How to use a multimeter to measure current How to use a multimeter to measure current
The multimeter can measure the resistance of the measured object, AC and DC voltage, and measure DC voltage. Some multimeters can also test the main parameters of transistors and the capacitance of capacitors. So how does the multimeter measure the current? Let's take a look at the method of measuring current with a multimeter.
When measuring the current, if you don’t know how much the current is, first adjust the multimeter to the current gear, then slowly adjust it from high to low, break the line, and the positive and negative poles of the test pens are connected in the line. Be sure to distinguish the communication with DC.
1. Select the range
The DC current range of the multimeter is marked with three ranges of 1mA, 1omA, and 100mA. Select the size in the circuit, and if you don't know it, choose the largest range.
2. Measurement method
(1) Connect the circuit so that the light-emitting diodes can glow normally.
(2) Select the range of the multimeter.
(3) Disconnect the lead wire between the junction point of the potentiometer and the negative electrode of the LED, and the LED will go out.
(4) Connect the multimeter in series to the breakpoint. The breakpoint connected to the positive pole of the power supply should be connected to the red test lead, and the breakpoint connected to the negative pole of the power supply should be connected to the black test lead. The diode will glow again. The scale value pointed by the pointer of the multimeter is the current value of the light-emitting diode.
(5) Read out the current value passing through the LED.
