Cooper Instruments & Systems DCM 460 Voltage Bridge Amplifier - Manual (Page 3)

CF 28 3 4/2001
C. Turn on the AC source supply to the DCM 460.
D. Set the required EXCITATION supply voltage to the load cell by adjusting B+ ADJUST.
III. Calibration Procedure for Zero Voltage Adjustment
A. Jumper the + and - input terminals, pins 8 and 9, together.
B. Connect a voltmeter across the output, pins 11 and 10.
C. Adjust the COARSE OFFSET and the FINE OFFSET potentiometers for the desired ZERO voltage.
IV. Full Scale Voltage Adjustment
A. Remove the jumper between the + and - input terminals and apply a known load to your load cell, in
most cases it would be 100% of full scale.
B.
Adjust the COARSE GAIN and FINE GAIN potentiometers for the desired FULL SCALE output.
C. Calibration is now complete. However, the user should recheck the ZERO & FULL SCALE voltage
output before continuing.
Figure 2. Safe Operating Curve
Figure 3. Typical Bridge Application
Transducer Excitation
Transducer bridge excitation is provided by an AC line powered, adjustable, well regulated, low noise power supply.
The excitation voltage is adjustable by means of a molded-in potentiometer which allows the output voltage to be
varied from 4 to 15 Volts. The output ripple is extremely low and the line and load regulation are 0.05%.