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Spectrum Analyzer recommendation needed: used, cheap & low frequency measurement
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Hgspine:
Hello,

I am looking to spend $500 USD or below. I only need it to look at jitter in a 50Hz square wave for this project.  It can be used, old school, from ebay, but I just want the best one for this purpose in my price range.  I see so many models from HP on eBay.  Not sure what to get.  Also, do I need one with an extended memory option?

Thank you.
awallin:

--- Quote from: Hgspine on September 14, 2019, 08:06:44 pm --- I only need it to look at jitter in a 50Hz square wave for this project. 

--- End quote ---

50Hz and harmonics can be recorded with a sound-card? FFT on the computer gives you the spectrum, and other calculations jitter.
sound blaster x-fi or similar?

the QA product might have all the software ready for you https://quantasylum.com/products/qa401-audio-analyzer
0culus:
You definitely want an audio analyzer and not a spectrum analyzer. Most spectrum analyzers won't even be able to show the fundamental with any kind of guaranteed performance at 50 Hz.
Hgspine:
I prefer a freestanding piece of equipment that does not require a sound card or computer.

Ideally I connect it to the testpoint with the 50Kz square wave and it gives me a numeric readout of jitter.
0culus:
Here's an old thread from 2015 from this site.

HP/Agilent made a range of instruments that were badged "Dynamic Signal Analyzers" that may suit your needs. You'll have to read up on the datasheets...

I'm sure Keysight still has something, but that's going to cost a lot of kilobucks.
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