The system consists of cryogenic vessel, mechanical pump, hot water tank, channel flow resistance bridge, vacuum pressure sensor, and metal tube.
Experimental contents
☆To grasp resistance measuring method by Wheatstone bridge.
Configuration and technical parameters
☆Acquisition of low temperature;77K~60K(-196℃-213℃)
☆QJ23 Wheatstone bridge:1Ω-9999000Ω, precision: 0.2 class
☆Heater: 300W 220V; pumping speed of vacuum pump: final vacuum≤5x10^-3.