| Products > Test Equipment |
| Rigol DS1000z/2000/4000/6000 Waveform Capture Utility |
| << < (7/10) > >> |
| Bud:
That NI LabView Runtime is finiki. It killed TCP/IP capability on both Rigol's Ultra Sigma and 3rd party RUU programs. USB still works on both after LabView Runtime install but TCP/ IP does not anymore. |
| Bud:
--- Quote from: pa3bca on December 24, 2014, 09:36:44 am ---V2.2.3.1 has the following issues: - If I start out with Long Memory Capture it works. - If I then switch to Realtime waveform, no waveform is shown on the screen (but it does update, the graticules jump in some out-ranging mode?) - Screenshot still does not work. - If I then go back to Long Memory Capture the program locks up and I need to force-close it --- End quote --- This is weird. Here is what I have compared to yours: - I tried starting in Long Memory Capture and it worked just once, subsequent capture does not work displaying just the blank waveform/FFT windows. - If I then switch to Realtime waveform, I can capture static waveform and its FFT, no real time update. Every time I cycle the capture button it grabs a static picture, and the scope screen flickers and says "Invalid data" - If I then switch to Screenshot Capture, I can capture screens no problem each time I press the capture button I also noticed in Real Time capture the FFT displays different spectrum depending on the timescale, which makes me think it is incorrectly calculated or the waveform data it is using is invalid. I have attached 3 screenshots of a same 100MHz signal with different timescale, you can see they all show different FFT data. |
| AlessandroAU:
--- Quote from: Bud on December 24, 2014, 04:48:55 pm --- --- Quote from: pa3bca on December 24, 2014, 09:36:44 am ---V2.2.3.1 has the following issues: - If I start out with Long Memory Capture it works. - If I then switch to Realtime waveform, no waveform is shown on the screen (but it does update, the graticules jump in some out-ranging mode?) - Screenshot still does not work. - If I then go back to Long Memory Capture the program locks up and I need to force-close it --- End quote --- This is weird. Here is what I have compared to yours: - I tried starting in Long Memory Capture and it worked just once, subsequent capture does not work displaying just the blank waveform/FFT windows. - If I then switch to Realtime waveform, I can capture static waveform and its FFT, no real time update. Every time I cycle the capture button it grabs a static picture, and the scope screen flickers and says "Invalid data" - If I then switch to Screenshot Capture, I can capture screens no problem each time I press the capture button I also noticed in Real Time capture the FFT displays different spectrum depending on the timescale, which makes me think it is incorrectly calculated or the waveform data it is using is invalid. I have attached 3 screenshots of a same 100MHz signal with different timescale, you can see they all show different FFT data. --- End quote --- When the number of samples is fixed and the sample rate changes the FFT spectrum changes with timescale. The FFT is a compromise between upper frequency limit and spectral resolution. Especially since here we are limited by the number of points in the display buffer (hence the point of the long capture feature). The graphs looks fine, the fundamental frequency of 100MHz appears to be correctly identified in all cases, which means the scope is downloading the waveform and its info properly. The sub-harmonic in the 3rd image is caused by one of the higher harmonics being aliased back into the 1st nyquist zone. (Due to the jitter issue) |
| Bud:
--- Quote from: AlessandroAU on December 24, 2014, 11:51:47 pm --- Especially since here we are limited by the number of points in the display buffer (hence the point of the long capture feature). --- End quote --- OK if I understand correctly it seems one has to be careful in Real Time screen and not squash the waveform too much so the display buffer contains a quality representation of the waveform, i.e. fits not too many periods of the signal. |
| AlessandroAU:
--- Quote from: Bud on December 25, 2014, 01:15:49 am --- --- Quote from: AlessandroAU on December 24, 2014, 11:51:47 pm --- Especially since here we are limited by the number of points in the display buffer (hence the point of the long capture feature). --- End quote --- OK if I understand correctly it seems one has to be careful in Real Time screen and not squash the waveform too much so the display buffer contains a quality representation of the waveform, i.e. fits not too many periods of the signal. --- End quote --- This is true, http://zone.ni.com/reference/en-XX/help/372416B-01/svtconcepts/fft_funda/ is a good primer if you wish to learn more. pa3bca, you're running firmware version 2 or something on your scope right? (I'm on 4) The reason I ask is that it is very unusual that screenshot capture does not work for you. The screenshot sub VI I have implemented comes directly from rigol's examples available on their documents page for the ds1000z series scopes. I have found it even worked on my rigol signal generator. Anyway have you considered updating your firmware?, I think it could possibly solve some of the problems you're having. There should be no reason the program behaves differently for you if we have the same series scope. |
| Navigation |
| Message Index |
| Next page |
| Previous page |