MODEL 635 STRAIN GAGE AMPLIFIER
Features
- Versatile switch selectable modes
- Auto bridge balance with battery backup
- Separate DC channel
- Isolated excitation source
Description
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.
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 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 4010-111 |
| Operating modes: | Switch selects AC coupled, DC coupled, Zero, DC cal or External cal signal | |
| Gain: | channel |
Front panel switch selectable gains of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000 with gain vernier |
| Board-mounted jumper selectable gain of 1, 100, 200, 500 | ||
| Frequency response: | 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 to 10 Hz | ||
| Calibration: | cal |
Activated by front panel MODE switch or remote command Front panel switch selects one of four internal calibration resistors |
cal |
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 | ||
| ±10V max, 10mA peak load |