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5.6 Frequency Measurement
The method of measuring frequency is:
1.Turn rotary switch
Hz%
to position.
2.Press
Hz%
key and select
Hz
range.
3.Apply the two ends of test leads to measure the
frequency value of the circuit under test.
4.Read frequency value from LCD.
5.7 Duty Cycle Measurement
The method of measuring duty cucle is:
1.Turn rotary switch to
Hz%
position.
2. Press
Hz%
key and select
%
range.
3.Apply the two ends of test leads to measure the duty
cycle value of the circuit under test.
4.Read frequency value from LCD.
5.8 Current Measurement
To avoid the meter or measured equipment from
being damaged, firstly check the fuse of the meter
before measuring current.When measuring ,
please use correct input socket, function shift and
measuring range.
Don't try to measure current when the open circuit
voltage exceeds 250V.
Warning
The DC current range: 400uA, 4.000mA, 40.00mA,
400.0mA .The AC current range: 400uA, 4.000mA,
40.00mA, 400.0mA
The method of measuring resistance is:
1.Cut off the power of measured circuit. Discharge all
high voltage capacitance on measured circuit.
2.Turn rotary switch to mA or uA position.When the
measured current is less than 400uA, select uA
position.When the measured current is 4mA~400mA,
select mA position.
3.Disconnect the circuit under test. Connect black test
lead to the end of disconnected circuit under test
(with lower voltage), connect red test lead to the other
end of disconnected circuit under test ( with higher
voltage).
4.Switch on the power of the circuit, and then read out
displayed reading.If the display only displays “OL”, it
will show that the input exceeds selected range, and
the rotary switch shall be placed at higher range.
5.Cut off the power of measured circuit. Discharge all
capacitances, take off the test leads and recover the
circuit
Notice:
1.The measuring current of the meter shall be connected
in series,not connected in parallel to avoid from
damaging the meter or endangering personal safety.
2.When measuring DC current, if the test leads are
reversely connected to the circuit , the display will
change into negative,but not affect measuring accuracy.
