Resistance measuring apparatus
A resistance measuring instrument and circuit technology, applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems affecting the accuracy of test results, and achieve the effect of improving accuracy
Inactive Publication Date: 2012-01-11
江南工业集团有限公司
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Problems solved by technology
The outstanding shortcoming of this test method is: due to the small test current, the voltage generated at both ends of the measured resistance is also very small, so that directional interference potentials such as thermoelectric potentials generated between dissimilar metals and primary battery potentials will overlap. Adding it to the measured potential will affect the accuracy of the test results, and even get a wrong result that the resistance value of the measured resistance is negative
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[0017] Below in conjunction with accompanying drawing, preferred embodiment of the present invention will be further described:
[0018] like figure 1 As shown, a low-resistance measuring instrument includes a precision bidirectional DC constant current source 1, a bidirectional programmable gain amplifier 2, an AD conversion circuit 3, a single-chip microcomputer control circuit 4, a keyboard input circuit 5, a liquid crystal display 6, and a system power supply module 7. The precision bidirectional DC constant current source 1 generates forward and reverse bidirectional constant current under the control of the single-chip microcomputer control circuit 4, and the current is sent to the measured resistance R through the TEST1 and TEST2 terminals X , the measured resistance R X The voltage signals at both ends are sent to the two-way program-controlled gain amplifier 2 through the TEST1 and TEST2 terminals, and the single-chip microcomputer control circuit 4 automatically con...
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The invention relates to a low resistance admeasuring apparatus which belongs to the technical field of automatic measure, can remove the interference of directional potential, is especially suitable for measuring the resistance of explosive devices with lower resistance value or can be widely applied to measuring other resistors with low resistance values. The low resistance admeasuring apparatus is mainly technically characterized by comprising a precise bidirectional direct current constant current source 1, a bidirectional program control grain amplifier 2, an AD conversion circuit 3, a singlechip control circuit 4, and the like; by adopting a single chip microcomputer 4 as a control core and changing the direction of the current and the gain of the bidirectional program control grainamplifier 2 through the bidirectional direct current constant current source 1 and the bidirectional program control grain amplifier 2, voltage values of a measured resistor RX under the test currentin different directions can be obtained; and after two voltage values in the positive direction and the negative direction are averagely calculated by the singlechip control circuit 4, the inference of superposition of the directional potential can be removed and a real voltage value of the measured resistor RX can be obtained, thereby calculating the correct ressitance value. The invention has the characteristics of high detection precision, quick measurement, safe use and the like.
Description
technical field [0001] The invention relates to a low-resistance measuring instrument, which belongs to the technical field of automatic measurement. It can eliminate the interference and influence of directional potential, and is especially suitable for measuring the resistance of pyrotechnic products with small resistance values. It can also be widely used in measuring other low-resistance devices. value resistance. Background technique [0002] The wide application of single-chip microcomputer in the field of automatic measurement and control makes the automatic measurement and control instrument possess a variety of intelligent functions. The pyrotechnics testing instrument uses single-chip microcomputer control technology to realize functions such as automatic zero adjustment and automatic range change. Since the measurement of the resistance value of pyrotechnics is based on Ohm's law, for safety reasons, when measuring the resistance of pyrotechnics, the test current...
Claims
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IPC IPC(8): G01R27/14G01R15/00
Inventor 尹波张奇峰彭育林尹屹
Owner 江南工业集团有限公司