A refrigerated dewar has been used successfully with the Josephson array voltage calibration system. It has been used to reliquify helium with no degradation of the calibration system’s performance. The independence of the array voltage from temperature has been confirmed to three parts in 108 per degree kelvin over the range 1.6 K ≤ T ≤ 4.6 K. No significant change in the array operation on a quantized state near 1.018 V was detected when its surrounding bath was pumped superfluid or when it was cooled by helium vapor at 4.6 K.
|Journal||IEEE Transactions on Instrumentation and Measurement|
|State||Published - 1991|