Preparations before using the multimeter (AC millivoltmeter):
(1) Be familiar with the meaning of the symbols on the dial and the main functions of the knobs and selector switches.
(2) Carry out mechanical zero adjustment. That is, when there is no electricity to be measured, make the pointer of the multimeter point to the position of zero voltage or zero current.
(3) According to the type and size of the measured, select the gear and range of the transfer switch, and find the corresponding scale line. To measure the voltage, align the tip of the range selector switch within the five-step range marked with V. If measuring AC voltage, it should point to V. And so on, if you want to change the resistance, the switch should point to the Ω range. The measured current should point to mA or UA.
(4) Select the position of the test lead jack.
(5) How to understand the multimeter reading
According to the approximate value of the circuit under test, select a suitable range position. Note that the index value indicated by the tip of the range switch is the corresponding value of the full-scale reading of the needle on the meter head. When reading the meter, you can read the real value as long as it is converted accordingly.
For example, the maximum value of each dry cell is 1.5V, so it can be placed in the 5V range. At this time, the 500 of the full scale reading of the needle on the panel should be read as 5. That is 100 times smaller. If the needle points at the 300 mark, it reads 3V. Except for the resistance gear, all gears of the range switch read the measurement results in this way.
