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This project studied the test methods and key technologies of the intelligent high-voltage series insulation resistance tester, and developed a high-performance digital insulation resistance tester based on this technology with MCU as the core. 
The intelligent high voltage insulation resistance tester developed in this project has the following technical breakthroughs:
1. Use PWM method to control the output DC high voltage, change the PWM duty cycle, change the high voltage output in step mode;
2, using dual synchronous sampling technology, improve voltage measurement accuracy, so that the sampling data from the test power supply voltage changes;
3, "one-button" test, complete insulation resistance, absorption ratio, polarization index measurement, complete measurement, automatically save the measurement results;
4. The use of comb filter technology can effectively eliminate the power frequency and high-frequency harmonic interference in the measurement system and improve the system's anti-jamming capability;
5, with special hardware and software design, the system is easy to upgrade, and another with a perfect protection circuit.
6. With the new elimination ring technology, the effect of various surface leakages on the uncertainty of the measurement results can be eliminated, and the measurement reliability and measurement accuracy of ultra-high resistance can be greatly improved.
7. The basic ground potential of the simulated structure is eliminated, the influence of the internal high voltage induced potential on the measurement results is eliminated, and the high reliability of the measurement is ensured.
The main technical features:
This project controls the high voltage output through PWM mode. The microcontroller changes the PWM duty cycle to change the pulse transformer output voltage. This voltage is doubled by the voltage doubler circuit to form a DC high voltage; this test instrument uses a galvanometer comparison method. , Dual simultaneous sampling, even when the test power supply fluctuates, it can still achieve accurate test results; using software optimization technology to achieve "one-button" measurement, insulation resistance, absorption ratio, polarization index can be measured at the same time, without labor Intervention, test results are stored in real time, historical data can be queried at any time; using comb filter technology, can effectively eliminate the frequency and high-frequency harmonic interference in the measurement system, improve the system's anti-jamming capability; using a new elimination of leakage ring technology It can eliminate the influence of various surface leakages on the uncertainty of measurement results, greatly improve the measurement reliability and measurement accuracy of ultra-high resistance, and uses a large number of new devices to reduce the power consumption of the instrument.
Technical parameters or indicators:
Measuring range: 0.001MΩ-2000GΩ;
Output voltage: 250V-10000V; (2500V type, 5000V type, 10000V type) follow-up development of 20000V output impedance: 50Ω;
Output short-circuit current: not less than 5mA;
Resolution: 0.001MΩ;
Accuracy: 2% (actual measurement accuracy up to 1%)
Application range:
The intelligent high-voltage insulation resistance tester developed by the project is mainly used to measure the insulation performance of power transformers, motors, and cables in power systems. 
Shanghai Gan Ke Electric Instrument Technology Co., Ltd.
Intelligent insulation resistance tester
The main research content: