Problem with the generation of multi-sinus wavefrom of random phase using PXI-5412

Hello

I am trying to generate random phase multi-sine waveform using the PXI-5412 14 bits 100 M/s AWG on LabVIEW8.0.

The version of LabVIEW8.0 for the PXI-5412 comes with a sample VI on multi-tone waveform generation. When I tried with a different combination of frequency and amplitude, there is no problem with the sample VI.

Because I need the phase to be random for each frequency component, I had tore the tone cluster containing 3 elements, i.e. frequency, amplitude and phase, which feeds the generator of signals, and rebundle the cluster with elements of reading a CSV file by using a loop, a fixed value amplititude and a number of random phase of the frequency generated by a random number (formula lournies elements (: pi - 2pi x r). When the waveform multi-sinusoidale generated on the PXI-5112 100 MHz Digital Oscilloscope, it was pointed out that the waveform would change with the tested frequency range.  However, the amplitude of the wave is always ~1.4V (guess that's always default to 1 V x sqrt (2)).  There is no question also when testing the same combination of frequency and amplitude by using sample VI without modification.

Please find attached the VI of the sample, snatching up to the version and the CSV file I used. Is there something wrong with the table 1 d of the cluster of 3 elements that I built and assembled causing the signal generator to ignore the value of input amplitude and, possibly, the input value of the same phase (as it seems that the amplititude is always set to the default)?

The other question that I found on the two sample VI and ripped version is on the news of sampling.  The waveforms appear on digital Oscilloscope PXI-5112 always default to 10 cycles no matter how changed the sampling frequency and the number of samples.  For example, if the frequency is 10 Hz, sampling frequency is 1000 Hz, and I put the number of samples to 10000.  I'm supposed to get 10000/100 = 100 cycles.  However, I could see 10 cycles no matter how, I changed.  What should be the correct way to change the number of cycles?

Really appreiciate your help and advice. Thank you.

1 phase unit is in degrees (-180 to 180), no - pi pi.
2 standardize Waveform.vi always normalize your amplitude of the signal. You can remove it to use your desired amplitue, but must make sure that it is not above 5412 spec.

Tags: NI Hardware

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