The contents of the measurement generally include:

On-off condition of each phase winding; Switching between phases; Insulation resistance of winding to ground.

General usage: If a loop (normally a path) has an open circuit, use a low-resistance gear; If there is resistance in the circuit, select the appropriate gear. For a simple example, if the resistance of the circuit itself is 250Ω, it will of course display "1" when measured with a buzzer gear of 200Ω.

To measure the insulation resistance to the ground (under normal circumstances, no path should be formed), we try to choose the ω range with the largest range, such as 20K and x 10K range.

According to the object of measurement, there is a theoretical basis for choosing the appropriate range.

What needs to be added is that you are using a digital clamp multimeter, and the statement that "the resistance range is only r×20k and the buzzer range is r×200" is incorrect. 20K 200 represents the displayed value of the maximum resistance value of this gear, which has nothing to do with the ratio, which is quite different from ordinary pointer multimeter's representation of the resistance gear as x10x1k.

A little wordy, I hope I can help you!