07-31-2007 11:00 AM
07-31-2007 11:24 AM
Comparing DAQ readings with a meter can be tricky for a lot of reasons. To begin with, what is your sample rate and period? Because the signal you're reading is an AC source it's level is constantly varying (at a 400 Hz rate ). Hence, you need to sample enough of a waveform that you can calculate the appropriate AC parameter (peak-to-peak, RMS, or what have you).
Also remember that meters always have a certain amount of built-in hysteresis or dampening to make the output easier to read.
Mike...
08-02-2007 01:53 AM