Simple operation instructions of multimeter

2. When changing functions and ranges, the test lead should leave the test point. Select the correct function and range during testing to prevent misoperation.
3. For DC voltage measurement, first turn the range switch to the corresponding DCV range, then connect the test lead across the circuit under test. The voltage and polarity of the point where the red test lead is connected will be displayed on the screen.
4. For AC voltage measurement, first turn the range switch to the corresponding ACV range, then connect the test lead across the circuit under test.
5. For DC current measurement, first turn the range switch to the corresponding DCA position, then connect the meter in series to the circuit under test.
6. For AC current measurement, first turn the range switch to the corresponding ACA position, then connect the meter in series to the circuit under test.
7. For resistance measurement, turn the range switch to the corresponding resistance range, and connect the two test leads across the resistance under test.
8. For capacitance measurement, turn the range switch to the corresponding capacitance range, connect the test lead across the two ends of the capacitance under test, and pay attention to the polarity when necessary.
9. Diode and continuity test, set the range switch to the gear. Connect the red meter to the positive pole of the diode and the black meter pen to the negative pole of the diode. When measuring the continuity of the circuit, connect the meter pen to the two ends of the circuit to be tested. If the buzzer sounds, the circuit is connected, otherwise the circuit is disconnected.
10. Tube amplification measurement, set the range switch to the hFE gear, determine whether the transistor to be tested is NPN or PNP, and insert the emitter, base, and collector into the corresponding holes respectively.