[volt-nuts] Fluke 335A

[gbusg]

Hi Warren,

Here's some data at 15 minute increments.

Notes:
1. Far right column delta calculations are *relative* to the reading at 240 minutes (Reference). 
2. The first delta is at 15 minutes from 3458A cold start, thus hints at the 3458A warm-up characteristics.
3. The last reading was taken at 1440 minutes (therefore at a much greater interval than 15 minutes from previous reading).
4. The 10Vdc source is a Fluke 732A. The meter is a HP 3458A.

Also note: I'm sending this message as *Rich Text*, hoping the table survives the group's email process.

If it doesn't survive intact, I'll have to convert the table to jpg or something and re-send as an attachment. (Anyone here have a easy way to convert selected portions of xls files to jpg?)

      Proto #1                 
      Readings  Readings      
      Time  Before ACAL DC  After ACAL DC  Delta From Final 240 minute Reading for "Readings After ACAL DC" 
      0 min 10.0001136 V         
      15 min 10.0000269 V 10.0000183 V -1.6E-06 V -0.16 ppm 
      30 min 10.0000180 V 10.0000206 V 7E-07 V 0.07 ppm 
      45 min 10.0000202 V 10.0000211 V 1.2E-06 V 0.12 ppm 
      60 min 10.0000204 V 10.0000210 V 1.1E-06 V 0.11 ppm 
      75 min 10.0000201 V 10.0000209 V 1E-06 V 0.10 ppm 
      90 min 10.0000199 V 10.0000203 V 4E-07 V 0.04 ppm 
      105 min 10.0000203 V 10.0000204 V 5E-07 V 0.05 ppm 
      120 min 10.0000195 V 10.0000202 V 3E-07 V 0.03 ppm 
      135 min 10.0000196 V 10.0000203 V 4E-07 V 0.04 ppm 
      150 min 10.0000198 V 10.0000196 V -3E-07 V -0.03 ppm 
      165 min 10.0000204 V 10.0000207 V 8E-07 V 0.08 ppm 
      180 min 10.0000204 V 10.0000197 V -2E-07 V -0.02 ppm 
      195 min 10.0000196 V 10.0000198 V -1E-07 V -0.01 ppm 
      210 min 10.0000199 V 10.0000198 V -1E-07 V -0.01 ppm 
      225 min 10.0000199 V 10.0000198 V -1E-07 V -0.01 ppm 
      240 min 10.0000199 V 10.0000199 V Reference  Reference   
      1440 min 10.0000209 V 10.0000201 V 2E-07 V 0.02 ppm 



-Greg



----- Original Message ----- 
From: "ws at Yahoo" <warrensjmail-one at yahoo.com>
To: <volt-nuts at febo.com>
Sent: Monday, September 26, 2011 10:33 PM
Subject: Re: [volt-nuts] Fluke 335A


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 


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