[volt-nuts] Drifting 3458As

2017-11-29 Thread Randy Evans 
I have been testing two 3458As against a known good Fluke 732A. Each 3458A
was calibrated for DCV before the start of the measurements so they both
started at the same point.   I have been running a series of tests
consisting of measuring the Cal Constant as detailed in Service Note 18 for
each meter several times a day (to calculate the drift per the procedure in
SN 18).  I also measure the 732A voltage in each meter each time using NLPC
100 and NRDGS 100 and then recording the STDEV, MEAN, MAX, and MIN values.
What I have observed is that the Cal Constant is acceptably low but the
MEAN value per measurement  is drifting up in one meter and drifting down
in the other.   The unit drifting down has a new A3 board installed and the
unit drifting upward is an Agilent 3458A only a few years old so would not
be expected to have a drifting A3 board.  It was only calibrated 1 time per
the internal REV number, so would have likely been re-calibrated if the A3
board was replaced.


 My question is what is the likely cause of the drift in the MEAN voltage
reading if the Cal Constant value is relatively constant?  SN 18 says the
drift rate of the Cal Constant is an indication of drift in the A3 AD
board, but I believe it assumes the A9 voltage ref board has a constant
value over time.  If this is not true (e;g., the voltage ref is drifting),
I think this would explain the drift in the voltage reading even though the
Cal Constant is relatively constant.  Any opinions on this?


Thanks,


Randy Evans
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Re: [volt-nuts] Get 10K resistor calibrated in UK

2017-11-29 Thread Bill Gold 
Frans:

Mine which was built in 1979, and corrected for the 1990 change in the ohm,
and calibrated last in 2009 has drifted upwards by 1.61 ppm total.  So about
0.054 ppm/year.  I don't have any data from those 30 years so this is the
beginning and end points.  These all seem to have a spectacular performance
to say the least!

Regards
Bill

- Original Message - 
From: "Electronics and Books via volt-nuts" 
To: "Discussion of precise voltage measurement" 
Sent: Wednesday, November 29, 2017 6:25 AM
Subject: Re: [volt-nuts] Get 10K resistor calibrated in UK


> can anyone tell me howmuch a SR104 10k resistor drift
>
> Met vriendelijke groeten
> Regards
> Frans
>
> electronicsandbo...@yahoo.com
> http://ElectronicsAndBooks.com
> Netherlands
>
> Discere ne cesses
>
> 
> On Wed, 11/8/17, David C. Partridge  wrote:
>
>  Subject: Re: [volt-nuts] Get 10K resistor calibrated in UK
>  To: "'Discussion of precise voltage measurement'" 
>  Date: Wednesday, November 8, 2017, 4:08 PM
>
>  I guess that depends on your
>  definition of cheap :(
>
>  Dave
>
>  -Original Message-
>  From: volt-nuts [mailto:volt-nuts-boun...@febo.com]
>  On Behalf Of Alan Ambrose
>  Sent: 08 November
>  2017 14:31
>  To: volt-nuts@febo.com
>  Subject: Re: [volt-nuts] Get 10K resistor
>  calibrated in UK
>
>  NPL i.e.
>  the UK national lab, are also surprising flexible and cheap.
>  Looking at their schedule for '15/'16 (the one I
>  happen to have to hand) they had 10K ohm cal 30-Nov-15 to
>  11-Jan-16 @ £510. They also had voltage cal October and
>  March at ~£420.
>
>  A.
>  ___
>  volt-nuts mailing list -- volt-nuts@febo.com
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Re: [volt-nuts] Get 10K resistor calibrated in UK

2017-11-29 Thread John Devereux 

Mine seems to be within about 0.1ppm/year.


Electronics and Books via volt-nuts  writes:

> can anyone tell me howmuch a SR104 10k resistor drift
>
> Met vriendelijke groeten
> Regards
> Frans
>
> electronicsandbo...@yahoo.com
> http://ElectronicsAndBooks.com
> Netherlands
>
> Discere ne cesses
>
> 
> On Wed, 11/8/17, David C. Partridge  wrote:
>
>  Subject: Re: [volt-nuts] Get 10K resistor calibrated in UK
>  To: "'Discussion of precise voltage measurement'" 
>  Date: Wednesday, November 8, 2017, 4:08 PM
>  
>  I guess that depends on your
>  definition of cheap :(  
>  
>  Dave
>  
>  -Original Message-
>  From: volt-nuts [mailto:volt-nuts-boun...@febo.com]
>  On Behalf Of Alan Ambrose
>  Sent: 08 November
>  2017 14:31
>  To: volt-nuts@febo.com
>  Subject: Re: [volt-nuts] Get 10K resistor
>  calibrated in UK
>  
>  NPL i.e.
>  the UK national lab, are also surprising flexible and cheap.
>  Looking at their schedule for '15/'16 (the one I
>  happen to have to hand) they had 10K ohm cal 30-Nov-15 to
>  11-Jan-16 @ £510. They also had voltage cal October and
>  March at ~£420.
>  
>  A.
>  ___
>  volt-nuts mailing list -- volt-nuts@febo.com
>  To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
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>

-- 

John Devereux
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Re: [volt-nuts] Get 10K resistor calibrated in UK

2017-11-29 Thread John Devereux 
acb...@gmx.de writes:

> mine, since it was built in 1977, has drifted upwards by 1.6ppm.
> There is also a picture showing druft data of several SR104s on
> eevblog, but dont have the link handy.

I don't have link either but probably this copy here:






>
>
>
>
>> Gesendet: Mittwoch, 29. November 2017 um 15:25 Uhr
>> Von: "Electronics and Books via volt-nuts" 
>> An: "Discussion of precise voltage measurement" 
>> Betreff: Re: [volt-nuts] Get 10K resistor calibrated in UK
>>
>> can anyone tell me howmuch a SR104 10k resistor drift
>> 
>> Met vriendelijke groeten
>> Regards
>> Frans
>> 
>> electronicsandbo...@yahoo.com
>> http://ElectronicsAndBooks.com
>> Netherlands
>> 
>> Discere ne cesses
>> 
>> 
>> On Wed, 11/8/17, David C. Partridge  wrote:
>> 
>>  Subject: Re: [volt-nuts] Get 10K resistor calibrated in UK
>>  To: "'Discussion of precise voltage measurement'" 
>>  Date: Wednesday, November 8, 2017, 4:08 PM
>>  
>>  I guess that depends on your
>>  definition of cheap :(  
>>  
>>  Dave
>>  
>>  -Original Message-
>>  From: volt-nuts [mailto:volt-nuts-boun...@febo.com]
>>  On Behalf Of Alan Ambrose
>>  Sent: 08 November
>>  2017 14:31
>>  To: volt-nuts@febo.com
>>  Subject: Re: [volt-nuts] Get 10K resistor
>>  calibrated in UK
>>  
>>  NPL i.e.
>>  the UK national lab, are also surprising flexible and cheap.
>>  Looking at their schedule for '15/'16 (the one I
>>  happen to have to hand) they had 10K ohm cal 30-Nov-15 to
>>  11-Jan-16 @ £510. They also had voltage cal October and
>>  March at ~£420.
>>
> ___
> volt-nuts mailing list -- volt-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
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>

-- 

John Devereux
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Re: [volt-nuts] Get 10K resistor calibrated in UK

2017-11-29 Thread acbern 
mine, since it was built in 1977, has drifted upwards by 1.6ppm.
There is also a picture showing druft data of several SR104s on eevblog, but 
dont have the link handy.




> Gesendet: Mittwoch, 29. November 2017 um 15:25 Uhr
> Von: "Electronics and Books via volt-nuts" 
> An: "Discussion of precise voltage measurement" 
> Betreff: Re: [volt-nuts] Get 10K resistor calibrated in UK
>
> can anyone tell me howmuch a SR104 10k resistor drift
> 
> Met vriendelijke groeten
> Regards
> Frans
> 
> electronicsandbo...@yahoo.com
> http://ElectronicsAndBooks.com
> Netherlands
> 
> Discere ne cesses
> 
> 
> On Wed, 11/8/17, David C. Partridge  wrote:
> 
>  Subject: Re: [volt-nuts] Get 10K resistor calibrated in UK
>  To: "'Discussion of precise voltage measurement'" 
>  Date: Wednesday, November 8, 2017, 4:08 PM
>  
>  I guess that depends on your
>  definition of cheap :(  
>  
>  Dave
>  
>  -Original Message-
>  From: volt-nuts [mailto:volt-nuts-boun...@febo.com]
>  On Behalf Of Alan Ambrose
>  Sent: 08 November
>  2017 14:31
>  To: volt-nuts@febo.com
>  Subject: Re: [volt-nuts] Get 10K resistor
>  calibrated in UK
>  
>  NPL i.e.
>  the UK national lab, are also surprising flexible and cheap.
>  Looking at their schedule for '15/'16 (the one I
>  happen to have to hand) they had 10K ohm cal 30-Nov-15 to
>  11-Jan-16 @ £510. They also had voltage cal October and
>  March at ~£420.
>
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Re: [volt-nuts] Get 10K resistor calibrated in UK

2017-11-29 Thread Electronics and Books via volt-nuts 
can anyone tell me howmuch a SR104 10k resistor drift

Met vriendelijke groeten
Regards
Frans

electronicsandbo...@yahoo.com
http://ElectronicsAndBooks.com
Netherlands

Discere ne cesses


On Wed, 11/8/17, David C. Partridge  wrote:

 Subject: Re: [volt-nuts] Get 10K resistor calibrated in UK
 To: "'Discussion of precise voltage measurement'" 
 Date: Wednesday, November 8, 2017, 4:08 PM
 
 I guess that depends on your
 definition of cheap :(  
 
 Dave
 
 -Original Message-
 From: volt-nuts [mailto:volt-nuts-boun...@febo.com]
 On Behalf Of Alan Ambrose
 Sent: 08 November
 2017 14:31
 To: volt-nuts@febo.com
 Subject: Re: [volt-nuts] Get 10K resistor
 calibrated in UK
 
 NPL i.e.
 the UK national lab, are also surprising flexible and cheap.
 Looking at their schedule for '15/'16 (the one I
 happen to have to hand) they had 10K ohm cal 30-Nov-15 to
 11-Jan-16 @ £510. They also had voltage cal October and
 March at ~£420.
 
 A.
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 ___
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