Hi all:
I meet a serious problem about lowpass filter of SCXI-1102. sorry to post this question again, but it is really emergency, we have to catch up the deadline.
Actually, I want to use PCI-6040E + SCXI-1102 + SCXI-1300 to test rising edge of pressure signals. Now the problem is that I can not get the right rising edge signals. The corresponding screen capture pic are attached below. The first pic is showing the rising edge measured by other two DAQ equipment (Dactron and HP oscilloscope). the second pic is the signals from NI DAQ equipment.
It seems, the oscillation of signals are realized as noise by low pass filter of SCXI-1102??
In the Pic, the frequence of oscillation is less than 100hz, and the cut-off frequency of Scxi-1102 is 2HZ, (to reject 60HZ).
Is my problem somthing about this??
Thanks s lot
Wei
