I have labview 7.0, pxi-1042, pxi-6070E, scb-68, and windows xp.
I am trying to differentiate an analog signal. I create a square wave with the arbitrary signal generator with slow rising and falling edges. From 0 to 1 seconds, my voltage rises from from 0 to 4 volts. From 1 to 2 seconds, my voltage stays at constant at 4 volts. From 2 to 3 seconds, my voltage falls from 4 to 0 volts. from 3 to 4 seconds, my voltage stays at 0 volts. And then the signal repeats. This signal is an analog output. I take this signal and inject it back as an analog input. This is to test the system.
Using the NI-DAQ time domain math differential, I do not receive a continuous waveform response. I expect a continuous wav
eform pulse during the rising and falling edges otherwise zero.
It looks like I am receiving discrete points which approximate the pulse signal response I desire. In other words, the differentiator function gives me points at finite sample periods which are random (no set pattern to the sample points). Anyway to overcome this in the NI system? Do I have to go with a hardware approach using an R and C configured like a high pass filter?