[volt-nuts] Practical power supply noise testing

Mitch Van Ochten Mitch at vincentelectronics.com
Sat Jul 2 17:17:47 EDT 2016

Hi John,

A simple check is to measure the output with an HP 3400A or HP3400B.  These are true RMS meters (AC coupled) with 10 Hz to 10 MHz BW and capability to handle VERY high crest factors and still give an accurate readings.  They go down to 1 mV FULL-SCALE which should be sensitive enough for checking bench supplies.

Best regards,


-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of John Ackermann N8UR
Sent: Friday, July 01, 2016 8:47 AM
To: volt-nuts at febo.com
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?


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