1102 strain gauge

[Peter W Brown]

I am using a sxci-1000 chassis with a 1102b module with 1303 terminal block. Trying to measure a 120 ohm strain gauge using a quarter bridge completion board with external excitation and a pot used to balance the bridge.

At the moment I am using an excitation of 4 volts and pick up a voltage of 2 volts on the input channel of the 1102. Now my understanding is that I would have to reduce the output voltage to less than 100mV to apply a gain of 100 on the 1102. Without the gain, the module won't have a high enough resolution to acquire any change in strain.

Any suggestions?

Would I have to null the voltage prior to reaching the 1102 module?

I assume the gain of 100 won't work if I have an input range of 1.9 to 2.1V, but has to be -0.1 to 0.1V.

Is it possible to read strange gauges on a 1102b this way? Would I have to use strain gauge amplifiers?

Thanks for your help. I am pretty new to using strain gauges but understand the bridge completion.

[Peter W Brown]

I think I had wire wrongly connected. Seems like I was measuring across the strain guage which explains the 2V. I now get 0V reading on the channel and can apply the gain of 100. Seems to be working correctly but will test with a datataker to ensure the correct values are being recorded.

Sorry for jumping in too soon on the forum.