[time-nuts] What do people use for measuring temperature?

[Bill Notfaded]

>From I know from measuring voltage references getting linearity in those
kinds of temp ranges not only requires really good sensors but often it
needs to be thermally bonded to what's being measured and often with some
block of material that's makes swings in temperature much more subtle.
Even a breeze in the lab or changes in the AC or heat from area causes big
swings.  Everything needs to be contained.  Measuring temp that way when
doing sub ppm voltage measurements isn't trivial.

I'd be interested too if someone has built a better mouse trap for this?  I
keep my HP3458A right on top of my older 3456A.  The 3456A is still an
amazing piece of gear and GPIB is the way to go with it.  I bought a
Conductus LTC-21 temperature controller for doing temperature
tests... temperature resolution of the LTC-21 is 1 part in 51200.  I'm
planning on using PT1000 RTD with it.  It's one of those projects on the
shelf for now but I've been slowly collecting the special connectors for
the back if it although you can just stick some wire in there.

Bill


On Fri, Sep 25, 2020, 8:29 PM Bob Albert via time-nuts <
time-nuts at lists.febo.com> wrote:

>  It would appear that the HP 3456A in temperature mode would meet your
> needs.  The 5k thermistor is very cheap.  The temperature resolution is
> very small, as I recall perhaps 0.001 degree but not sure.  You can log
> manually or via GPIB.  Don't think its accuracy is anywhere near its
> resolution but it's great for relative readings.
> Bob
>     On Friday, September 25, 2020, 07:46:35 PM PDT, Hal Murray <
> hmurray at megapathdsl.net> wrote:
>
>
> I've got a collection of 1-wire gizmos and USB thumb drives.  They are
> great
> for many applications but I'm looking for something better/different.
>
> I'd like something that reads to 0.01 degree or 0.001 degree.  I don't
> need
> accuracy.  What I want is reasonable linearity so I can make pretty graphs.
>
> I'd like the actual probe to be small enough so I can poke it inside gear
> like
> a PC and attach it to a crystal.
>
> I'm looking for a USB or serial connection so I can log the data.
>
> Is there an obvious brand/whatever I should be looking at? thermistor?
> thermocouple?  ...
>
> I don't care about a display on the device.  I don't want a logger, they
> fill
> up.  I want to grab the data on the fly and do my own logging.  (But I'm
> happy
> to use a logger if it will do what I want.)
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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