[volt-nuts] Fluke 335A

[ws at Yahoo]

Greg
What PP varations do you see over an hour or two?
ws
*************
Hi Joe,

Yes, that's correct.

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 10:12 PM
Subject: Re: [volt-nuts] Fluke 335A


Greg,

If my math is correct, then you see about +/- 0.3 uV at 10 V.  Correct?

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] 
On
Behalf Of gbusg
Sent: Monday, September 26, 2011 10:45 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 335A


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