Its certainly a good way to quickly check if anythings drastically wrong and
one could even compare them with a known source such as an LM317 based
regulator with no ADJ pin bypass. If one can hear the noise then its possible
that a sound card could make some meaningful measurements of the
In message <5776e31d.7090...@pacific.net>, Brooke Clarke writes:
>Instead of headphones something like the HP 4395A [...]
Well, there is a slight difference in price there, isn't there ? :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP
In message <2656f010-8e12-4bad-b9ae-713cefee1...@febo.com>, John Ackermann N8UR
writes:
>I have several supposedly low noise bench power supplies that I want to check
>out. They seem to work well but are quite old, so of course one wonders about
>the caps, etc.
>
>Can someone suggest
In the past when I did this, I used a high resolution digital
voltmeter like a Fluke 8505A in sample mode with a simple 10 Hz low
pass filter. I took samples for 10 seconds to get down to 0.1 Hz and
calculated the standard deviation to get RMS noise. I made a recent
post about this in connection
I've used a pair of minicircuits phase modulators, a low noise OXCO, and a
Timepod to do this.The phase modulators work best with about 9V input.The noise
of my E3610A's is clearly evident as is the noise of an LM317 based regulator
with unbypassed ADJ terminal.To achieve lower system noise a
I have several supposedly low noise bench power supplies that I want to check
out. They seem to work well but are quite old, so of course one wonders about
the caps, etc.
Can someone suggest a practical test regime to verify power supply DC noise
performance? Preferably one that doesn't
