Voltage measuring instrument
A voltage measurement and instrument technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve the problems of resolution limitation, contact resistance deterioration, identification and maintenance inconvenience, etc.
Inactive Publication Date: 2014-05-07
孙笑声
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Problems solved by technology
[0002]Currently, for a voltage measuring instrument with five step discs, the intermediate disc is generally switched by a switch on the connection between the five step discs, thus resulting in Variation in contact resistance, limiting 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 number 200810121910.X discloses a new method for solving the deterioration of switch contact resistance with a voltage measuring instrument with five step discs , its five stepping discs are composed of measuring discs and substituting discs, excluding auxiliary discs, each measuring disc and substituting discs have resistance, the measuring discs and substituting discs on its five stepping discs The disk constitutes a bridge circuit in the circuit. Its biggest problem is that the error is not independent. Once the value of a certain point of the measuring disk is out of tolerance, it is impossible to determine which resistance is caused by the out-of-tolerance, which brings inconvenience to identification and maintenance.
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[0009] figure 1 In the second stepping disc, the resistance value of each step of measuring disc II and substituting disc II' is the same, which is 0.1Ω, and the resistance value of each step of measuring disc II in the circuit is equal to that of substituting disc II' The resistance decreases with each step, so the resistance value between the nodes A and B remains unchanged at each step of the second step disk.
[0010] The standard operating current of the voltage measuring instrument is designed to be 10mA, and the operating current is divided into two paths at node D, and one path passes through a 760Ω resistor R 2 And the resistance on the measuring disc I of the first step disc is 990Ω, and the other path passes through the resistance R 1 is 10Ω, so the current flowing through the resistance of the measuring disc I is 0.1mA flowing through the resistance R 1 The current above is 9.9mA, and the 10mA working current of the voltage measuring instrument is divided into fi...
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Provided is a voltage measuring instrument used for measuring direct voltage. A first stepping disc includes a measuring disc composed of 23 10-ohm resistors. A second stepping disc includes a measuring disc and a replacing disc, wherein the measuring disc is composed of 10 0.1-ohm resistors. Contacts of third, fourth and fifth stepping disc are connected with corresponding contacts of the measuring disc of the second stepping disc so that the third, fourth and fifth stepping discs need no resistor, total voltage drop on a lead resistor inside the voltage measuring instrument is almost zero, and the influence of zero potential and thermoelectric potential can be ignored when measurement is carried out by the voltage measuring instrument.
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 disks, the connection between the five stepping disks is generally switched by switches in the middle disk, which will cause the deterioration of the contact resistance and limit 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 number 200810121910.X discloses a new method for solving the deterioration of switch contact resistance with a voltage measuring instrument with five step discs , its five stepping discs are composed of measuring discs and substituting discs, excluding auxiliary discs, each measuring disc and substituting discs have resistance, the measuring discs and substituting discs on its five stepping discs The disk constitutes a bridge circuit in the circui...
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IPC IPC(8): G01R19/00
Inventor 孙笑声雷高贤
Owner 孙笑声