Three-range voltage measuring instrument
A voltage measurement and range technology, applied in the direction of changing range circuits, measuring current/voltage, instruments, etc., can solve the problems of inconvenient identification and maintenance, deterioration of contact resistance, and independent errors.
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 ×10 range, the resistance from node C to node A is 20Ω, the resistance between nodes A and B is 100Ω, the resistance from node C to node B through node A is 120Ω, and the resistance from node C to node B is 120Ω. R 8 , R 10 , R 11 to Double Pole Three Throw Switch K 1 K 1-1 The resistance value between the layer × 10 range contacts is 1200Ω, the current when the working current of the three-range voltage measuring instrument is standardized is 11mA, and the 10mA current flows through the five step discs to the range changeover switch K 1 K 1-1 Layer × 10 range contacts, 1mA flows through resistance R 8 , R 10 , R 11 to Double Pole Three Throw Switch K 1 K 1-1 Layer x 10 range contacts.
[0010] In the ×1 range, the resistance value from node C to node A to node B is 120Ω, plus the resistance R 11 The total resistance value is 1200Ω, from node C through resistor R 8 , R 10 to Double Pole Three Throw Switch K 1 K 1-1 The resistance value be...
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Provided is a three-range voltage measuring instrument used for measuring direct voltage. A first stepping disc includes a measuring disc composed of 18 10-ohm resistors. A second stepping disc includes a measuring disc and a replacing disc, wherein the measuring disc is composed of 10 1-ohm resistors. Contacts of third, fourth and fifth stepping discs 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): G01R19/00G01R15/08
Inventor 孙笑声
Owner 孙笑声