Patent ID: 8575950
Filing Date: 2013-11-05
Classification: G01R

Abstract:
1. A method of measuring a dynamic resistance variation of an unknown resistor, comprising the steps of: (a) respectively connecting two electrodes with two sides of the unknown resistor; (b) connecting the unknown resistor with the electrodes between a second multi-channel option switch and a first standard resistor; (c) after step (b), taking the unknown resistor into a Split Hopkinson Pressure Bar device; (d) adjusting a third multi-channel option switch for selecting one selectable resistor of the first standard resistor to be electrically connected, adjusting a first multi-channel DIP switch and a second multi-channel DIP switch for selecting one selectable resistor of a resistance box to be electrically connected, adjusting the second multi-channel option switch for selecting one selectable resistor of a second standard resistor to be electrically connected, adjusting an eighth multi-channel option switch for selecting a coarse-adjustment resistor of an adjustable resistor to be electrically connected, adjusting a fifth option switch and a seventh option switch for selecting a current meter to be electrically connected; (e) adjusting an output of a variable voltage source to a desired value, and closing a first switch; (f) adjusting a resistance of the coarse-adjustment resistor till a reading of the current meter is zero; (g) adjusting the eighth multi-channel option switch for selecting a fine-adjustment resistor of the adjustable resistor to be electrically connected; adjusting a resistance of the fine-adjustment resistor till the reading of the current meter is zero to reach a bridge balance; (h) adjusting a ninth multi-channel option switch for selecting a digital multimeter to be electrically connected with the fine-adjustment resistor to measure out the resistance of the fine-adjustment resistor, whereby a resistance of the unknown resistor is measured from a equation: the resistance of the unknown resistor=a resistance of the first standard resistor×a resistance of the second standard resistor/the resistance of the fine-adjustment resistor; (i) adjusting the fifth option switch for selecting a digital storage oscilloscope to be electrically connected; (j) selecting the eighth option switch for selecting one selectable resistor of the adjustable resistor to be electrically connected, wherein the selectable resistor has a resistance nearest to orders of magnitude of the fine-adjustment resistor for prevent the fine-adjustment resistor from destroying by great current; (k) starting the Split Hopkinson Pressure Bar device, wherein an impact bar impacts an entrance bar, then the entrance bar acts on the unknown resistor, then the unknown resistor acts on a transmission bar, then the transmission bar acts on an absorption bar, at last the absorption bar impacts a damper, wherein the damper contributes to buffer and energy absorption; (l) recording an voltage variation curve displayed on the digital storage oscilloscope; and (m) converting the voltage variation curve into an resistance variation curve of the unknown resistor according to conversion formulas between voltage and resistance.