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Please recommend a scope (or other device) purely for audio testing.
uktony:
Thanks for all the replies and just to add a few points:
* I already have a 30MHz Owon 'scope
* I also have a Velleman PCSU200 'scope + waveform generator (lousy software)
* I am building preamps *not* power amps
* I have a FocusRite Scarlett 2i2 (V2) USB interface (192kHz)
I realise that the Tsunami device has it's limitations, however as a basic measuring tool I reckon it'll suit my purpose in this instance.
I was looking for further insight into my measurements, as I've been finding that some of my designs show a rising response just at the top end of my sound card measurement ability ~85kHz which I though was odd (it's not the sound card or the measuring software).
Finally - my Owon 'scope has an FFT function which isn't bad, however apart from basic screen grabs, accessing the data from a PC results in a .bin file which only the Owon software can read.
tggzzz:
--- Quote from: nctnico on June 13, 2017, 07:04:48 am ---@tggzzz: great, now tell him how to read data from an analog scope into a computer! :palm:
--- End quote ---
You appear to have missed the word "preliminary". That may, or may not, be sufficient for his purposes.
Personally I would think that if he is interested in audio signals, then looking at MHz signals is only beneficial as a sanity check to verify there's nothing stupid happening. An analogue scope might be sufficient for that.
If not, then the Digilent Analog Discovery is probably a reasonable choice, but that is 10* more expensive and the OP has limited finances. I have no idea whether the AD would be sufficient for audiophile level testing.
Fungus:
--- Quote from: tggzzz on June 13, 2017, 10:04:37 am ---Personally I would think that if he is interested in audio signals, then looking at MHz signals is only beneficial as a sanity check to verify there's nothing stupid happening. An analogue scope might be sufficient for that.
--- End quote ---
If you live in a place where they're easy to find for $25.
--- Quote from: tggzzz on June 13, 2017, 10:04:37 am ---If not, then the Digilent Analog Discovery is probably a reasonable choice, but that is 10* more expensive and the OP has limited finances. I have no idea whether the AD would be sufficient for audiophile level testing.
--- End quote ---
Will your analog 'scope do frequency sweeps and bode plots? That's what audio work needs and the AD will do that nicely (much better than any 8-bit DSO).
uktony:
This is a screenshot of a 5Hz to 1MHz on my Owon 'scope.
I enabled persistence to get a solid image.
Unfortunately there's no logarithmic option that I can find.
This sweep was generated by an AD9850 DDS generator that I control with an Arduino. I wrote a Windows program in vb.net to control it.
tggzzz:
--- Quote from: Fungus on June 13, 2017, 10:45:51 am ---
--- Quote from: tggzzz on June 13, 2017, 10:04:37 am ---Personally I would think that if he is interested in audio signals, then looking at MHz signals is only beneficial as a sanity check to verify there's nothing stupid happening. An analogue scope might be sufficient for that.
--- End quote ---
If you live in a place where they're easy to find for $25.
--- End quote ---
I know West Yorkshire is "oop t'north", but it isn't that remote :) There are several available on gumtree and fleabay!
--- Quote ---
--- Quote from: tggzzz on June 13, 2017, 10:04:37 am ---If not, then the Digilent Analog Discovery is probably a reasonable choice, but that is 10* more expensive and the OP has limited finances. I have no idea whether the AD would be sufficient for audiophile level testing.
--- End quote ---
Will your analog 'scope do frequency sweeps and bode plots? That's what audio work needs and the AD will do that nicely (much better than any 8-bit DSO).
--- End quote ---
While desirable, they might not be necessary. Given the OP can sweep a AD9850, he could generate a log frequency plot. Log amplitude would require a log amplifier.
Is 14-bit sufficient for the OP's puposes? Audiophiles might think not.
It is up to the OP to determine what else he could do with any money saved (oops: not spent).
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