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12.40V

Voltage(DC)

<HOLD>Hold

Supply voltage: 12.50V

<UP>SHORT TO B+

<F1>Zero

<DOWN>SHORT TO B-

0.00V

Voltage(DC)

<HOLD>Hold

Supply voltage: 12.50V

<UP>SHORT TO B+

<F1>Zero

<DOWN>SHORT TO B-

If the detected voltage is very high and close to the power

supply voltage, the instrument will display a number on the red

background with a sound prompt, indicating that the circuit

voltage is high, which may be a power supply line. If it is an

insulated line, it indicates that the line is leaking to the power

supply, as shown in the following figure:

Probe power supply function on instrument line: Press the [up]

function key, and the probe outputs the power supply voltage;

Probe grounding function on instrument line: Press the [down]

function key, and the probe is short circuited to the negative

pole of the power supply;

Test function of automotive electrical appliances: The instru-

ment outputs a power supply voltage value through the probe

to drive the automobile electrical appliances to work. It judges

whether the electrical appliances are damaged by observing

whether the electrical appliances are working, or drive the

automobile electrical appliance through short connecting the

special probe to the negative pole, and then judge whether the

electrical appliance is damaged by observing whether the

electrical appliance is working. For example, check whether

the turn signal is intact and use the probe to detect the current

voltage value of the two leads of the lamp. If both lines are

●

10K. If the circuit is insulated to ground, it indicates that the

circuit has leakage, as shown in the following figure:

Autool DM303 User Manual

Questions and Answers: