Method for measuring super-small DC resistance by series-wound additional resistance difference value method
A technology of adding resistance and DC resistance, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve the problems of unresolved DC double-arm bridge influence, error exceeding, etc., and achieve simple and effective measurement methods. Reliable and precise results for measurement results
Active Publication Date: 2013-07-17
江苏大学扬州(江都)新能源汽车产业研究所
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Problems solved by technology
However, the defect of this measurement method is that although it can solve the influence of the measurement wire resistance on the measurement, it does not solve the influence of the standard resistance inside the DC double-arm bridge ZSD on the measurement, and its effective measurement range is generally 1×10 -4 ~11Ω, when needing to measure less than 1×10 -4 ~10 -7 When the ultra-small resistance of Ω, the error greatly exceeds the allowable value
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[0008] The invention is figure 1 On the basis of the four-point method of the DC bridge ZSD, the standard resistance (0.01Ω) of the first gear step disc of the DC double-arm bridge ZSD is retained, and the accurate measurement is less than 1×10 -4 ~10 -7 A very small resistance of Ω. When measuring the extremely small measured resistance R X when additional resistance R Add , through two measurements, finally get the ultra-small measured resistance R X The specific measurement steps are as follows:
[0009] Step 1: See figure 2 , the DC double-arm bridge ZSD has left and right end connectors, four contacts, one pair is the current connectors C1, C2, the other pair is the potential connectors P1, P2, the current connectors C1, C2 are outside, and the potential connectors P1, P2 are inside . The left end of the DC double-arm bridge ZSD is C1 and P1, and the right end is C2 and P2. Connect the joints at the left and right ends of the DC double-arm bridge ZSD to the ultra...
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The invention discloses a method for measuring a super-small DC resistor by a series-wound additional resistance difference method, which is used for measuring super-small DC resistors the resistance of which ranges from 1*10<-4> to 1*10<-7> and comprises the following steps: connecting joints at the left end and the right end of a DC double bridge to either end of a super-small detected resistorRX; connecting an additional resistor between one end of the super-small detected resistor RX and the joint at one end of the DC double bridge in series to measure the total resistance R1 measured atthe first time; then respectively connecting two ends of the additional resistor in series connection with the double bridge to two ends of the super-small resistor to be detected so as to measure the total resistance R2 measured at the second time; and finally calculating out the super-small detected resistor RX according to the formula RX=R2-R1. The difference between the measurement without the additional resistor and the measurement with the additional resistor determines the resistance of the super-small detected resistor RX, thereby excluding the influences of resistance of standard resistors, all contact resistors and measurement wires in the DC double bridge, and measuring the super-small resistors without increasing current at a current end. The measurement method is simple and effective and the measured result is reliable and accurate.
Description
technical field [0001] The invention belongs to the electrician measurement technique, and relates to a method for measuring DC resistance, especially for resistance values less than 1×10 -4 ~10 -7 Measurement of very small DC resistance between Ω. Background technique [0002] With the development of new technologies, new conductor materials, new large electrical appliances and new large motors are constantly emerging. When testing these new materials and new devices, it is often necessary to measure the resistivity. Some metal samples are affected by geometric shapes. Affected, its resistance is very small, only a few μΩ or less. In order to overcome the influence of the measurement results when measuring small DC resistance by the resistance of the measuring wire, according to the provisions of the Chinese national standard GB 3048.2-83, the "four-point method" must be used for the measurement of small DC resistance below 10Ω, the four-point method as attached figur...
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IPC IPC(8): G01R27/02
Inventor 杨东杨光
Owner 江苏大学扬州(江都)新能源汽车产业研究所