[volt-nuts] Fluke 335A

[gbusg]

Hi Joe,

The Fluke 732A (at 10Vdc) is by far the most "quiet" source I have here. 
With HP 3458A integration time set for 100 Power Line Cycles, (and for the 
combination of [Noise Produced by 732A]+[Noise Induced by 3458A]), I'm 
observing +/- 0.03ppm short-term noise (racking-around of the 3458A from 
reading to reading) at 10Vdc.

Regarding short-term noise of other possible DCV sources and combinations 
(including your D cell battery suggestion, homebrew zener references, etc.), 
I defer to the expertise and experience of the other fellows in the group, 
for their comments. (Fellows, what say regarding Joe's question?)

Best,
Greg


----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
Sent: Monday, September 26, 2011 9:14 PM
Subject: Re: [volt-nuts] Fluke 335A


Greg,

Are there sources 'known to be quite'?  Any way to make them quite?

How about a standard D cell battery?  With a filter capacitor?  I suspect it
will have a slow downward trend but how about ripple and noise?

Do any of the 'volt-nuts' have a favorite source to measure when looking to
see how 'stable' their DMM is?

I'll have to go back and look at the manual for the 335A about the Ripple
and Noise spec.

Thanks,

Joe