I want to measure current being used by a 12V inverter. I have bought a
200 amp shunt and a labjack usb daq box. The problem I am having is that the measured voltage across the shunt keeps jumping all over the place. The reason being that the current to the inverter peaks 50 times per second and the labjack is taking the measurements at different random points on the sine wave. I can take, say, 250 measurements per second and average them but that seems kindof overkill and will introduce timing problems when windows starts doing unnecessary crap. I tried putting a cap across the shunt but that had little effect. Is there something I can do to smooth out that voltage? I notice the volt meter gives a nice smooth reading that is exactly what I would expect.Thanks in advance, Michael