Encore Electronics

MODEL 665 COMBO STRAIN GAGE AMPLIFIER MODULE

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MODEL 665  COMBO STRAIN GAGE AMPLIFIER MODULE

Description

The Model 665 is a combination computer-controlled static/dynamic strain gage amplifier module.  Features include an adjustable gain, zero, external cal, filter, excitation and excitation monitor.  Each channel has its own isolated constant current excitation source.

 

Product Specifications

Specifications

Amplifier channels: Channel A is AC or DC coupled with variable gain and filter
Channel B is DC coupled with two gains and fixed filter
Channel A gain settings: Fixed log steps 1, 2, 5,10, 20, 50, 100, 200, 500, 1000, 2000, 5000
Channel B gain settings: 1 or 100
Gain accuracy: ±1%
AC/DC coupling: Selectable on Channel A only
DC offset: Rack control performs auto-zero at each gain or filter change; programmable offset from -100mVDC to +100mVDC; offset affects Channel A if DC coupled, else Channel B
Frequency response: AC channel: Six-pole Butterworth lowpass, selectable at 5kHz, 20kHz, 40kHz or bypassed; 5Hz highpass, single pole
DC channel: Four-pole Butterworth lowpass at 11Hz
Bridge mode: ¼ bridge, ¼ bridge three-wire, ½ bridge, or full bridge  with 120? and 350? internal completion resistors; EMF mode disconnects completion, balance, and excitation
Excitation: Excitation source isolated from amplifier output common; constant voltage, programmable from 1.0-15.0VDC; up to 100mA available; short-circuit current limited to under 40mA
Bridge balance: Autobalance cycle initiated from control webpage; dual 12-bit DACs apply balancing current to +S leg of bridge; balances on channel A if DC coupled, else channel B
Fault indication: One green LED per channel turns red if amplifier exceeds ±10V; both LEDs turn red if bridge autobalance cannot be completed
Offset: Less than 3mVDC at output
Shunt calibration: One of four precision cal resistors applied from -P to –S
11.88k, 19.88k, 49.00k, 99.00k
Noise: Less than 5µ VRMS RTI, filter in, input disconnected
Memory: On-board EEProm stores serial number, calibration date, etc.
Mechanical: 5.5” x 13.5” board, use with Model 5020-102 rack