Products > Test Equipment
Please recommend a scope (or other device) purely for audio testing.
David Hess:
--- Quote from: Keicar on June 13, 2017, 01:55:37 am ---
--- Quote from: f5r5e5d on June 12, 2017, 07:32:03 pm ---for amplifier circuits for audio, whether op amp or discrete, stability verification requires 10s of MHz viewing BW at the least
--- End quote ---
Absolutely - no need for fancy analysis features at such bandwidth, but you do need a way to see oscillation and ringing at such frequencies - an audio amplifier that's behaving like an RF oscillator will draw excessive current and sound nasty, but detailed analysis at audio frequencies won't reveal the cause of the problem.
--- End quote ---
That is a different problem for which a standard oscilloscope will be more suitable than a specialized low frequency network analyser. There is no reason the same instrument needs to perform both functions although I think it is a tragedy that DSOs which include waveform generators do not support multiple forms of low frequency high performance network analysis.
The CGR-201 that I linked seems to meet all of the requirements and operates up to 5 MHz as an oscilloscope and 10 MHz as a network analyser.
mtdoc:
The Digient Analog Discovery is likely perfect.
12 bit scope with 30MHz bandwidth (using BNC adapter)
10MHz AWG
Network Analyzer
Software with Linux SDK available (I think)
And check out this thread on Jaxbird's excellent audio analysis sotware developed for it.
nctnico:
--- Quote from: ruairi on June 13, 2017, 01:06:03 am ---
--- Quote from: nctnico on June 12, 2017, 10:56:47 pm ---Another option would be to look for a network analyser. Say something which goes from several Hz to several MHz. These aren't cheap (although good deals can be found) but do save a lot of trouble. A network analyser is also useful for various other tasks like an LCR meter. I just wanted to mention this for completeness if it hasn't been mentioned already.
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The 50 ohm inputs / low max input levels on most network analyzers complicate matters, very few pieces on audio gear will be happy with those conditions.
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The Anritsu network analyser I have has 1M inputs and +20dBm input levels. With a 1:10 or 1:100 probe the input range can be extended.
tggzzz:
--- Quote from: uktony on June 12, 2017, 04:30:39 pm ---
--- Quote from: ruairi on June 12, 2017, 04:00:43 pm ---Tony,
Audio guy here, what do you need to test above 100k? Or rather why?
Cheers,
Ruairi
--- End quote ---
I have been experimenting with wideband preamps, along with HF distortion caused by bandwidth limiting.
And no, I can't hear any difference before anybody asks!!
This is purely experimentation.
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If your budget is limited, why not try some preliminary experiments with any old analogue scope? If nothing else, that will enable you to determine exactly what specifications you require for your tests.
If you are patient, you can find working 10MHz scopes on fleabay or gumtree for £10 - but make sure it is working! Or visit a local hackspace; my local one has so many of the damn things we are hoping members will take some before we tip them!
nctnico:
@tggzzz: great, now tell him how to read data from an analog scope into a computer! :palm:
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