GDM-541/533 User Manual
36
6.
When measuring AC current, short press the
button to display the frequency/duty
ratio of the measured current.
Caution
To prevent possible electric shock, fire, or
personal injury, switch off the power supply
of the circuit, and then connect the meter with
the circuit in series before measuring the
current.
If the range of the measured current is
unknown, select the maximum range and then
accordingly reduce.
There are fuses inside mA/μA and A input
terminals. Do not connect the test leads with
any circuit in parallel.
When the measured current is >5A, each
measurement time should be ≤10s and the rest
inte rval should be ≥15 minutes.
When the temperature in th
e meter is ≥75°C
after measurement of large current, the yellow
indicator light will be on, the buzzer will
beep, and the LCD will display “CUT”. When
the temperature drops to <40°C, the yellow
indicator light will be off, and the
measurement can be made.
