The measurement hetsudo device null in the critical thermometry machine of the super-conductivity

摘要

PURPOSE:To decide the critical temp. of a superconducting material by two methods; resistance measurement and Meissner effect detection by connecting measuring lead wires from the outside to a Meissner effect detector by means of a printed wiring board, connector receptacles and connector pins. CONSTITUTION:A measuring stage 2 and the collar-shaped printed wiring board 3 are attachably and detachably fixed by means of screws 4 onto a cold head 1. The connector receptacles 5 and connector pins 6 for connection of the meas uring lead wires are attached to the printed wiring board 3. A recess 8 is pro vided atop the measuring stage 2 to fix the Meissner effect detector unremovably. The measuring lead wires 7 are connected from the outside to the Meissner effect detector 9 by means of the printed wiring board the connec tor receptacles 5 and the connector pins 6.