5.6 Blown-fuse indicator
If the fuse is blown, the symbol " " will appear on the display.
When the current gear is selected, the symbol "FUSE" is displayed simultaneously. Current
measurement is not allowed. Please replace the fuse in time.
5.7 Input jack indicator
When shifting gear, the corresponding input indicator will flash 5 times to prompt you to insert the probe
into the appropriate socket.
5.8 Automatic current identification
When the “A” connector is inserted into the sensor, the meter will automatically shift to the “ ” gear and
enter the current measurement function.
5.9 Automatic shutdown
Once enabled, it will default to auto power off and display " " symbol. Without any key operation for
about 15 minutes, the meter will turn off automatically to save the battery power.
Press and hold the “ ” button to turn on the meter, the auto power off function will be canceled.
6. Measurement operation
● Do not measure voltages higher than 600 V; otherwise the meter may be damaged.
● Pay special attention to safety when measuring high voltage to avoid electric shock or
injury.
● Before use, please check the known voltage with a multimeter to ensure that the
multimeter is in good condition.
6.1 Smart (AUTO) measurement
This measurement mode is used by default when turned on. In this mode, DC voltage, AC voltage,
resistance, continuity can be measured, and the meter can automatically identify the measurement
signal.
1) Press the button to turn on the power, display and enter the smart measurement mode.
2) Insert the red probe into the jack and the black test lead into the "COM" jack.
3) Contact the probes with both ends of the measured power or resistance (in parallel), and the meter
will automatically recognize the measured signal.
4) When measuring resistance, if the resistance is less than about 50 Ω, the buzzer sounds and the
indicator lights up.
5) Read the results from the display.
NOTE: The minimum measured voltage in this mode is 0.8 V.
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Mastering the Art of Measurement (DM401B Smart Digital Multimeter) r.01 www.plusivo.com
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