synchronized digital waveform generation LabView7.1

[vvdeva00]

We have LabView 7.1 and a NI DAQ with two PXI-6115 cards and a PXI-6070E card. Using these I would like to generate two synchronized "digital" waveforms. Both waveforms are square waves with frequencies of ~ 1 MHz and ~4 kHz, respectively. The voltage levels for the square waves are: Low-level between 0 and 0.8 V and a High Level between 2 and 5 V.  The rise and fall of the low-frequency waveform must be synchronized with the fall of the high frequency waveform. Could you point me to a sample LabView program and/or pertinent literature that I can use to build this application? Thank you.

[Chris_W.]

Hi vvdeva00,

The best way to do this is just to use one of your cards and using both counters you can synchronize two separate counter output frequency tasks. These two frequencies will be "synchronized" in that they will have rising edges at the exact same time every 250th edge of the 1MHz signal. I have written an example program in LabVIEW 7.1 using NI-DAQmx and I have attatched it below. This should help out.

Chris W