A few tips for multimeter

1. Check the file before measuring, don’t measure without checking

When preparing for measurement, be sure to check whether the measurement type and range selection switch are in the correct position.

2. Do not shift gears during measurement, shift to neutral gear after measurement

Do not arbitrarily turn the selection knob during measurement. Especially when measuring high voltage (such as 220V) or large current (such as 0.5A),
changing the gear and range may easily burn out the multimeter.

3. The dial should be level and the reading should be correct

When using a multimeter, it should be placed horizontally and the line of sight should be facing the needle when counting.

4. The measuring range should be close, and the needle should be more than half

When choosing the measuring range, if you cannot calculate the size of the object in advance, you should choose a larger measuring range, and then gradually switch to a smaller measuring range according to the size of the rotation angle, until the pointer deflects to about 2/3 of the full scale.

5. Measure R without charge, and measure C with discharge first.

It is strictly forbidden to measure resistance when the circuit being tested is energized. When checking large-capacity capacitors on electrical equipment, the capacitors should be discharged before measurement (short-circuit discharge for small capacity).

6. Adjust to zero before measuring R, and adjust to zero when shifting gears

When measuring resistance, you should first turn the switch to the resistance range, short-circuit the two test leads, turn the "Ω" zero adjustment potentiometer, and make the pointer point to zero ohms before measuring. Every time you change the resistance range, you should readjust the ohm zero point.

7. Black must be negative, and the black in the table is connected to "+"

The red test lead is the positive pole and the black test lead is the negative pole, but on the resistance scale, the black test lead is connected to the positive pole of the internal battery.

8. When measuring I, connect them in series, and when measuring U, connect them in parallel.

When measuring current, the multimeter should be connected in series with the circuit being measured; when measuring voltage, the multimeter should be connected in parallel across the circuit being measured.

9. Polarity is not reversed, one-handed operation becomes a habit

When measuring current and voltage, special attention should be paid to the polarity of the red and black test leads. Do not connect them in reverse, and be sure to develop the habit of operating with one hand to ensure safety.