User Manual

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2.7 Circuit Breaker
The tool is short-circuit protected. Its internal circuit breaker will trip if it becomes
overloaded. The circuit breaker is a valuable test tool as well as a safety measure to
protect the tool from Overload. When circuit breaker tripped, the LCD will display as
below. All other functions of the tool are still active, which means you can
still probe a circuit and observe the voltage reading. When the circuit breaker is
tripped, the tool will NOT be able to conduct battery current to the tip even when the
power switch is pressed. Intentionally tripping the breaker and using the tool to probe
can be considered an added precaution against accidental pressing of the power
Switch.
2.8 Work mode
There are four modes to diagnose the electrical systems, which can be accessed by
depressing the Mode Button and cycling through each one.
DC voltage
While the tool in this mode, contact the probe tip to a circuit, then the LCD display will read
the DC voltage with a resolution of 0.1 volt.
AC voltage
While the tool in this mode, contact the probe tip to a circuit, then the LCD display will read
the Max. voltage, the Min. voltage, frequency and duty cycle.