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| 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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