How do you measure a coil with a multimeter?
With resistance measurements, take a normal coil to measure the resistance, and then measure the suspected problem. The resistance is normal when the difference is not great.
The multimeter is generally measuring DC resistance value is small, if the high voltage coil or a few ohm maximum generally hundreds of thousands, of high accuracy requirements, with the design value or other no fault by comparing the measured value of the same coil, low voltage coil is generally milliohm level, with a multimeter is not measured out the exact value (error), need special DC resistance instrument. But can not say that the measured value with the same or similar design value can be concluded that the coil is good, sometimes turns or interlayer insulation damage with a multimeter is not measured out, need to use the frequency tester for example 3 frequency generator and so on, in order to find the fault point.
With resistance measurement, take a normal coil to measure the resistance, and then measure the suspected problem, the resistance is not normal when the difference is normal.With a multimeter, you can detect the motor is good or bad:1 、 measuring coil, three-phase motor three coil resistance is not the same?.2 、 measuring whether there is a resistance between the coil and the shell, this resistance is greater than 5M ou.
