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 <[email protected]> wrote: From: Ralph Devoe <[email protected]> Subject: [time-nuts] HP 105B power supply noise To: [email protected] 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
