[volt-nuts] Fluke 732A themistor reading

[Todd Micallef]

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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