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

--- Quote from: uktony on June 12, 2017, 04:30:39 pm ---I have been experimenting with wideband preamps, along with HF distortion caused by bandwidth limiting.

--- End quote ---

Why would bandwidth limiting cause HF distortion?

Signal theory says the exact opposite - that bandwidth limiting is good!

Having said that: I'll second the Analog Discovery. It has the right combination of ADC bits, bandwidth, function generator and software for this sort of work.
uktony:
Well I found what must be old stock of the Tsunami - https://www.crowdsupply.com/arachnid-labs/tsunami

Which I'm hoping will do exactly what I want - https://github.com/arachnidlabs/tsunami-arduino/wiki/Measuring-Frequency-Response

It was £88 which was a bit pricey for what it is (was $60 at launch) but I'll report back if it's any good, although they don't seem to be available any more.

It doesn't have to offer 100% precision for my purpose anyway.

And most important of all it was comfortably inside my budget and leaves me with some pocket change to buy other goodies.

Thanks to all those who contributed - as I said in my opening post, I just wanted to be sure I hadn't missed any options.

Oh, and I take on board the comments about wide bandwidth - I just like to see exactly what my circuits are doing, regardless of total bandwidth - and this tool will just be a supplement to measurements made with PC software and Focusrite.


DaJMasta:
I think part of the bandwidth point is that while it's interesting to see how they will perform at extended ranges, they will perform worse because of extending their range.  Widening the bandwidth of an audio circuit beyond the range you can hear artificially raises the noise floor, even in the audible range, even though you can pass through those components above the hearing threshold.  So to get the best noise performance, you generally want the smallest bandwidth you can afford.

At some level it's counter-intuitive, but it's how bandwidth works - the more you can narrow it down, the lower your noise will be in the area you are looking given the same inherent hardware noise.
egonotto:
Hello,

uktony wrote:
"
So what would I like:

    FFT / bode plotting
    Downloadable data
    Linux compatibility would be nice (to enable scripted testing)
    An onboard DDS generator
    USB connectivity *or* a method to store data (if not a USB scope)
"
When I understand correct the tsunami is essential a DDS-generator.
The input has only 15KS/s.

I think the Analog Discovery is best to fit your demand.

Best regards
egonotto
f5r5e5d:
for amplifier circuits for audio, whether op amp or discrete, stability verification requires 10s of MHz viewing BW at the least
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