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Identify thermistor by resistance

Posted by kr15_uk 
Identify thermistor by resistance
August 10, 2018 11:17AM
Ladies and gents,

I need little help here please.

I'm converting 2x Tiertime UP! machines (UP! Mini and UP! Plus) to Marlin board etc and have little issue with identifying their used thermistors.
(UP! Plus uses them on hotted and bed, Mini - hotted only)

I've done 3x measurements which are the following:
21c 111kOhm
160c 171kOhm
220c 198kOhm

I don't have massive experience with thermistors but shouldn't good old (NTC 100k like) thermistor drop resistance while temp is rising?! Due to the rise it looks more like PT100/1000 but resistance numbers doesn't match.

// I know I could simply replace them with some generic ones but - 1. on UP! Mini it's thermal cemented in 2. It's already there, kinda wasteful 3. I'm planning to stick on Github all my conversion plans etc so anyone can do that with this "closed source" machine and don't want to scare some "greener" audience.

Thanks in advance.

Kris M
Re: Identify thermistor by resistance
August 10, 2018 11:52AM
yes a NTC thermistor decreases Resistance with increasing Temperature
Re: Identify thermistor by resistance
August 11, 2018 11:50AM
Funny, indeed that they use a PTC. Note PTC exhibit a better T° R curve, provided one stay in the P region.


Edited 1 time(s). Last edit at 08/11/2018 11:52AM by MKSA.

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