RE: Blog #2: Characterising Thermistors - What's In The Box?

DAB — Tue, 02 Aug 2022 19:21:34 GMT

I like the crimp connector way to mount the thermistors.

In the old days, we had a lot of difficulty getting them to stay at the right place where we needed the measurements.

RE: Blog #2: Characterising Thermistors - What's In The Box?

misaz — Tue, 02 Aug 2022 10:33:37 GMT

Nice overview of the kit. I have two notes:

Beta value of non-ring terminal thermistor is 3892 and not a 3982 (swapped 8 and 9). Molex mention wrong value on website while Drawing PDF document contains correct value. [mention:0d133614bf01463a9e17ef49e25b2c0b:e9ed411860ed4f2ba0265705b8793d05] noticed this first time and Molex Support confirmed me that 3892 from Drawing is correct.

In fact 8 of 10 thermistors can be identified without need to measure them.

In case of RING thermistor you can use lasered labels. They are hard to see in my case but I found them. First line is identification, second line is date code. Thermistors with beta value 3500 have 10MA label (10 means 10k at 25°C and MA mean 3500 beta value) and thermistor with beta value 3800 has 10MB label. Difference between two thermistors with 3500 beta value is accuracy (1% and 2%), othervise their characteristics are the same, so they can be mostly freely exchanged.

Thermistors without ring terminal can be indetified using wire and epoxy color which can be found in drawing of all thermistors. I summarized thermistors from our kit in following table. Only one collision is here. The only way to distinguish 215272-3307 and 215272-3607 is by measurement because both have black wire and black epoxy. Otherwise thermistors from the kit are uniquely colored.