Abstract
A simple noise thermometer, based on the measurement of the currents produced by the noise voltages over a 44 μω manganin resistor with a commercial SQUID, has been used for temperature measurements between 0.1 K and 0.4 K. Results at the superconductive transition points of AuIn 2, AuAl 2 and Ir (nominally at 208 mK, 162 mK and 100 mK), realized with a NIST SRM 768 device, are consistent with the assigned NIST temperature values within 0.15 percent. 3He melting pressures have been measured at these three points and at the minimum of the melting curve, ( p min=(2.9311 4±0.0002)MPa). Existing data for the melting curve are compared with results of thermodynamic calculations between 2 mK and 250 mK.
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