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US 8,575,950 B2Granted
Static/dynamic resistance measuring apparatus and method
AssigneeNingbo University
InventorsJiankang Chen, Jintao Lei, Minghua Zhang
Life of this patent
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Abstract
A resistance measuring apparatus which includes a variable voltage source, a signal display circuit, a bridge consisting of a first standard resistor, a second standard resistor, an adjustable resistor and the unknown resistor, a bridge balance display circuit and a dynamic voltage display circuit alternatively connected within the bridge. The resistance measuring apparatus is adapted to measure static resistance and dynamic resistance variation of an unknown resistor in the case of external environment having changed dramatically.
Claims13
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.
13 more elements
Dependencies are inferred from the claim text.