[time-nuts] Low noise power supplies?

[gcarlistaa at garychatters.com]

On 31.01.2013 09:05, Adrian wrote:
> Rick,
>
> the E3610A is really clean.
>

The discussion is interesting, but the original question did ask about 
off the shelf so I have been watching for any mention of HP/Agilent 
precision power supplies.  The E3610A specification says 200 uVrms, 2mv 
pp ripple and noise over the range 20Hz to 20 MHz.  The now obsolete 
HP6114A spec is much better at 40uVrms, 100uV pp up to 20MHz.  The 6114A 
is no longer available (except on eBay), but there should be something 
equivalent or better.

I discovered the 6114A one day when I needed a nice stable voltage 
source to check some data acquisition equipment.  My first pick was a 
gel-cel,  but with a 34401 DMM you can watch those self-discharge.  A 
regular bench supply kind of wanders around.  But after a few minute 
warm-up the 6114A that I found sitting on a storage shelf was nice and 
stable.  I mentioned the specification for noise because I have observed 
its stability, but have not made any measurements on its noise.


Gary