1.引言低温超导现象在精密电计量方面的应用,在测量准确度方面有效地提高了现行室温下的测量技术。在超流氦槽中操作电阻器从温度均一这方面来说是很有利的,即使热传导受 Kapitza 热导的限制。电阻器在低温下操作可大大地减小热噪声。已经研制了使用超导连接的稳定电阻器。因而 1. INTRODUCTION The application of cryogenic superconductivity in precision electrical metering has effectively increased the current measurement technique at room temperature in terms of measurement accuracy. Operating a resistor in a superfluid helium tank is advantageous in terms of uniform temperature, even though thermal conduction is limited by the Kapitza thermal conductance. Resistors operating at low temperatures can greatly reduce thermal noise. Stable resistors using superconducting connections have been developed. thus