Four-terminal resistor and method for measuring time constant of four-terminal resistor

Abstract

The invention provides a four-terminal resistor and a method for measuring the time constant of the four-terminal resistor, belonging to the field of resistance measurement standards. The four-terminal resistor adopts a coaxial bracing wire structure and comprises an outer shell (3), a resistance wire (7), a central rod (6), a shunt disc (5) and an afflux disc (4), wherein the resistance wire (7), the central rod (6), the shunt disc (5) and the afflux disc (4) are installed in the outer shell (3). According to the method, the resistance wire with a low resistivity is adopted to replace the resistance wire with a high resistivity in the four-terminal resistor to form a four-terminal resistor RC with the low resistivity; the four-terminal resistor RC with the low resistivity and a four-terminal mutual inductor M are mutually replaced to realize measurement to the inductance value L of the four-terminal resistor; and the capacitance value C of the four-terminal resistor is obtained through measuring the capacitance of the four-terminal resistor RC with the low resistivity in which a current loop is disconnected. According to the four-terminal resistor and the method, the traceability problem of angle difference measurement of the four-terminal resistor in the alternating-current electric quantity measurement process is solved.

Description

technical field [0001] The invention belongs to the field of resistance measurement standards, in particular to a four-terminal resistance and a method for measuring the time constant of the four-terminal resistance. Background technique [0002] When passing through alternating current, when the frequency is not very high, the equivalent circuit of the resistor can be expressed by a circuit with concentrated parameters, that is, the AC resistance can be equivalent to its DC resistance in series with a residual inductance and parallel with a distributed capacitance. The physical explanation is that when the AC current flows through the resistor, the AC voltage will produce a phase shift. The angle of this phase shift is the product of the angular frequency and the time constant. The higher the frequency, the larger the time constant, and the greater the phase shift. . From the time domain, if the alternating current is a pulse current, then the time constant is the time req...

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However, the uncertainty of this method correction will be very large

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