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The ranges for DC voltage of this meter are: 200.0mV, 2.000V,
The ranges for AC voltage are:2.000V, 20.00V, 200.0V, and 750V.
Attention:
With the measuring ranges of DC 200mV and AC 2V, the meter will
display a certain value even though the measuring tips are not
connected. In this case, short out the "V-Ω" AND "COM" ends for a
second to make the displayed value of the meter to zero.
3.2.2 Measuring resistance
WARNING
To prevent the meter or the equipment to be tested from being
damaged, always turn off all power supplies of the circuit to
be tested and discharge all high-voltage capacitors before
measuring resistance .
Resistance is a measure of the impedance related with current.
The unit of resistance is Ohm (Ω).
The ranges for resistance of the meter are: 200.0Ω, 2.000kΩ,
20.00kΩ, 200.0kΩ, 2.000MΩ, and 20.00MΩ.
To measure resistance:
1. Set the rotary switch at the proper position.
2. Connect the black measuring tip and the red measuring tip to
the input socket of COM and the input socket of VΩ, respectively.
3. Measure the resistance of the circuit to be tested with the other
ends of the measuring tips.
4. Read the measured value of resistance from LCD.
The following are some tips for measuring resistance:
The measured resistance of a resistor connected to a circuit usually
differs to a certain degree from the rated resistance.
This is because the test current given by the meter flows through all
possible pathways across the two test tips.
When measuring values of low resistance, in order to get an accurate
value, please first short out the two meter tips and read the value of
resistance when the meter tips are short out, which should be
deducted from the measured resistance for the resistor to be tested.
When the switch of the meter is at the position of resistance, the
output voltage can turn on a Si diode or transistor by reaching the
value of positive turning-on voltage. In order to prevent this situation
20.00V, 200.0V, and 1000V;
09
from occurring, do not use the range of 40MΩ when conducting
measurements on a resistor connected to a circuit .
When the range is set at 20MΩ it takes several seconds to get
a stable reading, which is normal for measuring values of high
resistance.
If there is no input(e.g. in the case of an open circuit), the
display outputs" 1 ", which means that the measured value
exceeds the range.
3.2.3 Diode Measurement
WARNING
In order to prevent the meter or the equipment to be measu-
ring from being damaged, always turn off all power supplies
for the circuit to be measured and discharge all high voltage
capacitors before conducting measurements for a diode.
Conducting measurements for a diode disconnected from a circuit:
1. Set the rotary switch at
2. Connect the black measuring tip and the red measuring tip to
the COM input socket and the Ω input socket, respectively.
3. Connect the black measuring tip and the red measuring tip to
the cathode and the anode of the diode to be measured,
respectively.
4. The positive partial voltage of the diode to be measured will
be displayed by the meter. If the measuring tips are connected
to the wrong poles, " 1 " will be displayed by the meter.
When the diode is connected to a circuit, the positive voltage of
a good diode should be 0.5V to 0.8V; however, the readings of
reversed partial voltage varies, because it depends on the
resistance of other pathways between the two measuring tips.
3.2.4 Continuity Measurement
WARNING
In order to prevent the meter or the equipment to be measu-
red from being damaged ,always turn off all power supplies
for the circuit to be measured and discharge all high-
voltage capacitors before conducting the Humming ON/OFF
test.
position.
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