[time-nuts] temperature sensor

Alexander Pummer alexpcs at ieee.org
Mon Jul 21 07:39:51 EDT 2014

NTC are not that very stable, they are amorphous material winch could 
recrystallize slowly and therefore change it's electrical behavior , 
PT100 style is more reliable since it is pure metal

On 7/21/2014 1:22 AM, Attila Kinali wrote:
> On Sun, 20 Jul 2014 23:18:38 -0700
> "Tom Van Baak" <tvb at LeapSecond.com> wrote:
>> To satisfy my curiosity and get actual data I'd like to place 6 or more
>> tiny analog high-resolution temperature sensors all around the OCXO of a
>> Trimble Thunderbolt. That's high-resolution both in temperature and in time.
>> In other words, no fake accuracy "averaging" allowed. The goal is to observe
>> thermal gradients in real-time and see how good, or how bad, the correlation
>> is among crystal temperature, case temperature, and DS1620 temperature
>> sensor (which is mounted a considerable distance from the OCXO). The same
>> technique, and maybe even the same conclusions, might apply to Rb.
> May i ask what speaks about using PT100/PT1000 or NTCs?
> NTCs are dirt cheap, but might need some calibration first, to
> get to time-nuts standards. But PT100 aren't that much more expensive
> either.
> eg:
> The NTCALUG03 by Vishay don't look too bad, or if you want PT100
> the M310 by Heraeus. The KN1510 by Heraeus look also nice, but are
> a tad bit more expensive (about 20USD/pcs)
> 			Attila Kinali

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