOC logic: Positive logic, negative logic

Polarity logic: Positive logic, negative logic
Signal System RS-232C full duplex system
Communication Methods Synchronous
Baud Rate 2400, 4800, 9600, 19200 bps
Bit Configuration Data bits: 7
Stop bit: 1
Parity bit: Odd number
Flow control: None
Signal System RS-485 half duplex system
Baud Rate 2400, 4800, 9600, 19200 bps
Bit Configurations Data bits: 7
Stop bit: 1
Parity bit: Odd number
Flow Control None
Device ID 1 to 99
Applicable Transducers Should have the information according to IEEE template No. 33
(Cable length should be 30 m or less.)
Interfaces Compatible with IEEE1451.4 Mixed Mode Transducer Interface Class 2
Calibration Function Automatic sensitivity registration by reading TEDS data
Version 1.10
Station Types Remote device station
Occupied Stations 1, 2, 4
Baud Rate 10 M, 5 M, 2.5 M, 625 k, and 156 k bps
Slave Stations 1 to 64
Connection Cable CC-Link version 1.10 compliant cables
(3-conductor twisted pair shielded cable)



AC power cables

2-pin plug to 2 conductors, crimp-style terminal (M3)


Length Approx. 2.0 m
Object Product Model WGA-100B, 101A, 120A, 200A, 650B, 680A, 710C, 910A
Others For 100 VAC

3 round-shape terminals to 3 conductors, pre-soldering at the cable tip



Length Approx. 2.0 m
Object Product Model WGA-100B, 101A, 120A, 200A, 650B, 680A, 710C, 910A
Others For 200 VAC

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