Looking to upgrade our LF section and was wondering if anyone has any suggestions/recommendations for a good low frequency range spectrum analyzer. Thanks
How low of frequency? Like sub GHz?
There is an HP 35665A that I feel is a pretty good unit. DC-102 kHz spectrum analyzer for the most part.
I have used and liked the older 85XX series HP spectrum Analyzers. Unless they were periodically realigned about 1/2 of these won't meet spec but many from this series have a self-cal/self diagnostic function which is very useful if you are buying used and want to get an on-the-spot idea of the condition.
I think the low end for these is around 10Khz.
Below that you might be looking at a Dynamic Signal Analyzer.
The HP 3588A and 3589A are still pretty good instruments. I also really like the HP 89441A. It has an LF section. Can't remember bottom frequency specs, but it is a nice analyzer.