The pointer type multimeter is composed of a table and a head, a measuring circuit component and a changeover switch. Its shape is portable and pocket-sized. The dial, the zero-twist, the test jack, etc. are mounted on the panel. The functions of various multimeters are slightly different, but the most basic functions are four: one is to test DC current, the other is to test DC voltage, and the third is to test. AC voltage, the fourth is to test AC DC resistance. Some multimeters can measure audio levels, AC currents, capacitors, inductors, and special values ​​of transistors. Due to these different functions, the layout of the multimeter is also different!
1. When measuring the resistance with a multimeter, first short the test leads, turn the zero potentiometer to zero, and make the pointer on the ohmic zero. If the pointer still does not reach 0, this phenomenon is usually due to the battery inside the watch. If the voltage is insufficient, it should be replaced with a new battery to measure accurately. Moreover, the zero adjustment potentiometer needs to be re-adjusted after each shift. When selecting the ohmic gear position, try to select the resistance value to be measured near the center of the dial to improve the accuracy of the test results; if the resistor is on the circuit board, one of the feet should be welded to test. Otherwise, there are other shunt devices by the resistor, and the reading is not accurate! When measuring the resistance value, do not touch the lead of the test leads and the resistors with the fingers of both hands, so as to reduce the error of the body resistance shunt.
2. Measure the inductance: Place the multimeter in the R×1 block. The red and black test leads are connected to any of the terminals of the inductor. At this time, the pointer should swing to the right. According to the measured resistance value, the following three cases can be identified:
A? The measured inductor resistance is zero and there is a short-circuit fault inside. B? The magnitude of the DC resistance of the inductor under test is directly related to the wire diameter and number of windings used to wind the inductor coil. As long as the resistance value can be measured, the inductor under test can be considered normal.
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