Must-Know Precautions for Multimeters for Repair Personnel
1, Voltage below 36V is considered safe voltage: When measuring voltages above 36V DC and 25V AC, it is necessary to check whether the probes are reliably connected, correctly connected, and well insulated to avoid electric shock
2, When changing functions and ranges: The probe should be away from the testing point, and the correct function and range should be selected during testing to prevent accidental operation,
3, DC voltage measurement: First, turn the range switch to the corresponding DCV range, and then connect the test probe across the tested circuit. The voltage and polarity at the point where the red probe is connected are displayed on the screen
4, AC voltage measurement: First, turn the range switch to the corresponding ACV range, and then connect the test probe across the tested circuit
5, DC current measurement: First, turn the range switch to the corresponding DCA position, and then connect the instrument in series to the tested circuit
6, AC current measurement: First, turn the range switch to the corresponding ACA position, and then connect the instrument in series to the tested circuit
7, Resistance measurement: Turn the range switch to the corresponding resistance range and connect the two probes across the measured resistance
8, Measurement: Turn the range switch to the corresponding capacitor range, connect the test probe across the tested capacitor and both ends for measurement, and pay attention to polarity if necessary
9, Pole tube and on-off test: Set the range switch to the gear Connect the red gauge to the positive terminal and the black probe to the negative terminal of the diode When testing the continuity of a circuit, connect the probe to both ends of the circuit to be tested. If the buzzer sounds, the circuit is open; otherwise, the circuit is open
10, Measurement of transistor amplification factor: Set the range switch to the hFE position to determine whether the transistor being measured is NPN or PNP. Insert the emitter, base, and collector into the corresponding holes.
