Mastech MS8269 User Manual

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.
10
 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 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
In order to prevent the meter or the equipment to
be measured 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 position.
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 Humming ON/OFF test
In order to prevent the meter or the equipment to
be measured from being damaged, always turn
off all power supplies for the circuit to be
measured and discharge all high-voltage

Mastech MS8269 Specifications

General

Brand	Mastech
Model	MS8269
Category	Multimeter
Language	English