Skills When Measuring DC with a Multimeter

Skills when measuring DC with a multimeter
1. Perform mechanical zero adjustment.
2. Select the appropriate range gear.
3. When using the current block of the multimeter to measure the current, the multimeter should be connected in series in the quilt measurement circuit, because only the series connection can make the current flowing through the ammeter to be the same as the current of the branch under test. When measuring, the branch under test should be disconnected, and the red and black test leads of the multimeter should be connected in series between the two disconnected points. In particular, it should be noted that the ammeter cannot be connected in parallel in the quilt test circuit, it is very dangerous, and it is very easy to burn the multimeter.
4. Pay attention to the polarity of the electricity being measured.
5. Correct use of scales and readings.
6. When the 2.5A block of DC current is selected, the red test lead of the multimeter should be inserted into the 2.5A measurement jack, and the range switch can be placed on any range of the DC current block.
7. If the DC current measured by the quilt is greater than 2.5A, the 2.5A gear can be extended to 5A gear. The method is very simple, the user can connect a 0.24 ohm resistor between the "2.5A" jack and the black test pen jack, so that the gear becomes a 5A current gear. The connected 0.24A resistor should be a wire-wound resistor of more than 2W. If the power is too small, it will burn out.
8. The three basic functions of multimeters are to measure resistance, voltage and current. Many new functions have been added to multimeters now, especially digital multimeters, such as measuring capacitance value, triode magnification, diode voltage drop, etc. The digital multimeter can broadcast the measurement results in language.