What does each gear of the multimeter measure?
Digital multimeter measurement range: DC voltage (DCV), AC voltage (ACV), DC current (DCA), AC current (ACA), resistance (Ω), diode forward voltage drop (VF), transistor emitter current amplification factor (hrg), capacitance (C), conductance (ns), temperature (T), frequency (f), buzzer file (BZ) for checking circuit continuity, low power method resistance file (L0Ω). Some instruments have inductance file, signal file, AC/DC automatic conversion, and capacitance file automatic conversion range.
Most digital multimeters have added the following novel and practical test functions: reading hold (HOLD), logic test (LOGIC), true effective value (TRMS), relative value measurement (RELΔ), automatic shutdown (AUTO OFF POWER), etc.
Precautions for multimeter use:
(1) Before using the multimeter, "mechanical zero adjustment" should be performed first, that is, when there is no electricity to be measured, make the pointer of the multimeter point to the position of zero voltage or zero current.
(2) In the process of using the multimeter, do not touch the metal part of the test lead with your hands, so that on the one hand, the accuracy of the measurement can be guaranteed, and on the other hand, personal safety can also be guaranteed.
(3) When measuring a certain amount of electricity, it is not possible to change gears while measuring, especially when measuring high voltage or large current, more attention should be paid. Otherwise, the multimeter will be damaged. If you need to change gears, you should disconnect the test leads first, and then measure after changing gears.
(4) When using the multimeter, it must be placed horizontally to avoid errors. At the same time, attention should be paid to avoid the influence of the external magnetic field on the multimeter.
(5) After the multimeter is used, the transfer switch should be placed in the maximum gear of the AC voltage. If it is not used for a long time, the battery inside the multimeter should also be taken out to prevent the battery from corroding other components in the meter.
