How to measure the values of inductance and resistance with a multimeter?
A pointer multimeter should consist of a meter head, measuring circuit components, and a conversion switch. It comes in two forms: portable and pocket sized. The dial, zeroing knob, test socket, etc. are installed on the panel. The functions of various multimeters are slightly different, but the most basic functions are four: first, to test DC current, second, to test DC voltage, third, to test AC voltage, and fourth, to test AC/DC resistance. Some multimeters can measure audio level, AC current, capacitance, inductance, and special values of transistors. Due to these different functions, the layout of multimeters also varies!
1. When measuring resistance with a multimeter, the first step is to short-circuit the probe and turn the zero potentiometer to zero, so that the pointer is at the zero ohm position. If the pointer still cannot reach 0, this phenomenon is usually caused by insufficient battery voltage inside the meter. A new battery should be replaced for accurate measurement. And after each gear shift, the zero potentiometer needs to be readjusted to zero. When selecting the ohm gear, try to choose the position where the measured resistance value is close to the center resistance reading of the dial to improve the accuracy of the test results; If the resistor is on the circuit board, one foot should be soldered open before testing. Otherwise, if there are other shunt devices on the resistor, the reading will be inaccurate! When measuring resistance, do not touch the pins of the probe and resistor separately with both hands and fingers, as this may hinder the shunt of human resistance and increase errors.
2. Measure inductance: Place the multimeter in the R × 1 position, and connect the red and black probes to either end of the inductor. At this point, the pointer should swing to the right. Based on the measured resistance value,
It can be distinguished into the following three situations:
The resistance value of the tested inductor is zero, indicating a short-circuit fault inside. The magnitude of the DC resistance of the tested inductor is directly related to the diameter of the enameled wire used to wrap the inductor coil and the number of turns wound. As long as the resistance value can be measured, the tested inductor can be considered normal.
