0.1 micro V-resolution voltage measuring instrument

Abstract

A 0.1 micro V-resolution voltage measuring instrument is provided. The 0.1 micro V-resolution voltage measuring instrument is used for direct current voltage measurement. According to the 0.1 micro V-resolution voltage measuring instrument, a first stepping disc is formed by a measuring disc composed of 23 1-ohm resistors; a second stepping disc is composed of a measuring disc and a replacement disc, wherein the measuring disc is composed of 10 0.1-ohm resistors; a third stepping disc is composed of a measuring disc and a replacement disc, wherein the measuring disc is composed of 10 0.1-ohm resistors; each contact on a fourth stepping disc and a five stepping disc is connected with corresponding contacts on the measuring disc in the third stepping disc, such that the fourth stepping disc and the five stepping disc do not need any resistors; the voltage measuring instrument has two measuring ranges; the minimum resolution of the voltage measuring instrument is 0.1 micro V; the second stepping disc adopts special wiring, such that voltage on lead resistors inside the voltage measuring instrument is almost zero; and when the 0.1 micro V-resolution voltage measuring instrument is utilized to perform measurement, the influence of zero potential and thermoelectric potential can be ignored.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] At present, for a voltage measuring instrument with five stepping discs, when the stepping switch is turned, in order to keep the circuit resistance constant, its five stepping discs are composed of a measuring disc and a replacement disc. The stepping discs of some voltage measuring instruments Auxiliary discs are also used in the first disc. Because of the auxiliary discs, the number of switch layers of the step disc is increased, thereby increasing the volume of the instrument, and also complicating the structure of the switch and the instrument, especially in the process of instrument verification. If it is found that the measured data of the step disc is out of tolerance, it is very troublesome to correct the switch inner layer resistance of the step disc. Application No. 200810121910.X discloses a new method for a voltage measuring instrument with five...

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Problems solved by technology

[0002] At present, for a voltage measuring instrument with five stepping discs, when the stepping switch is turned, in order to keep the circuit resistance constant, its five stepping discs are composed of a measuring disc and a replacement disc. The stepping discs of some voltage measuring instruments Auxiliary discs are also used in the first disc. Because of the auxiliary discs, the number of switch layers of the step disc is increased, thereby increasing the volume of the instrument, and also complicating the structure of the switch and the instrument, especially in the process of instrument verification. If it is found that the measured data of the step disc is out of tolerance, it is very troublesome to correct the inner layer resistance of the switch of the step disc

Application No. 200810121910.X discloses a new method for a voltage measuring instrument with five stepping discs that does not use auxiliary discs. Its five stepping discs are all composed of measuring discs and replacement discs, without auxiliary discs. There are resistances on the measuring disc and the substituting disc. The measuring discs on its five stepping discs and the substituting disc form a bridge circuit in the circuit. Its biggest problem is that the error is not independent. Once a point on the measuring disc shows If the value is out of tolerance, it is impossible to determine which resistor is caused by the out-of-tolerance, which brings inconvenience to identification and maintenance

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