Build a Clone of the Tek P6602 Temperature Probe

[med6753]

One of the features of the Tek 2465 DMS with the DMM option is the ability to measure temperature using the Tek P6602 Temperature probe. The probe utilizes a thermistor as it's measuring device. A quick search of the web for either the probe itself or a manual has resulted in what I think are ridiculously high prices for either the manual starting at $20 or the probe itself starting at $50. If it's just a thermistor why not build a clone? But the only info I can find on the thermistor is that it should be 100 ohms at 0 degrees C. And it doesn't specify if it's NTC or PTC. But thermistors are sold specifying their resistance at 25 degrees C. So....does someone have a manual or the probe and can tell me the thermistor value at 25 degrees C? That would also tell me if it's NTC or PTC. That would give a starting point to experiment.

Thanks.

[Vgkid]

100 ohms at 0.0c is a pt100 rtd.

[med6753]

100 ohms at 0.0c is a pt100 rtd.

Is this what you are referring too?

http://www.mouser.com/ds/2/619/M1020_HST-USA-270809.pdf

[PA0PBZ]

If you want to experiment why not hook up a 200 Ohm pot? Turn it so that the 2465 shows 25^oC and measure the value.

[med6753]

If you want to experiment why not hook up a 200 Ohm pot? Turn it so that the 2465 shows 25^oC and measure the value.

That's an excellent idea.  I'll give it a try.

[edavid]

100 ohms at 0.0c is a pt100 rtd.

Yes, that's what it is... *not* a thermistor.

BTW, good luck finding a mating Lemo connector for less than the cost of a complete probe.

[med6753]

100 ohms at 0.0c is a pt100 rtd.

Yes, that's what it is... *not* a thermistor.

BTW, good luck finding a mating Lemo connector for less than the cost of a complete probe.

Why would I need a Lemo connector? The probe plugs into the DMM input which are standard banana jacks. It does not plug into the powered probe jacks on the scope mainframe.

[edavid]

Why would I need a Lemo connector? The probe plugs into the DMM input which are standard banana jacks. It does not plug into the powered probe jacks on the scope mainframe.

Oops, it's the P6601 that has the Lemo.