Guru
Joined: 20/06/2011
Location: AustraliaPosts: 2979
| Posted: 03:04am 14 Aug 2020 |
Hi Paul,
I used filtered ice water from our fridge and ice dispenser... After about 15min neither sensor dropped below 0.5c
I actually did another test that I didn’t report, I used a can of freeze spray and they once again followed each other within 0.5 and 0.25C (dropping was a bit more inconsistent (no more than 1.5C but I put that down to me spraying one more than the other chip, it is hard to equally spray each DS18B20 even though I bound them together)...
At about -27.5C (a bit like a Polak summer??) I stopped and let them both recover and the spread between the known good Mouser and the suspect Jaycar chip was no more than 0.25 99% of the time with the odd one 0.5 difference between chips and quite often reading Exactly the same.
My conclusion is that the Jaycar chip IF it is a fake is an extremely good fake and is most definitely suitable to be used as a DS18B20.
Kind Regards,
Mick