Voltage measuring instrument

Abstract

A voltage measurement instrument is prepared as forming the first stepping disc by one measurement disc and two auxiliary discs, forming the second stepping disc by measurement disc with 9x9 omega ring resistance net and two 1omega resistance as well as auxiliary disc with 10x0.5 omega resistances, forming the third stepping disc by 10x1 omega measurement disc and 10x1 omega replacement disc, connecting various contacts of the fourth stepping disc to relevant contacts on measurement disc of the third stepping disc, connecting all said measurement discs by wire without using any switch and connecting certain resistances in circuit.

Description

technical field [0001] The present invention relates to an instrument for measuring DC voltage. Background technique [0002] At present, for a potentiometer with four measuring discs, on the connection between the four measuring discs, the intermediate disc is generally switched by switching, which causes the deterioration of the contact resistance and limits the resolution. In order to overcome this problem, large brushes are generally used to increase the contact area, and silver-copper composite materials are used; Application No. 200510062260.2 discloses a new method for a potentiometer with four measuring discs to solve the deterioration of switch contact resistance. The first and second stepping discs are composed of a measuring disc and a substitution disc. The resistance value of the resistance on the measurement disc and the substitution disc is the same. Each time the measuring disc increases a resistance, the substitution disc reduces the same resistance. 3. The...

AI Technical Summary

Problems solved by technology

The four measuring discs are connected between the two measuring terminals, so that the brush on the stepping disc switch is excluded from the measuring circuit, and there is no switching between the resistances on the four measuring discs, so there is no variation; Since the potentiometer step disc switch rotates at an angle of 15° for each step, 24 contacts can be distributed on each layer. There are resistances on each layer, and the inner layer’s resistance is out of tolerance, which will cause inconvenience to maintenance. The fourth stepping plate has half layers of measuring plate, replacement plate and auxiliary plate. The stepping plate switch also needs two layers inside and outside, and the inner layer also has resistance. Maintenance is also inconvenient

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