error offset null

[stefo83]

Hi. I try to take a data of torque on shaft with strain measurment (half bridge system with 2 gages on 45 degrees). Everytime when turn on offset null data starts from 0 and then jump to 80 Nm. The problem is that jump. I dont have any load to have that jump and i dont have prestressed state. I use filtering ( low pass 1hz) to get over the noises in static system. Can anyone help me with that jump problem. Thanks.

[Henrik_Volkers · Accepted solution]

You use a veery low low pass filter .... so start aquisition, wait for the filter to settle, use DC estinate vi on a long datablock and substract that value from the following data (after filtering, or wait again for the filter to settle......)

you will run out of memory

[ValkoA]

Hi!

As Henrik had said, the settling time of your filter is causing the problem. Consider improving the filter and discarding the samples that produce before settling. 

Cheers:

[stefo83]

Thanks for reply. I set AC & DC Estimator VI to show me starting and established values. Then with constan I move all values to zero (any time I wаnt). After that I can start loading to the shaft normaly. What you think for that solution?