[volt-nuts] Fluke 731B

[Stan Katz]

I use my 731B for both 10v standard, and to dial in microvolts. Since I'm
always switching the unit, does anyone know if it would be a good idea to
treat the contacts with Deoxit Gold?

On Sat, Mar 21, 2015 at 7:54 PM, Bill Gold <wpgold3637 at att.net> wrote:

> Richard:
>
>     I have one 731B that I have had for 15 or more years.  I have only been
> plotting drift for the last 10 years.  This was done against a bank of four
> 732A references.  The maximum drift that I have observed is about -1.5 ppm
> over that 10 year period.  This is as best as I can determine without
> having
> a Josephson Junction Array.  During the first 5 years of that period it
> seemed to drift around +0.4 ppm total, but then in December 2010 I moved to
> a new home and at that time it seems to have a -1.5ppm total drift over the
> next 5 years.  Not too sure why.  So as far as yearly drift I guess you
> could say that it averages around -0.15 ppm per year over that 10 year
> period.  As far as temperature dependence, all of this is over a range of
> 20C to 24C depending upon the temperature of the room.  I cannot separate
> the temp variations from the DC noise but just a casual look at the chart
> for the past 6 years it seems to indicate that this 731B output goes down
> with a higher room temp and vice versa but less than 0.4 ppm total over
> that
> range of temps.
>
>     Does this one beat specs, you bet!  Others may not be this good
> however.
>
> Bill
>
> ----- Original Message -----
> From: "Richard Moore" <richiem5683 at gmail.com>
> To: <volt-nuts at febo.com>
> Sent: Saturday, March 21, 2015 1:02 PM
> Subject: [volt-nuts] Fluke 731B
>
>
> > Hi all — realisitcally, what sort of stability can be expected from a
> fully functional 731B regarding variation in ambient temp a few degrees C
> around 23, and for long-term drift?
> >
> > Fluke’s specs are very conservative, and I think the 731 is far better
> than the specs would lead you to believe, but I have no practical
> experience
> with these units.
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