MODEL 635-004 STRAIN GAGE AMPLIFIER ASSEMBLY
Features
- Versatile switch selectable modes
- Auto bridge balance with battery backup
- Separate DC channel
- Isolated excitation source
Description
The Model 635-004 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 and manual
bridge balance and many other conveniences, all combined in one moderately
priced module. The -004 version mounts ten channels in a standard 19"
wide rack by moving the power supply under the modules.
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 connector provided
for voltmeter
Bridge balance: Front panel switch, rack pushbutton, or remote
control activates automatic bridge balance cycle; LED indicates unbalanceable
condition; Balance switch selects internal autobalance or manual balance
trimpot
Operating modes: Switch selects AC coupled, DC coupled, Zero,
DC cal or External cal signal
| Gain: |
Main
channel
|
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 250kHz, with switch selectable 3-pole active filter at
1Hz, 10Hz, 100Hz, 1kHz, and 10kHz -3dB frequencies
AC coupled low frequency rolloff at 10Hz |
|
DC
channel
|
DC to 10 Hz |
| Calibration: |
Shunt
cal
|
Activated by front panel MODE switch or remote command; front
panel R CAL switch selects one of four internal calibration resistors;
toggle selects + or - bridge resistor to be shunted |
|
External
cal
|
Activated 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 |
Test points: Front panel two-pin Twin BNC connectors (Amphenol
31-2225) monitor bridge signal, bridge excitation, and amplifier output
Output limit: Front panel LED lights if output signal exceeds
1V RMS
Output noise: 2.5 microvolts RMS RTI max, DC to 10kHz at
G=1000
Power: Model 858 rack-mounted power supply module provides
unregulated ±24V, plus unregulated isolated supply for bridge
excitation
Mechanical: 19"W x 10.5"H x 14"D, 10 module rack adapter,
Model 4023-102
Carrying case: 2 module (8.75" high) desktop case, Model
4025-102
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