Transformer DC Resistance Tester Features
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QK25XX series transformer DC resistance tester has the following features:
This product controls the voltage output through the PWM mode. The microcontroller changes the PWM duty cycle to change the pulse transformer output voltage to form a DC voltage. This tester uses the potentiometer method to measure the principle of simultaneous sampling of dual-channel data, even in the When the test power supply fluctuates, accurate test results can still be achieved; software-optimized technology enables “one-click†measurement without manual intervention. Comb filter technology is used to effectively eliminate power frequency and high frequency in the measurement system. Harmonic interference, improve the system's anti-jamming capability;
1. Using a fixed voltage-controlled voltage control mode to control the output DC current of high-power FETs, effectively controlling the oscillation phenomenon that may occur in the measurement of DC resistance of large inductive loads.
2, using the potentiometer measurement principle, data synchronization sampling technology, improve the measurement accuracy, so that the sampling data from the test power supply voltage changes;
3, using the measurement mode can be set to conventional and loaded and other specific measurement requirements can be selected, after the completion of the measurement, automatically print and save the measurement results;
4. The use of discrete discrete digital filtering 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. The use of reverse equivalent parasitic potential compensation technology, a good solution to the measurement process due to instrument heating effect on the measurement results.
7. The 20 degree resistance conversion function is used to input the environment during the measurement process, and the resistance value of the tested transformer winding at 20°C can be accurately obtained.
Technical parameters or indicators:
Measurement range: 0-4k? (1820 type measurement range 0-20k?)
Output voltage: 220V AC, electrical output voltage: 18V/25V; AC and DC power supply, output voltage: 15V. Other opening voltage requirements are customized.
Output current: 3A/5A/10A/20A/40A/50A and other models, and divided into 10mA/100mA/1A/3A/5A/10A/20A/40A/50A
Resolution: 0.1uΩ;
Accuracy: 0.2% 
Shanghai Gan Ke Electric Instrument Technology Co., Ltd.