[time-nuts] HP 105B power supply noise

[Robert Atkinson]

Hi Ralph,The 10811A/B manual (10811-90002) gives a circuit of a low noise power supply for test purposes. It's 723 with filtering on the reference (2k2 and 4u7). I'd suggest something similar. I've always liked the 723. As a bonus it's of the correct vintage and still current.
Robert G8RPI

--- On Thu, 25/2/10, Ralph Devoe <rgdevoe at gmail.com> wrote:

From: Ralph Devoe <rgdevoe at gmail.com>
Subject: [time-nuts] HP 105B power supply noise
To: time-nuts at febo.com
Date: Thursday, 25 February, 2010, 17:05

Speaking of low-noise regulators, I have an HP 105B standard that has
a burned up regulator board. The previous owner patched it up but it
still has about 50 mV of 60 Hz on the regulated 18.7 volt line. The 5
MHz output has a half a dozen 120 Hz noise sidebands when viewed on a
spectrum analyzer (an HP 3585a).

I'm trying to decide whether to repair the board or put in a modern
regulator. I'm assuming that I need better than 1 mV stability and
much less noise to get a clean signal. Any suggestions?

Ralph

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