Manufacturer of electronic instrumentation including signal conditioners, custom power supplies, computer controlled amplifiers and computer controlled signal conditioning instrumentation.




  • Versatile switch selectable modes
  • Auto bridge balance with battery backup
  • Separate DC channel
  • Isolated excitation source



The Model 635 strain gage amplifier provides the performance characteristics and controls derived from over 30 years of field experience.   Features include  low output noise, broadband response, auto bridge balance and many other conveniences, all combined in a competitively priced module.


Bridge configuration: Quarter, quarter dynamic, half, and full bridges, switch selectable; can also be used as general purpose differential amplifier
Bridge completion: Switch selects either 120 ohm or 350 ohm internal precision completion resistors
Bridge excitation: Front panel adjustable, isolated 1.25 VDC to 15.0 VDC; front panel on/off switch; monitor jacks provided for voltmeter
Bridge balance:

Front panel pushbutton or remote control activation of bridge balance cycle; LED indicates unbalanceable condition

Battery backup retains autobalance setting while main power is off

Output limit: Front panel LED lights if output signal exceeds 1V RMS
Output noise: 2.5 microvolts RMS RTI max, DC to 32kHz at G=1000
Power: Model 843 power supply module provides unregulated ±24V to all modules in rack, plus unregulated isolated supply (one per module) for bridge excitation
Mechanical: 19″W x 7″H x 14″D, seven module rack adapter, Model 4007-137; one- and two-module desktop cases, Model 4009-107 and 4010-111MODEL 635 STRAIN GAGE AMPLIFIER RACK


Operating modes: Switch selects AC coupled, DC coupled, Zero, DC cal or External cal signal
Front panel switch selectable gains of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000 with gain vernier
DC channel
Board-mounted jumper selectable gain of 1, 100, 200, 500
Frequency response:
Main channel
DC to 100kHz, with switch selectable 3-pole active filter at 200Hz, 500Hz, 5kHz, 16kHz, and 32kHz -3dB frequencies
AC coupled low frequency rolloff at 10Hz
DC channel
DC to 10 Hz
Activated by front panel MODE switch or remote command
Front panel switch selects one of four internal calibration resistors
Activated by front panel MODE switch or remote command
Signal applied to rear panel BNC is connected to amplifier input
Signal outputs:
±10V max, 100mA peak load
±10V max, 5mA peak load
DC channel:
±10V max, 10mA peak load
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