MODEL 635 / 635M STRAIN GAGE AMPLIFIER ASSEMBLY
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Features
Description
The Model 635 strain gage amplifier exhibits the performance characteristics and controls derived from 20 years of customer-oriented experience. It features very low output noise, broad-band response, auto bridge balance and many other conveniences, all combined in one moderately priced module.
The Model 635M adds extendced range, autobalance and RMS output.
Specifications
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
Operating modes: Switch selects AC coupled, DC coupled, Zero, DC cal or External cal signal
Gain: Main
channelFront panel switch selectable gains of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000 with gain vernier DC
channelBoard-mounted jumper selectable gain of 1, 100, 200, 500
Frequency
response:Main
channelDC to 100kHz, with switch selectable 3-pole active filter at 200Hz, 500Hz, 5kHz, 16kHz, and 32kHz -3dB frequencies
AC coupled low frequency rolloff at 10HzDC
channelDC to 10 Hz
Calibration: Shunt
calActivated by front panel MODE switch or remote command; front panel switch selects one of four internal calibration resistors External
calActivated by front panel MODE switch or remote command; signal applied to rear panel BNC is connected to amplifier input
Signal outputs: Main: ±10V max, 100mA peak load Tape: ±10V max, 5mA peak load DC channel: ±10V max, 10mA peak load 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, plus unregulated isolated supply for bridge excitation
Mechanical: 19"W x 7"H x 14"D, 7 module rack adapter, Model 4007-137
Carrying case: 1 and 2 module desktop cases, Model 4009-107 and 4010-111
Special version: 19" rack with connectors for 635M RMS/DC output, Model 4007-137M
Special version: 19" rack with connectors for 635S internal cal/switch module, Model 4007-135