Products > Test Equipment

Audio Analyzers (but not a toy)

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2N3055:

--- Quote from: mawyatt on June 28, 2023, 02:47:52 pm ---We second the PicoScope 4262, although don't use as much as we should since it requires a laptop, and we much prefer a dedicated standalone DSO. Also does quite a respectable job as a low frequency FFT analyzer, or FRA.

Best,

--- End quote ---

1+ for Pico 4262

danils:
In my view it's unclear if the OP is looking for a spectrum analyser working in the audio band or a so called "audio analyser" with all the audio related measurement function.

If the request is about the second, there are some 90s R&S UPA-UPL-UPV etc. all-in-one boxes on the bay site at interesting price. As usual there are limits like FFT resolution, no more support etc. some are MS-DOS based machines.

With about 2000 USD you get a UPA that is still a good machine for not-so-demanding measures.

I personally own a AP SYS-2300, still impressive but still pricey

KungFuJosh:

--- Quote from: danils on June 28, 2023, 04:13:53 pm ---In my view it's unclear if the OP is looking for a spectrum analyser working in the audio band or a so called "audio analyser" with all the audio related measurement function.

--- End quote ---

What I really wanted was instant gratification bode plots (for things like guitar pickups, and speakers), but I'll stick with my scope for now, and eventually try out the software based stuff.

nenea dani:
Focusrite 4i4 has only one linear source and about 5 in switching mode, so the sinusoidal signal is not extremely clean in generator mode. I am attaching a photo for compliance, although one of the sources is masked by cables. With REW I noticed that after 25kHz the signal drops and above 30kHz it starts to have phase noise. In loop mode, the oscilloscope seems to provide a synthetic signal because everything seems perfect. I tested with the Fluke196C, which I trust.
I also asked on this forum why most SAs start with 9Khz or a few with 5Khz. One of the answers was that there is a problem with the input capacitor. For the analog situation when the audio signal is mixed with another one, I found out that in the first Hz's nothing conclusive can be measured because the phase noise from the local oscillator extends too much. They are just findings in amateur conditions.

trobbins:

--- Quote from: KungFuJosh on June 28, 2023, 04:57:28 pm ---What I really wanted was instant gratification bode plots (for things like guitar pickups, and speakers), but I'll stick with my scope for now, and eventually try out the software based stuff.
--- End quote ---
Soundcard and REW provides frequency response of amplitude and phase, from 2Hz to 96kHz.  Compensation is automated for 2Hz to circa 10-20Hz, and from circa 40k to 96kHz where the soundcard and probes and test rig may have a non-flat response.  That is, as I understand it, your instant 'Bode' plot.  For some esoteric audio applications where feedback related stability is a concern, the 96kHz upper limit can be too low, as measurement of gain and phase margins require a wider bandwidth (and hence a need to go to something like a Picoscope 2206B with FRA software to extend Bode plot bandwidth to 1MHz).


--- Quote from: nenea dani on June 28, 2023, 10:37:33 pm ---  Focusrite 4i4 has only one linear source and about 5 in switching mode, so the sinusoidal signal is not extremely clean in generator mode. I am attaching a photo for compliance, although one of the sources is masked by cables. With REW I noticed that after 25kHz the signal drops and above 30kHz it starts to have phase noise. In loop mode, the oscilloscope seems to provide a synthetic signal because everything seems perfect.
--- End quote ---
I'm unsure what you are describing.  You seem to infer that internal circuitry of the 4i4 is adding spurious signals to a generated sinewave, but only show a photo rather than a loopback response (!?)  Your test setup may need some refinement, although it would be expected that a raw loopback would show the effects of high frequency roll-off from either the DAC side, or the ADC side, or your interconnection, which is why REW allows you to calibrate out such droop.

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