Thermisters

Thermisters at CERN
Probes 1-9 inclusive, sent to CERN in 2005
Probes 20-39 inclusive, sent to CERN, Sep 2006

Thermisters on the Supercrystal interface plate
One per SC, Betatherm Thermister part number 100K3960DP
3.8mm long glass bead by 2.1mm diameter with 2.8cm leads
                                100.0Kohms at 25^oC
                                124.9Kohms at 20^oC
                                322.4Kohms at 0^oC
Follows Steinhart-Hart equation
1/T = a + b(lnR) + c(lnR)³ , T in ^oK
Beta constant, a material constant, in ^oK, of a Negative Temperature Coefficient (NTC)
thermister provides an indication of sensitivity to temperature, defined as
Beta = ( 1/(1/T₁-1/T₂) ) * ln(R₁/R₂)
Proposal for the calibration of the thermisters, P Flower 5.5.04 doc