High-voltage digital insulation resistance tester

Abstract

The invention discloses a high-voltage digital insulation resistance tester which comprises a high voltage generating circuit, a protecting circuit, a sampling circuit, a PWM driving circuit, an insulation resistance detecting circuit and a single chip microcomputer. The output ends of a system power supply circuit are respectively connected with the input end of the high voltage generating circuit. The output ends of a high voltage generating module are respectively connected with the input end of the PWM driving circuit and the input end of the protecting circuit. A signal output end of the protecting circuit is connected with the input end of the sampling circuit. A signal output end of the protecting circuit is connected with a signal input end of the insulation resistance detecting circuit. A signal output end of the insulation resistance detecting circuit and a signal output end of the PWM driving circuit are connected with a signal input end of the single chip microcomputer respectively. The high-voltage digital insulation resistance tester can overcome the shortcoming of traditional insulation resistance testing, meanwhile, high measuring accuracy is achieved, and stock results and measuring time can be automatically stored.

Description

technical field [0001] The invention relates to a resistance tester, in particular to a high-voltage digital insulation resistance tester. Background technique [0002] The measurement of insulation resistance is a mandatory inspection item of safety inspection items stipulated in the Metrology Law of my country. The insulation resistance tester, commonly known as the megohmmeter, is a special instrument for measuring insulation resistance. Due to the heavy workload, complicated operation, and human-influenced test results In addition, the existing megohmmeter also has the following disadvantages: 1. The readings are prone to deviation due to the pointer display; 2. Results such as measurement time and measurement data cannot be automatically saved and printed; 3. The measurement voltage is unstable, resulting in fluctuations in results; Fourth, the volume is large and inconvenient to carry. Contents of the invention [0003] The object of the present invention is to provid...

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Problems solved by technology

[0002] The measurement of insulation resistance is a mandatory inspection item of safety inspection items stipulated in the Metrology Law of my country. The insulation resistance tester, commonly known as the megohmmeter, is a special instrument for measuring insulation resistance. Due to the heavy workload, complicated operation, and human-influenced test results In addition, the existing megohmmeter also has the following disadvantages: 1. The readings are prone to deviation due to the pointer display; 2. Results such as measurement time and measurement data cannot be automatically saved and printed; 3. The measurement voltage is unstable, resulting in fluctuations in results; 4. Large size and inconvenient to carry

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