Products

Description

The Model 665 is a combo computer-controlled static/dynamic strain gage amplifier module. The following parameters are displayed and are adjustable: gain, zero, external cal, filter, excitation and excitation monitor. Each channel has its own isolated constant current excitation source.

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

AC gain settings: Fixed log steps 1, 2, 5,10, 20, 50, 100, 200, 500, 1000, 2000, 5000

DC 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 120Ω and 350Ω 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

                                   Model 665 module

         Model 5020-102 rack with power supply