[volt-nuts] Fluke 732A themistor reading

[Randy Evans]

I do have an ESI SR1 10Kohm standard, but I'm not sure its accurate
enough.......time to look around I suppose.

BTW, I understand that TV twin lead, the copper wire type, makes a good
test lead for the 3458 measurements.  It seems reasonable, although the
leakage resistance might be questionable.

Randy


On Sun, Aug 17, 2014 at 1:36 PM, Todd Micallef <tmicallef at gmail.com> wrote:

> Randy,
>
> Next thing you know, you will be looking at a 10K standard resistor to go
> with that 3458A and possible 732A.
>
> Todd
>
>
> On Sun, Aug 17, 2014 at 3:51 PM, Randy Evans <randyevans2688 at gmail.com>
> wrote:
>
> > Todd and Bill,
> >
> > Thanks for the input.  The 3.6 K thermistor reading seems viable and i
> will
> > pursue it further.
> >
> > I may have over committed myself to modifying the HP-419A, the Fluke
> 845A,
> > buying the 3458A and looking at buying a Fluke 732A.
> >
> > So much to do and so little time.
> >
> > Thanks again,
> >
> > Randy
> >
> >
> > On Sun, Aug 17, 2014 at 11:48 AM, Bill Gold <wpgold3637 at att.net> wrote:
> >
> > > Randy:
> > >
> > >     I have 6 ea Fluke 732A instruments.  The results of being an over
> the
> > > edge and deeply obsessed "Volt Nut", they just kept adding
> (reproducing?)
> > > over the years.  My readings for the themistors range from 3.407K OHMS
> to
> > > 4.514K OHMS and all work just fine.  3.6K OHMS would seem just fine to
> > me.
> > > It really depends upon the final inside temp of the oven assembly.  The
> > one
> > > with 3.407K OHMS measures around 47.5 degrees C while the others are
> > around
> > > 45 C.  It is the stability of this reading over time that is very
> > > important.
> > > Fluke says that it could change as much as 10 ohms per month but mine
> are
> > > rock solid for years and years.
> > >
> > > Bill
> > >
> > > ----- Original Message -----
> > > From: "Randy Evans" <randyevans2688 at gmail.com>
> > > To: <volt-nuts at febo.com>
> > > Sent: Sunday, August 17, 2014 11:08 AM
> > > Subject: [volt-nuts] Fluke 732A themistor reading
> > >
> > >
> > > > Can anyone tell me what value to expect for a Fluke 732A thermistor
> > > > reading?  I am looking to get a used 732A and one of the things I was
> > > told
> > > > to look for is to measure the thermistor reading after the unit has
> > > heated
> > > > up for at least an hour.  I saw in one of the posts that a "typical"
> > > > reading was 4950 ohms.  One vendor I asked said he measured about
> 3600
> > > ohms
> > > > after a two hour warmup. I was concerned that this is too low.  What
> do
> > > you
> > > > guys think?
> > > >
> > > > Thanks,
> > > >
> > > > Randy
> > > > _______________________________________________
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