Bridge Balance; Gain Control - dacell AM-1000 User Manual

to the gauge with low resistance, an error in measurement can be occurred since
the joule heat might be generated on the gauge. So the most suitable condition
should be found since the resistance on the gauge and proper voltage are very
important. In addition to the gauge with high resistance (over 350Ω) or the long
and wide gauge, you can increase the proper voltage at the place where the
heat-sinking (aluminum etc) easily can be done.
Please avoid increasing the proper voltage with the gauge below 120Ω or at the
place where the heat-sinking cannot be done such as plastic.
Normally the gauge proper voltage should be 10%~100% of the recommended
voltage from the gauge.
Maximum Metallic (foil) gauge can be normally 50% ~ 75% for the stability and
good S/N (signal to noise).
Exclusive voltage should be applied for the semi conductive gauge.
To control the sensor proper voltage of the amplifier, please turn the bridge
voltage switch.

4-9. Bridge balance

Generally, when the bridge balance is too much out, you cannot carry out the
measurement for the wide range since the measurement value will be clipped.
Also you should compensate the bridge balance since a damage can be made on
hardware.
For the compensation, please press the Auto switch on the front side of amplifier
then "Auto" will be lighted on the voltage LED to calibrate the balance
automatically.
Please control the volume for the rest output voltage to set Zero.

4-10. GAIN control

Firstly, please turn the gain switch in a clockwise to set (X1, X10, X100, X400,
X1000) gain.
Or you can turn 10-turn volume so that you can control gain (X1 ~ X11).
The gain noise is originated by input voltage. So when the input voltage is
increased, the noise will be increased accordingly. So please set the gain
according to the size of sensor.
While you are carrying out stress analysis, please compensate as following so that
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