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[URGENT] USB based spectrum analyzer (oscilloscope) or HP dynamic signal analyzer?

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mr_monster

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I want to get a spectrum analyzer to learn and view charactarictics of various audio shaping circuits (so I'm staying in the DC - 20KHz region). My options are getting a 150$ - 200$ USB based scope that comes with a spectrum analysis software. There are various manufacturers here but the spec. is pretty much the same. The other options is to get an HP dynamic signal analyzer which is as-far-as-I-can-tell a spectrum analyzer for low freq. I am pretty sure the HP can get the job done - it's a non-nonsense piece of gear, however it takes up space, more expensive and in terms of outputting the data for logs and charts on a computer it lacks behind. My question is, can I get away with using a USB based solution? Just looking for a couple of opinions here...
 

godfreyl

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How about Visual Analyser? It's free software that simulates various instruments including oscilloscope and spectrum analyser. Input is through the soundcard of your PC.
 

mr_monster

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WOW that looks outstanding. What about that kit from the magazine? Do you have it?
 

godfreyl

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No, I haven't tried any of it - just remembered seeing it on the web.
 

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