How to measure current with a multimeter?
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 current range selection and reading method are the same as 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. If the multimeter is mistakenly connected in parallel with the load, the small internal resistance of the meter head can cause a short circuit and burn out the instrument. The reading method is as follows: actual value=indicated value x range/full deviation
Precautions for measuring current with a multimeter
1. When measuring current and voltage, it is not allowed to change the range with electricity
2. When selecting a range, it is important to first select the larger one and then the smaller one, in order to make the measured value as close to the range as possible
3. When measuring resistance, it is not possible to measure with electricity. Because when measuring resistance, the multimeter is powered by an internal battery. If it is charged for measurement, it is equivalent to connecting an additional power source, which may damage the meter head.
4. After use, the transfer switch should be placed in the maximum AC voltage position or neutral position.
5. Note that when changing the range of the ohmmeter, it is necessary to perform an ohmic zero adjustment without the need for mechanical zero adjustment.
There are two ways to measure current using a digital multimeter. The first method is to directly use a digital multimeter for current measurement. The multimeter needs to be connected in series with the tested circuit, which means disconnecting the circuit and forming a complete circuit using the test wires of the digital multimeter. In this way, all circuit currents flow through the circuit of the digital multimeter.
