Error in Wheatstone Bridge User Guide
Posted: Fri Mar 23, 2018 12:43 pm
I have the wheatstone bridge phidget. If I connect a bridge with a fairly big output span ~ 20mV/V, I am getting saturation warnings from the phidget control panel for that channel when I look at the output and squeeze my load cell. The problem is, for 64x and 128x they are off by an order of magnitude.
The user guide here: https://www.phidgets.com/docs/DAQ1500_U ... al_Details
says that the range should be ±78.125 mV/V and ±39.063 mV/V for 64 and 128x gain respectively. I am finding it to be 7.8 and 3.9 mV/V. Sure enough, if you apply a gain of 128 to the unamplified range of 500 mV/V you get 3.9 mV/V...
Seems like an error to me.
The user guide here: https://www.phidgets.com/docs/DAQ1500_U ... al_Details
says that the range should be ±78.125 mV/V and ±39.063 mV/V for 64 and 128x gain respectively. I am finding it to be 7.8 and 3.9 mV/V. Sure enough, if you apply a gain of 128 to the unamplified range of 500 mV/V you get 3.9 mV/V...
Seems like an error to me.