voltage measuring instrument
A voltage measurement and instrument technology, applied in the field of voltage measurement instruments, can solve problems such as uncertainty, contact resistance deterioration, and non-independent errors.
Active Publication Date: 2017-01-25
山东昌达自动化技术有限公司
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Problems solved by technology
[0002] At present, for a voltage measuring instrument with five step discs, the intermediate disc generally uses a switch for the connection between the five step discs. Currently, for a voltage measuring device with multiple step discs, between multiple step discs In the connection between the intermediate disks, switches are generally used, 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 numbers 200510062236.9, 200810121910.X and other invention patents disclose a voltage measuring device with multiple stepping discs to solve the switch contact resistance A new method of variation. Its multiple stepping discs are composed of measuring discs and substitution discs. The disk constitutes a bridge circuit in the circuit. Its biggest problem is that the error is not independent. Once the indication 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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[0007] exist figure 1 , 20×5Ω adjustable resistor R P1 , represents the adjustable resistor R P1 There are 20 resistors with a resistance value of 5Ω connected in series. Similarly, 21×0.25Ω adjustable resistor R P2 , represents the adjustable resistor R P2 There are 21 resistors with a resistance value of 0.25Ω connected in series, and 10×1Ω on the first stepping plate and the second stepping plate, indicating that there are 10 resistors with a resistance value of 1Ω connected in series on the measuring plate and the replacement plate. exist figure 1 In , the thick black line on the stepping disk indicates the metal contact ring, the small hollow circle indicates the metal contact, and the double-headed arrow indicates the metal brush.
[0008] exist figure 1 In the first, second, and third stepping disks, the resistance increased by each step of the measuring disk is equal to the resistance decreased by each step of the replacement disk, so the total resistance of the c...
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Provided is a voltage measuring instrument for direct current voltage measurement. Six stepping panels are provided. Each stepping panel is composed of a measuring panel and a replacing panel identical in structure with the measuring panel. A 1omega resistor is welded between adjacent contacts of the measuring panels and the replacing panels of first two stepping panels respectively, and contacts of the measuring panels and the replacing panels of last three stepping panels are connected with corresponding contacts of the measuring panel and the replacing panel of a third stepping panel, so that effects of switch contact resistance, variation and thermal electromotive force of the voltage measuring instrument on the voltage measuring instrument are small.
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 step discs, a switch is generally used for the connection between the five step discs. Currently, for a voltage measuring device with multiple step discs, between multiple step discs In the connection between the intermediate disks, switches are generally used, 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 numbers 200510062236.9, 200810121910.X and other invention patents disclose a voltage measuring device with multiple stepping discs to solve the switch contact resistance A new method of variation. Its multiple stepping discs are composed of measuring discs and substitution discs. The disk constitutes a ...
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IPC IPC(8): G01R17/20
Inventor 袁乐香骆孝峰
Owner 山东昌达自动化技术有限公司