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Pressure measuring instrument

A technology for voltage measuring instruments and measuring discs, which is applied in the direction of AC/DC potential difference measuring devices, etc., and can solve problems such as troubles, complex structures of switches and instruments, and increased instrument volume.

Inactive Publication Date: 2010-08-25
骆晓英
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  • Abstract
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Problems solved by technology

[0003] Since the second and third stepping discs have auxiliary discs, the number of layers of the second and third stepping disc switches is increased, thereby increasing the volume of the instrument and complicating the structure of the switch and the instrument. If the measurement data of the second and third stepping discs are found to be out of tolerance during the verification process, it is very troublesome to correct the inner layer resistance of the second and third stepping disc switches

Method used

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Embodiment Construction

[0009] In Figure 1, when the range is ×1, when the three stepping disks and one double-sliding wire disk are all set to "0", the resistance value on the left side between the two brushes of the first stepping disk is equal to 2121Ω, and the resistance value on the right side is equal to 21210Ω, therefore, 10 / 11 of the total current between the two brushes of the first step disc flows on the left side, and 1 / 11 flows on the right side. When three stepping discs and a double-sliding wire disc are placed on other contacts, the resistance increased by each measuring disc is equal to the resistance decreased by the replacement disc, so the resistance on the left and right sides between the two brushes of the first stepping disc The value does not change.

[0010] The standard operating current of the voltage measuring instrument is 1.1mA, the left current between the two brushes of the first step plate is 1mA, and the right current is 0.1mA. The two branches, all the way through t...

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Abstract

The invention relates to a pressure measuring instrument for the measurement of direct current voltage, which has two measuring ranges and comprises three stepping disks and a slide wire disk. Three measuring disks are directly connected with a slide wire of a measuring disk by leads without switch switching, therefore, the pressure measuring instrument does not have variation and thermoelectrical potential influence during measurement; and all the disks form measuring disks and a replacing disk by resistors with same resistance values without an auxiliary disk so that the volume of the whole instrument is shortened.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] Application No. 200510062262.1 discloses a voltage measuring instrument with three stepping discs and a sliding wire disc. Its second and third stepping discs are each composed of a measuring disc, a substituting disc and an auxiliary disc. The measuring disc and the substituting disc The resistance value of the resistance on the top is the same, every time a resistance is added to the measuring disc, the replacement disc will reduce the same resistance, because the second step disc is not set at the 0th contact, and the circuit total resistance when the third step disc is set to a different value It is variable. When the second stepping disc is set at the 0th contact, the total resistance of the circuit remains unchanged when the third stepping disc is set at different indication values. For this reason, the second stepping disc has a measuring disc and a re...

Claims

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Application Information

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IPC IPC(8): G01R17/20
Inventor 骆晓英
Owner 骆晓英
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