Hello, I ask someone who is well versed in electronic measurements. I would like to roughly measure the noise of a psu and was wondering what WIN software was adequate beyond a high def oscilloscope.
Among various searches I found this article where the author describes the measurement in question, but does not specify in detail. Anyone have any advice on performing like this?
I tried this Audio Tester V3.0 and it seems to me a good software.
I thought of interfacing it to a suitable external sound card and a simple DC blocking circuit for the purpose.
Among various searches I found this article where the author describes the measurement in question, but does not specify in detail. Anyone have any advice on performing like this?
I tried this Audio Tester V3.0 and it seems to me a good software.
I thought of interfacing it to a suitable external sound card and a simple DC blocking circuit for the purpose.
Opss, I forgot to mention it:
https://audioxpress.com/article/pra...udio-measurements-part-6-measurement-examples
https://audioxpress.com/article/pra...udio-measurements-part-6-measurement-examples
For PS noise measurements my go-to is a HP 3400A RMS voltmeter - good from under 1mV to 300V, 10Hz to 10MHz, RMS responding. Very accurate and easy to use.
Hal
Hal
It'll work for measuring simple power supplies, but good supply regulators should have noise well below a mV.
To measure those, your soundcard system will not have enough sensitivity.
You would need a low noise preamp; there are several designs floating around here at diyaudio.
Jan
To measure those, your soundcard system will not have enough sensitivity.
You would need a low noise preamp; there are several designs floating around here at diyaudio.
Jan
You could always get one of these boards for the preamp function. AD8429 has the lowest noise : https://www.aliexpress.us/item/3256...00030331354057!sea&curPageLogUid=jTSdiXRbt29W
Scott Wurcer's LNA is suited for measuring power supply noise even below 1uV. Cheap to build and robust.
https://www.diyaudio.com/community/...urement-amp-for-ikoflexer.175044/post-2326742
https://www.diyaudio.com/community/...urement-amp-for-ikoflexer.175044/post-2326742
Interesting, alternatively could I use one of the circuits (the one with the FET pair) posted here?
Design of ultra low noise amplifiers.pdf
Also, I wondered if it's safe in order to measure at tube plate voltage. Maybe preceeded by something like this;