[volt-nuts] 732A drift

[Bill Gold]

Alan:

    The basic answer is NO.  But a more expensive answer is to send the 732A
into FLUKE (or somewhere else that has a JJA) at regular intervals (i.e. 3
months) until you get a good idea of this unit's drift rate.  This is why
these units tend to multiply in your collection until you have at least 4 so
that you can inter-compare the differences between all 4, doing a chart and
then you can pretty well estimate the drift of each unit.

See pages 34 - 36 in the FLUKE publication "Calibration Philosophy in
Practice 1st ed" at this URL

http://www.ko4bb.com/getsimple/index.php?id=download&file=06_Misc_Test_Equipment/2_Various_Projects_and_Info/Calibration_Philosophy_In_Practice_1st_ed_FLUKE.pdf

Another publication is NBS Technical Note #430 at this URL

http://www.ko4bb.com/getsimple/index.php?id=download&file=02_GPS_Timing/Time_Nuts_Papers/Standard_Cells_NBS_Monograph_84.pdf

While written for standard cells they apply just as well for solid state
voltage references like the 732A/B.

Also is a FLUKE Application Note "Fractional PPM traceablilty using your
FLUKE 734A/732B" at this URL

http://us.flukecal.com/literature/articles-and-education/electrical-calibration/application-notes/fractional-ppm-traceabili

And "Maintaining 10 VDC at 0.3 PPM or Better in Your Laboratory" at this URL

http://us.flukecal.com/literature/articles-and-education/electrical-calibration/papers-articles/maintaining-10-vdc-03-ppm-o

    I have used this method on my 732As for years and can estimate overall
drift of each one.  I have 5 732As in the control chart.  Of course
periodically one needs to be sent into FLUKE for certification as to it's
exact NIST voltage.  While there is a lot of information in all of these
publications, I mainly depend upon the "Fluke Philosophy pp 34-36" methods.
While this may not satisfy the "purests", it works well for the hobbiest and
Voltnut.

    Have fun,

Bill

----- Original Message ----- 
From: "Alan Ambrose" <alan.ambrose at anagram.net>
To: <volt-nuts at febo.com>
Sent: Wednesday, August 30, 2017 9:33 AM
Subject: [volt-nuts] 732A drift


> >>> My 732A<x-apple-data-detectors://28> e.g. has a drift of only about
0.2ppm pa over a couple of year
>
> Hope you don't mind me jumping on this thread and asking a basic question:
is there any kind of procedure for the 'enthusiast' (say with single
3458A/single 732 and not say 4x732) to measure the drift of a particular
732.
>
> Alan
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