What is the relationship between the output short-circuit current of a megohmmeter and the measured data when measuring the resistance value of a capacitive load, and why? The magnitude of the short-circuit current output by a megohmmeter can reflect the large internal resistance of the internal output high voltage source of the megohmmeter. When the tested object has a capacitance, at the beginning of the testing process, the high voltage source inside the megohmmeter needs to charge the capacitor through its internal resistance and gradually charge the voltage to the rated high voltage output of the megohmmeter. The magnitude of the short-circuit current output by a megohmmeter can reflect the large internal resistance of the internal output high voltage source of the megohmmeter. When the tested object has a capacitance, at the beginning of the testing process, the high voltage source inside the megohmmeter needs to charge the capacitor through its internal resistance and gradually charge the voltage to the rated high voltage output of the megohmmeter. Obviously, if the capacitance value of the test sample is large or the internal resistance of the high-voltage source is high, the charging process will take longer. In the decoration work of electronic appliances, multimeters play a particularly important role.  

A megohmmeter is a specialized instrument for measuring insulation resistance and is widely used. However, traditional hand cranked pointer megohmmeters require a hand cranked generator to maintain a speed of 120r/s in order to maintain normal output voltage. The measurement range has large errors and the absorption ratio needs to be calculated separately after measurement, making it inconvenient to use.