Electronics > Beginners

Which Spectrum Analyzer Measures Very Low Frequencies?

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innkeeper:
that is certainly a job suited for a DSA.
I saw MasterTech posted a nice list of DSA's but search DSA or Dynamic Signal Analyzer, and you will find many.
spend some time reading the manuals for them.
HP has a nice application guides and notes too for DSA's that can help you with your specific application, search for those as well.

JohnnyMalaria:
Why not get an inexpensive ADC and then write some code? I use Python with the Numpy numerical library (all free) and its FFT is insanely fast. For the frequency range you want you can easily achieve real-time processing and the Matplotlib graphics library is very capable. With that combination of software and a tremendous online following, you can achieve great results with just a handful of code. You'll need an ADC with Python support. Mine is from https://www.mccdaq.com/data-acquisition/low-cost-daq - they provide a great Python library. You can capture, FFT and plot in less than a dozen lines.


FYI, a problem with solutions using a PC soundcard is that there's usually a low frequency cutoff at 10-20Hz which may be an issue.

2N3055:
PicoScope 4262.
You can do FFT up to 1 Mpoints in provided software, and also have API to write your stuff (Visual studio, Python, Matlab).
Top notch instrument for what you need.
Regards,

Sinisa

Lee Leduc:
Take a look at the Digilent Analog Discovery 2.
https://store.digilentinc.com/analog-discovery-2-100msps-usb-oscilloscope-logic-analyzer-and-variable-power-supply/

Has a spectrum analyzer that may fit your needs.
https://reference.digilentinc.com/learn/instrumentation/tutorials/ad2-spectrum-analyzer/start

I use it in the lab for teaching Analog Op Amps. Very nice little tool for the price.

innkeeper:
It really depends if he is looking to do more experimentation with stuff, and roll his own, or play with various gear that might work or be writing his own custom code and debugging that OR if he is looking for a new tool that will give him the data he needs to do the task at hand. This dosnt seem like an application where someone wants to deal in maybe's

It seems to me he is looking for the latter.  Cost wise, yea some of the options could be cheaper in capital outlay, but once you factor in your time, probably not so cheap.

In my own personal experience, I was able to acquire a nice OLD 2 channel DSA with a GPIB port, and an NI GPIB  to USB adapter pretty cheap, and frankly has paid for itself 10 times over in time savings. It has its place.

The other thing is that if you investigate other documented issues and testing of such issues, they will most likely be talking about DSA functions, analysis and results. Past research for such things was most likely done with DSA's

a DSA with 2+ channels is really the way I would go for all the above reasons, and if you need to go cheap, get one off ebay that's backed by someone reputable.

again, not that you cant get away with doing it other ways, but, you will always be fighting the equipment to get it to do what a DSA does out of the box..
 





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