Test and Measurement Forum

Spectrum Display Issue

Post any questions you may have about our current range of oscilloscopes

Spectrum Display Issue

Postby larryt40 » Wed Jun 13, 2012 8:26 pm

I understand that the FFT is based on the time domain measurement so I believe my problem lies within the software. I have captured data and recently the problem I am seeing has come up. If I am in Frame 5 of 12 I see the time domain waveform and the expected spectral response. However in frame 6 I see that the data for the FFT seems to be mostly below the -125 dBu range. I have exported the frame in question and see that the spectrum has components below =125 dBu but the time domain waveform is identical to the previous frame.

I can also change frames forwards or backwards and see that at one point in time a given frame will show the expected Spectral content and at other times the same frame will show the view with the spectral content below the -125 dBu power lower limit.

This happens for the latest version of the software as well as the Beta version.
Posts: 0
Joined: Tue Feb 14, 2012 4:00 am

Re: Spectrum Display Issue

Postby Martyn » Thu Jun 14, 2012 8:40 am

Can you post a psdata file "File->SaveAllWaveforms" and we can take a look at what is happening.
Technical Specialist
Site Admin
Site Admin
Posts: 2314
Joined: Fri Jun 10, 2011 8:15 am
Location: St. Neots

Return to USB PC Oscilloscopes

Who is online

Users browsing this forum: No registered users and 0 guests