simulate AC coupling in software

[lmd2]

we have a system that measures and records up to 112 accelerometers (that employ excitation). the system works fine but most of the sensors have some DC offset (all different). My suggestion was to take a quick scan of the channels prior to arming the trigger, calculate the zero offset for each channel and then apply that offset to each channel during the measurement. The client thought this sounded too involved and thought there may be a function that can be applied to the array of waveforms in a similar manner as applying a Butterworth filter. I have never run across such a function and thought if such a thing exists the community may know about it...

Anyone? 

thanks,

lmd2

[Coq_Rouge · Accepted solution]

If the DC offsett is stable during a trail. I would say the best thing will be to make a calibration ruotine. Like you suggested. Because this will not degrade the signal in any way. If you apply a digital (or analog) filter you will get problems like phase dealy, step response, settling time.

If your system is BNC based perhaps a DC block like this may be the solution. But this will depend on your signal characteristic. And they can be quite expensive

 

[lmd2]

I have used 'local' zero offsets on other projects, just wanted to confirm that I was not missing something prebuilt out there.

Thanks,

lmd2