Power line electricity on-off testing device
A technology of on-off testing and power cords, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., which can solve the problems of slow speed and inconvenient test methods
Active Publication Date: 2014-06-18
惠州市普安电子有限公司
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Problems solved by technology
[0002] The power cord is a wire that transmits current. High-voltage tests, insulation resistance measurements, on-off tests, etc. must be carried out in production; usually, when testing the on-off of the power cord, if one end is a plug and the other end is a wire, the end of the wire is usually connected. Press on the copper wire brush, and use a multimeter to measure the plug end; check the voltage and other information displayed by the multimeter to judge whether it is on or off; if the other end is a certain connector, use the corresponding connector to short-circuit it. Measure the plug end with a multimeter, this test method is slow and inconvenient
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[0012] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.
[0013] Such as figure 1 As shown, IC1 and IC2 can use operational amplifiers with relatively high common-mode rejection, and the power supply voltage does not exceed ±15V. IC1, R1, and C1 form a 10KHz signal generator, R2 is a current-limiting resistor, and DW1-2 is 2 pieces The 3.3V Zener tube is used to limit the signal amplitude.
[0014] P1 and P2 are respectively connected with the black and red sticks of the multimeter. When testing, connect the power line between them. The power line is a capacitor, which forms a proportional voltage divider circuit with C2. The measured signal is linearly amplified by IC2 after bein...
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The invention relates to a power line electricity on-off testing device which comprises two operational amplifiers. A resistor and a first capacitor are respectively connected with the in-phase input end of the first operational amplifier, a signal generator is formed by the first operational amplifier, the resistor and the first capacitor, a current limiting resistor and two voltage stabilizer tubes are connected between the inversed-phase input end and the output end of the first operational amplifier, an adjustable resistor and a second capacitor are connected to the in-phase input end of the second operational amplifier, a tested power line is connected between the adjustable resistor and the current limiting resistor, a proportional bleeder circuit is formed by the tested power line and the second capacitor, a rectifying circuit is connected with the output end of the second operational circuit, the output end of the rectifying circuit is connected with a voltmeter, the output end of the voltmeter is connected with a time-base circuit, and two light emitting diodes are connected with the output end of the time-base circuit. According to the power line electricity on-off testing device, the basic principle that capacitance exists between two parallel lead wires is adopted, the on-off situation of the power line can be tested simply by testing a power line plug, and fastness and convenience are achieved.
Description
technical field [0001] The invention relates to a test device, in particular to a device for quickly testing the continuity of a power line. Background technique [0002] The power cord is a wire that transmits current. High-voltage tests, insulation resistance measurements, on-off tests, etc. must be carried out in production; usually, when testing the on-off of the power cord, if one end is a plug and the other end is a wire, the end of the wire is usually connected. Press on the copper wire brush, and use a multimeter to measure the plug end; check the voltage and other information displayed by the multimeter to judge whether it is on or off; if the other end is a certain connector, use the corresponding connector to short-circuit it. Using a multimeter to measure the plug end is a slow and inconvenient test. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a device capable of quickly detecting whether the pow...
Claims
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IPC IPC(8): G01R31/02
Inventor 姜清
Owner 惠州市普安电子有限公司