I’m interested in measuring frequency response, distortion, etc of signals from dc to 100kHz or so with a spectrum analyzer, and digital oscilloscope, and wondering where to find upper and lower frequency limits of various USB audio interfaces. I’d like a little more range dynamic range than my current setup, which is a Syscomp circuit gear mini. It has a maximum of 60db range as a network analyzer, and is limited also in the noise floor for distortion tests.
Many of the sound card interfaces can do much better for s/n measurements, but are limited to about standard audio range of about 20-22khz for both tone generation and audio input. I’ve seen a few examples here where there are interfaces useful up to about 55khz such as here: https://daqarta.com/dw_gguu.htm
Looking for info on something like the creative x6 to see what upper and lower frequency ranges are, and whether there are other, better options out there for not much money.
Primarily I’m interested in looking at parasitic oscillations in amplifiers and quantifying distortion products/harmonics in lower frequency oscillators, looking at bode plots of filters, transducers, etc. some for audio, some for “science”. The new nano-VNA devices satisfy these needs from 100khz to the gigahertz range, but anything useful as a stand alone device better than the Syscomp circuit gear for the sub 100khz range is not really justifiable for hobby use.
I think I would be plenty happy with a device that is able to achieve between 90-100 db sinad though higher would be nicer), and usable frequency to 192khz, being able to calibrate the response in software, so perfectly flat probably not necessary.
Thanks in advance for any tips on what to look at!
Many of the sound card interfaces can do much better for s/n measurements, but are limited to about standard audio range of about 20-22khz for both tone generation and audio input. I’ve seen a few examples here where there are interfaces useful up to about 55khz such as here: https://daqarta.com/dw_gguu.htm
Looking for info on something like the creative x6 to see what upper and lower frequency ranges are, and whether there are other, better options out there for not much money.
Primarily I’m interested in looking at parasitic oscillations in amplifiers and quantifying distortion products/harmonics in lower frequency oscillators, looking at bode plots of filters, transducers, etc. some for audio, some for “science”. The new nano-VNA devices satisfy these needs from 100khz to the gigahertz range, but anything useful as a stand alone device better than the Syscomp circuit gear for the sub 100khz range is not really justifiable for hobby use.
I think I would be plenty happy with a device that is able to achieve between 90-100 db sinad though higher would be nicer), and usable frequency to 192khz, being able to calibrate the response in software, so perfectly flat probably not necessary.
Thanks in advance for any tips on what to look at!