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 pair of preamps
(one per phase modulator) is useful, however the noise need not exceptionally
low as cross correlation lowers the effective preamp noise.
Bruce
From: John Ackermann N8UR <[email protected]>
To: [email protected]
Sent: Saturday, 2 July 2016 12:47 AM
Subject: [volt-nuts] Practical power supply noise testing
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 require building up custom low noise
amps?
Thanks!
John
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