Hi, I am trying to control the SR780 network analyzer with LabVIEW to give a signal from its internal sinusoidal source and get the corresponding FFT into the LabVIEW vi. I connected the device successfully with a GPIB cable, but the FFT frequency axis is not displaying the frequency as in the SR780. I tried x axis multiplier with (sampling freq/fft lines = 262kHz/400) as given in the manual for SR780. This scaling method worked well for a vi with FFT spectrum in LabVIEW with an internal sine wave.
The FFT frequency axis in LabVIEW does not correspond to that of the device, and the frequency component is also not at the source frequency. The SR780 sampling rate is 262kHz, has fft line options(100,200,400,and 800 and 400 preferred), it takes 3.91ms for full span (DC to102.4KHz) spectrum.
I would like to help to format the axes of the FFT display in LabVIEW to match the SR780 device display.
The vi require
SR78x series drivers and NI-VISA for the GPIB cable.
I am attaching the vi as well. I really appreciate any help on this regard.
