Hi Poul
When testing VCOs any noise on the control voltage causes a frequency change in
the output which can be characterized.
The HP/Agilent 4352 VCO tester contains a programmable DC supply with
exceptionally low noise.
Instead of headphones something like the HP 4395A which has a spectrum analyzer mode with a true RBW of 1 Hz to allow
displaying root(Hz) noise levels (true I&Q detection rather than the old analog peak detection).
http://www.prc68.com/I/4395A.shtml <http://www.prc68.com/I/4395A.shtml>
AFAICR there were some HP app notes on measuring power supplies which may have
included noise.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
-------- Original Message --------
--------
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 a practical test regime to verify power supply
DC noise performance? Preferably one that doesn't require building
up custom low noise amps?
Listen to them ?
All the "hard" noise is in the audio-range, so a series capacitor
a low-noise amp and a pair of headphones...
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