Products > Test Equipment

Cheap and Small Dynamic Signal Analyzer?

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gigavolt:
I was watching Dave's new video on magnetic field shielding and I realized: why haven't I seen any cheap hobbyist grade DSAs on the market?  Up at high frequencies there's the nanoVNA which is dirt cheap and fits in my pocket.  I'd expect that a DSA which is basically just some nice ADCs with the right software would be a prime candidate for creating something in a similar vein.

Right now I'm actually using an audio interface and some custom software for rooting out noise, but it all feels really hacked together and having something that you just plug in and take a measurement with would be amazing.

Vgkid:
Maybe a quantasylum qa401.

gigavolt:
Wow, that's a cool piece of kit.  I don't think I've seen audio gear that goes all the way from 2 Hz to 70 kHz before.

maxwell3e10:
Surprisingly there doesn't seem to be a new instrument-grade low-frequency spectrum analyzer. You can pay Standard Research Systems $10k for a brand-new CRT display device similar to what Dave was using, or get them used.  Audio hardware is nice and inexpensive, but doesn't have the full functionality, for example measurements below 1 Hz.

David Hess:
Dynamic signal analysis and low frequency network analysis are pretty specialized and generally have no use for portable instruments.

Some 384 kSample/second PCI audio cards support input and output bandwidth to 96 or even 192 KHz but low frequency performance is questionable.

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