[volt-nuts] Practical power supply noise testing

[John Ackermann N8UR]

Hi Bruce -- that's a really neat idea, particularly since the supplies I 
want to test are used for phase test measurements!

I'm curious though about a pair of modulators.  I'd think that you would 
split the reference output, insert the modulator into one side of the 
line, and then measure the noise increase when putting power on the 
modulator input.  Not sure where the second modulator would be used.

Thanks,
John

On 07/01/2016 09:14 AM, Bruce Griffiths wrote:
> 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 <jra at febo.com>
>   To: volt-nuts at febo.com
>   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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