Abstract
In this paper, multiple manganese-copper resistance wires are connected in parallel as the basic structure of the sampling resistor. The stability of the resistance wire is analysed when the conductor is connected in parallel and twisted, and the resistance wire of the sampling resistor is determined to be connected in a twisted manner to reduce the influence of interference on the measurement. Sampling resistance is annealed in a thermostat to release the internal stress of the stranded wire. Experiments show that the resistance has a stability of 7 ppm for 8 hours. The resistance is connected to a high stability constant current source for testing. The short-term stability of the constant current source is better than 10 ppm, which meets the design requirements.
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