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
Hi Warren,
Here's some data at 15 minute increments.
Notes:
- Far right column delta calculations are relative to the reading at 240 minutes (Reference).
- The first delta is at 15 minutes from 3458A cold start, thus hints at the 3458A warm-up characteristics.
- The last reading was taken at 1440 minutes (therefore at a much greater interval than 15 minutes from previous reading).
- 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@yahoo.com
To: volt-nuts@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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and follow the instructions there.
Hi Warren,
Here's some data at 15 minute increments.
Notes:
- Far right column delta calculations are relative to the reading at 240
minutes (Reference). - The first delta is at 15 minutes from 3458A cold start, thus hints at the
3458A warm-up characteristics. - The last reading was taken at 1440 minutes (therefore at a much greater
interval than 15 minutes from previous reading). - 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?)
