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
73
Alex
On 7/21/2014 1:22 AM, Attila Kinali wrote:
On Sun, 20 Jul 2014 23:18:38 -0700
"Tom Van Baak" <t...@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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