Potentiometer with four step plates

Abstract

The invention relates to a potentiometer with four step plates for DV voltage measurement; resistors on the step plates are designed to have the resistance of the integral power of 10; standard resistors can be compared on a bridge, thereby facilitating instrument manufacturing, improving the manufacturing precision of the resistors on measuring plates and replacement plates, and improving the measurement accuracy of the complete potentiometer; the four measuring plates are directly connected by leads and are not switched by switches, so that no switch contact resistance difference impact exists when the potentiometer is used for measurement; because contacts and whole rings are made of the same material, heat thermo emf and variable heat thermo emf produced by the movement of a brush arethe same and in reverse directions; and therefore, the potentiometer can measure micro-voltage.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] Invention patent ZL200510062367.7 was published on May 7, 2008. It is a potentiometer with four stepping discs. Its third and fourth stepping discs each have a measuring disc, a substituting disc and an auxiliary disc. Composition, the resistance value on the measuring disk and the replacement disk is the same, every time a resistance is added to the measuring disk, the replacement disk will reduce the same resistance, since the third step disk is not set at the 10th point, the fourth step disk is set The total resistance of the circuit changes when the indication value is different. When the third step dial is set at the 10th point, the total resistance of the circuit remains unchanged when the fourth step dial is set at different indication values. Therefore, the third step dial has a measuring dial. 1. In addition to the replacement disk, an auxiliary dis...

AI Technical Summary

Problems solved by technology

[0003]Because the third and fourth step discs have auxiliary discs, the layers of switches of the third and fourth step discs are increased, thereby increasing the instrument’s The volume also complicates the structure of the switch and the instrument, especially if the measurement data of the third and fourth step discs are found to be out of tolerance during the instrument verification process, it is very important to correct the inner layer resistance of the third and fourth step disc switches. troublesome

The application number 200820120442.4 is more advanced than ZL200510062367.7, but the current of the two potentiometers flows through the brush of the first stepping disc, and is divided into two paths, passing through each stepping disc, and converging at the first stepping disc. The measuring disc brush of the disc; the problem it brings is that the resistance values ​​of the second, third and fourth discs are composed of two identical numbers, and the resistance value is small, and there is no standard resistance to compare; if the transition standard resistance is used , then the lead error between the two transition standard resistors is difficult to handle; therefore, the resistance values ​​of the second, third and fourth discs of the potentiometer are difficult to make accurate

Images