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Old 12th February 2014, 07:33 PM   #1
kouiky is offline kouiky  United States
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Default Computer-Based Distortion Analyzers

For a while now, I have been looking at updating to a computer-based electrical signal analyzer. This would mostly be for analyzing frequency response, noise floor, and distortion content of electronics. It would also be nice if it would serve as an oscilloscope, too. There seems to be many freeware programs available and more for sale, but much less information is given on the actual hardware. My concern is that the noise and distortion of the soundcard may be too high. Along with frequency response and scope functions, I am looking to take noise and distortion measurements into the -120dB regions if possible. With this on the table, what I am wondering is if there are low noise stand-alone usb modules built for this purpose that the test probes connect to?
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Old 13th February 2014, 01:32 AM   #2
RNMarsh is offline RNMarsh  United States
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Have you looked at the QA400 used with notch filter, yet?

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Old 13th February 2014, 05:51 PM   #3
kouiky is offline kouiky  United States
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I had never heard of the model until now.
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Old 13th February 2014, 06:23 PM   #4
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go look here: Download
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Old 14th February 2014, 12:23 AM   #5
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If you want to use VA make sure you sign up to the Forum and to get the latest Beta Version.
It is much more stable than the ones you get on the main download page.

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Old 14th February 2014, 12:39 PM   #6
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Quote:
Originally Posted by geraldfryjr View Post
If you want to use VA make sure you sign up to the Forum and to get the latest Beta Version.
It is much more stable than the ones you get on the main download page.

FWIW

jer
Thanks I did not know that, I am using 2011
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Old 14th February 2014, 02:34 PM   #7
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Originally Posted by Nico Ras View Post
go look here: Download
Does the software work with a TI 4222 based ADC (plus USB interface)? Like those from Ross Martin?
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Old 17th February 2014, 02:20 PM   #8
kouiky is offline kouiky  United States
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And that is the other question: What software works with what hardware? There is are tons of programs available but much less mention of hardware to do the actual measuring.
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Old 17th February 2014, 02:47 PM   #9
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Originally Posted by kouiky View Post
And that is the other question: What software works with what hardware? There is are tons of programs available but much less mention of hardware to do the actual measuring.
If you are inputting the data via USB, then the software just needs to know which driver you're using for it, based on what I've used before.
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Old 17th February 2014, 10:53 PM   #10
1audio is offline 1audio  United States
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To get performance you woud ned USB UAC2 hardware and drivers. Thats built into OSX and Linux but not Windows. Whomever you get the interface from needs to provide drivers. it can quickly become a black hole if you are assembling it DIY.

If you are using a desktop system a PCI card may be the cleanest choice. There are several choices for under $200 that will get you pretty near state of the art performance.
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