How does a multimeter measure inductance
Put the multimeter in the R×1 gear, connect the red and black test leads to any terminal of the color-coded inductor, and the pointer should swing to the right. According to the measured resistance value, it can be identified in the following three situations:
A The resistance value of the color-coded inductor under test is zero, and there is a short-circuit fault inside it. B The DC resistance value of the measured color code inductor is directly related to the diameter of the enameled wire used to wind the inductor coil and the number of winding turns. As long as the resistance value can be measured, the measured color code inductor can be considered normal .
2 Detection of mid-circumference transformers
A Turn the multimeter to the R×1 gear, check the on-off status of each winding one by one according to the arrangement of the winding pins of the mid-week transformer, and then judge whether it is normal. B detection of insulation performance
Put the multimeter in the R×10k gear, and do the following state tests:
(1) The resistance value between the primary winding and the secondary winding;
(2) The resistance value between the primary winding and the casing;
(3) The resistance value between the secondary winding and the casing.
There are three situations in the above test results:
(1) The resistance value is infinite: normal;
(2) The resistance value is zero: there is a short-circuit fault;
(3) The resistance value is less than infinity, but greater than zero: there is a leakage fault.
