04-24-2014 12:00 AM
Hello Master's of LabVIEW!
Currently I am doing a project which involves PXIe-5665. My task is to make a driver for this module and attached some dataloggin functions. I already done most of the functions (thanks to RF Demo Panel example), however, I need to implement VBW settings, which I cannot find.
Does anyone here done VI for VBW setting?
Thanks in advance!
Dennis
Solved! Go to Solution.
04-24-2014 10:17 AM - edited 04-24-2014 10:18 AM
The PXIe-5665 is an FFT based analyzer and therefore doesn't actually have a real VBW setting. Video bandwidth is a hold-over concept from swept-tuned analyzers where a filter would be applied to smooth out the spectrum on the display. I believe that most digital analyzers made today use a digital filter to represent VBW. You can accomplish a similar thing in RFSA by adjusting the averaging settings.
Here's a link to some information about video bandwidth: VBW on Wikipedia
04-25-2014 10:22 AM
Hi Denshie,
You can find an example for VBW at the following link:
NI-RFSA Soft Front Panel Measurement Examples
https://decibel.ni.com/content/docs/DOC-22813
Also, if you are interested in more details on the emulation of VBW on the PXIe-5665, you can check out the following link:
Emulating Video Bandwidth and Detectors in an FFT-based Vector Signal Analyzer
04-27-2014 07:51 PM
Hello MAtt_K,
Thanks for this! It is very helpful.
Regards,
Dennis