14 unique skills used by the multimeter (II)

7. When measuring the resistance, the zero adjustment should be performed every time the gear is changed. Replace the battery with a new one when it is not adjusted to zero. R is first adjusted to zero, and shifting needs to be zeroed. When measuring the resistance, first turn the transfer switch to the electrical block, short the two test leads, and turn the "Ω" to zero the potentiometer, so that the pointer points to zero and then measure. The ohmic zero point should be readjusted each time the electrical block is replaced;

8. After the multimeter is used, the switch should be placed at the maximum limit of the AC voltage;

9. If it is not used for a long time, the internal battery of the multimeter should be taken out to prevent the battery from corroding other devices in the watch;

10. The measurement first look at the block, do not see the measurement. Each time you pick up the test leads to prepare for measurement, be sure to check the measurement category and the range selector switch to the right position. In order to be safe, this habit must be developed;

11. The dial should be level and the readings should be aligned. Use the multimeter to rotate horizontally, and the line of sight should be facing the hand when reading.

12. Test R without electricity, measure C first discharge. It is strictly forbidden to measure the resistance when the circuit under test is charged. When inspecting large-capacity capacitors on electrical equipment, the capacitor should be short-circuited and then measured.

13. The measurement I should be connected in series, and the measurement U should be connected in parallel. When measuring current, the multimeter should be connected in series to the circuit under test; when measuring voltage, the multimeter should be connected in parallel at both ends of the circuit under test;

14. The polarity is not reversed, one-handed into a habit. When measuring current and voltage, pay special attention to the polarity of the red and black test leads. It is necessary to develop the habit of one-hand operation to ensure safety.