Products > Test Equipment
Please recommend a scope (or other device) purely for audio testing.
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Gary.M:

--- Quote from: blueskull on June 13, 2017, 09:47:25 pm ---
--- Quote from: Gary.M on June 13, 2017, 09:33:02 pm ---The op needs an Analogue Discovery as others have said. Look for one on ebay. You can use the network Analyzer to do what you want. Open loop bode plots?

--- End quote ---

From HpW website:

--- Quote ---...
Various signal analysis are performed like RMS, DR, THD, THD-N and more.
...

--- End quote ---

Also, RMAA is another great software for such purpose.

--- End quote ---
Soundcard based software won't do what the op said he wanted to do.

Sent from my x600 using Tapatalk

uktony:

--- Quote from: Gary.M on June 13, 2017, 10:53:33 pm ---
--- Quote from: blueskull on June 13, 2017, 09:47:25 pm ---
--- Quote from: Gary.M on June 13, 2017, 09:33:02 pm ---The op needs an Analogue Discovery as others have said. Look for one on ebay. You can use the network Analyzer to do what you want. Open loop bode plots?

--- End quote ---

From HpW website:

--- Quote ---...
Various signal analysis are performed like RMS, DR, THD, THD-N and more.
...

--- End quote ---

Also, RMAA is another great software for such purpose.

--- End quote ---
Soundcard based software won't do what the op said he wanted to do.

Sent from my x600 using Tapatalk

--- End quote ---

Indeed - I already ahve RMAA PRO and Audiotester. I also use Realtime Analyzer from here -> http://www.ymec.com/products/app/ra2.htm

All of the above are good software, but are still limited by sound card bandwidth of course.

HpW (very, very quirky and difficult to navigate) was evaluated, however that too would still be constrained by the limits of the sound card bandwidth.

Finding a used Analogue Discovery has proven to be difficult, as I guess people don't part with them in a hurry (even the first version).

The QA401 from QuantAsylum was also looked at, but again it's way over my budget.

I started this thread with the idea that someone might suggest something I've never heard of, or perhaps even a method / device I had not even considered.

But evidently I think I had considered all options!

uktony:
I was recently reminded of this thread so thought I should update it.

Six years later (six!) I have learnt a lot.

The Tsunami device I mentioned in my earlier posts turned out to be quite useless. I guess I was expecting too much.

A typical (affordable for a hobbyist!) digital scope is 8 bit or 12 bit, neither of which are much use for high resolution audiomeasurements.

I purchased a used Handyscope HS3 https://www.tiepie.com/en/usb-oscilloscope/handyscope-hs3 from 'TiePie' which has a 16 bit resolution mode with limited bandwidth (up to 200kHz from memory).

This has proven to be quite useful for tracking anomalies like oscillation etc.

But for measuring THD, SINAD and various other parameters, one really needs 24 bit, which means using a PC with sound card.

I purchased an Asus Xonar STX and using Wavespectra and Virtins Multi Instrument I am able to achieve some really useful measurements.

I created a dedicated page for audio test and measurement on my website for those interested. https://gtkc.net/audio-test-and-measurement-for-diy

I've attached a screenshot of a typical measurement.

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