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Marlin - what type of termistor

Posted by Arnold 
Marlin - what type of termistor
August 23, 2017 04:01PM
Hi all, my silicon heatbed has termistor of these parameters: B25/50=3950K R25℃=100KΩ what kind of termistor should I set in latest Marlin ? There are many of similar parameters.
Re: Marlin - what type of termistor
August 23, 2017 05:26PM
100K ohm 3950 1% NTC Thermistor

This means it is a Negative Temperature Coefficient thermistor with a Beta value of 3950.
Have been using this thermister for a year and select ('1') for my thermister in Marlin, Verified with a DVM temperature probe and the readings are so close, I would except either as true.

100K ohm 3950 1% NTC Thermistor
Re: Marlin - what type of termistor
August 24, 2017 03:56PM
thanks Ill try it.
Re: Marlin - what type of termistor
August 26, 2017 03:32AM
I've generally found the generic white wired eBay /aliexpress ones to work best with thermistor type 11.
Re: Marlin - what type of termistor
August 26, 2017 07:56AM
Quote
slippyr4
I've generally found the generic white wired eBay /aliexpress ones to work best with thermistor type 11.

I seem to get good reading with type 1, now that you got my interest do you have and facts that you would like to share.
Can you explain the Difference and why you choose to use type 11 for your selection with the same 100k thermister
Re: Marlin - what type of termistor
August 26, 2017 04:41PM
Quote
Clif
I seem to get good reading with type 1, now that you got my interest do you have and facts that you would like to share.
Can you explain the Difference and why you choose to use type 11 for your selection with the same 100k thermister
first fact would be marlin calls for either 11 or 13 for the therm you described.

Re: Marlin - what type of termistor
April 25, 2018 03:39PM
I have the cheap 100K 3950 Beta thermister as well:

[www.amazon.com]

Haven't been able to find a data sheet.

If the original thermistor was 10 K with a 4.7 K pull-up, then shouldn't the 100K therm pull-up be something like 100K ?

I'd like to compare with Heart-Steinheart calc instead. Where can I find the A-B-C coefficients for this calculation? I need a bed heat control to add to an M3D printer I just acquired. I have an Arduino program to take readings, but I can't prove the coefficients are correct. Seems to work... I'd like to try the table out of Marlin, but that's not working yet.

I did find a calculator, I might try taking my own measurements.

Thanks,
Al
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