What is the on-off setting of the multimeter? What setting does the multimeter use to measure continuity? The principle of the on-off setting of the multimeter

To test the continuity of the wire, you can use the resistor x1 level, which is called the ohm level.

The ohm level measures resistance value, and the x1 level measures low resistance value. The resistance of the wire should be low. Short wires only have a few tenths of ohms. The resistance cannot be measured with an ordinary pointer multimeter. If the pointer hits zero, it means there is a circuit. If the pointer is less than zero, it means there is resistance in the circuit. If the pointer does not move, it means there is an open circuit.

Use a digital multimeter to measure it. A very small resistance value indicates a path, a certain resistance value indicates resistance in the circuit, and a very large resistance value indicates an open circuit.

Some digital multimeters have buzzers. The buzzer is generally in the 2 kω range. When measuring a line (or resistor) with a resistance value below 50 ω, the built-in buzzer will sound. This function can actually improve the efficiency of measuring line continuity.

When the multimeter is set to the on-off position, the internal circuit that is connected is: the black test lead is connected to the negative electrode of the internal battery, the positive electrode of the battery is connected to a resistor with a small resistance, and the other end of the resistor is connected to the red test lead. The internal buzzer circuit obtains the trigger signal from the resistor. If the two test leads are short-circuited or the resistance between them is small, then the voltage on the trigger resistor in the meter will be higher, triggering the chirping. If the resistance between the two test leads is large, then the partial voltage of the series-connected internal trigger resistor will be very small, and the chirp will not be triggered.

Be sure to turn off the power before measuring resistance or continuity. Do not use the continuity setting of a multimeter to measure the continuity of live equipment! ! Because according to the measurement principle of the on-off gear, it can be imagined that if the test leads are connected to the on-off gear, especially when connected to high voltage, the voltage across the trigger resistor will be very large! Severe ones will burn it out, sometimes burning out the chirping circuit and even damaging the battery.