# Is this indeed a 10k thermistor?

Hey everyone once and a while I have come across one of these tearing down UPS systems and other power supplies.

I was wondering, is this indeed a 10k thermistor? At room temp it measured 80 oms, a bit warmer on my skin and it dropped to 78.9 ohms, I put it in a freezer for a short time and it went up to almost 90 ohms.

It would be fantastic if this was a regular old 10k thermistor because I lost my zip lock baggie of them and will have to wait at least three weeks for some off ebay, but also because the plate with a screw hole which is exactly what I need. I was really hoping someone knows exactly which one this is and link to a datasheet, because I'd love to order some of these too for when I need the temperature of a heatsink or other metal surface, screwing it on would be way better than just pressing the usual style against the heatsink.

A 10K thermistor has a resistance of about 10,000 ohms at room temperature.

A multimeter and warming it with your fingers would be able to show
if it is...

how to power 10k thermistor for preventing self heating?
if powering thermistor with arduino 5v all day , its geting warm.
is it possible to power thermistor only at measuring time? digital write?

You may use a heat sink tied to the top hole of the thermistor or you can use a resistor "in series" for limiting the current passing through the thermistor. You have to read the datasheet first to know the ratings & specifications of the thermistor.

As you said, the thermistor is self heating.... the probable reason may be that the thermistor is handling more power than it is supposed to handle. Suppose it is a 1/4 watt device but it is forced to handle more than that. in this case the thermistor can overheat or may burnt out as well. it is safe to use another resistor in SERIES to limit the current

In a simple way...
Volt X Current = Power
more volt X more current = more power
more power = more heat generated
so, if you decrease the current or voltage, you can reduce the heat.
I hope it will be helpful to you.

but what is the simple way to give power to thermistor only that time when measuring ..?

I/o pin for 5v----------------- resistor ------ Thermistor-------------GND
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| Acts as a voltage divider
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