How to use a multimeter! How to measure short circuit and resistance!
(1) Familiarize oneself with the meanings of the symbols on the dial and the main functions of the knobs and selector switches.
(2) Perform mechanical zeroing.
(3) Select the gear and range of the conversion switch based on the type and size being measured, and find the corresponding scale line.
(4) Select the position of the probe socket.
(5) Measuring voltage: When measuring voltage (or current), it is important to choose the appropriate range. If a small range is used to measure high voltage, there is a risk of burning the meter; If a large range is used to measure small voltages, the pointer deflection will be too small to read. The selection of measuring range should try to deflect the pointer to about 2/3 of the full scale.
(6) Current measurement: When measuring DC current, place one switch of the multimeter in the DC current range and the other switch in the appropriate range of 50uA to 500mA. The selection and reading method of the current range is the same as that of voltage. When measuring, the circuit must be disconnected first, and then the multimeter should be connected in series to the tested circuit in the direction of the current from "+" to "-", that is, the current flows in from the red probe and out from the black probe.
(7) Resistance measurement: When measuring resistance with a multimeter, the following method should be used: a. Select the appropriate magnification gear. Zero adjustment of b ohms. Before measuring resistance, short circuit the two probes and adjust the "Ohm (Electrical) Zero Knob" so that the pointer is just pointing to the zero position on the right side of the Ohm scale line.
If the pointer cannot be adjusted to zero, it indicates that the battery voltage is insufficient or there is an internal problem with the instrument. And every time the magnification gear is changed, it is necessary to perform Ohmic zeroing again to ensure accurate measurement. C reading: Multiply the reading on the meter by the multiplier to obtain the resistance value of the measured resistor.
