I need to monitor a square wave signal using a PXI-6221. Currently I'm using it to take a 500000-sample waveform, which is then sent to 'Extract Single Tone Information' to find the frequency. The frequency is then written to a spreadsheet file.
At first I used this VI with the PXI-6221 in a PXI-1000B with a PXI-8156B controller. The VI I'd wrote to perform the above tasks was saved as a LV 7.1 executable. There were no errors reported while the VI executed and the ~3 kHz frequency was evaluated to ~20 Hz. Then I decided to use the exact same VI and card in a PXIe-1065 chassis using a MXI-Express bridge to a PC. Suddenly, whether I was using a LV 7.1 exe or the same VI saved under 8.6, 8.0, or 7.1, I was given the same error whenever the VI reached the point where it had to evaluate the frequency of the signal : 'waveform dt parameter <=0'.
-The PXI-8156B is a 233MHz processor running Win.NT.
-The PC is a relatively new model running Win XP.
-When I access the PXI-6221's test panel and run the test manually, I see a set of square waves appear on the graph as expected.
-The exact same error occurs when I substitute a PXI-6259 for the PXI-6221.
-The voltage of the signal moves between -5 and 0 V.
-When a different frequency analysis VI is used the same problem occurs.
