Electronic megohmmeter

A megohmmeter and electronic technology, used in the measurement of electrical variables, resistance/reactance/impedance, measurement devices, etc., can solve the problems of low measurement accuracy and large weight of the megohmmeter.

Inactive Publication Date: 2016-12-21
高玉琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The megohmmeter with this structure is heavy, and its output voltage is related to the speed of the hand generator, and the measurement accuracy is not high.

Method used

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  • Electronic megohmmeter

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Embodiment Construction

[0008] The specific embodiment of the present invention will now be described in conjunction with the accompanying drawings.

[0009] An electronic megohmmeter includes an oscillation circuit, a voltage boosting circuit, a rectification and filtering circuit and a display unit.

[0010] The oscillating circuit includes an operational amplifier A1, a resistor R1 is connected between the inverting input terminal and the output terminal of the operational amplifier A1, the inverting input terminal of the operational amplifier A1 is grounded through a capacitor C1, and the non-inverting input terminal and output terminal of the operational amplifier A1 Resistor R3 is connected between them, the non-inverting input terminal of the operational amplifier A1 is connected to the power supply VDD through the resistor R2, the non-inverting input terminal of the operational amplifier A1 is connected to one end of the resistor R4, the other end of the resistor R4 is grounded, and the output...

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Abstract

Disclosed is an electronic megohmmeter for measuring whether an insulation resistor or a detection device leaks electricity. The electronic megohmmeter comprises an oscillation circuit, a boost circuit, a rectification filtering circuit, a display unit and a voltage stabilization unit, wherein the oscillation circuit is composed of an operational amplifier A1, resistors R1 to R4 and a capacitor C1, the boost circuit is composed of a triode T1 and a boost transformer B1, the secondary coil of the boost transformer outputs high-voltage AC power, the rectification filtering circuit performs rectification filtering on the high-voltage AC power as measurement voltages, the voltage stabilization unit is composed a feedback coil, an operational amplifier A2 and a triode T2, the operational amplifier A2 compares feedback voltages with reference voltages, an equivalent resistor between the collector electrode and the emitter electrode of the triode T2 is changed, and the equivalent resistor is connected in series with the resistor R4, such that the oscillation frequency is adjusted and voltage stabilization of the secondary coil is realized. High voltages of the electronic megohmmeter are generated through an electronic line, the weight is light, manual power generation is unnecessary during application, the application is convenient, and the measurement precision is quite high.

Description

technical field [0001] The invention relates to an electronic megohmmeter, which is used to measure insulation resistance or detect whether equipment is leaking electricity. Background technique [0002] The traditional megohmmeter is generally a generator type, and its structure includes a hand-operated generator and a microammeter. Level, the microammeter is connected in series in the output voltage loop, and the microammeter displays the current flowing through the measured object. Since the output voltage is a fixed value, the insulation resistance of the measured object can be obtained according to Ohm's law. The megohmmeter with this structure is heavy, and its output voltage is related to the speed of the hand generator, so the measurement accuracy is not high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an electronic megohmmeter circuit, which is composed of electronic components, has light weight, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 高玉琴
Owner 高玉琴
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