Mastech MS8238B User Manual page 6

3.3.5 Resistance measurement
• Turn off power to the circuit. Allow all capacitors to
discharge.
• Set the rotary switch to the appropriate resistance range.
• Connect the red test lead to the input jack and the black
lead to the COM jack.
• Connect the leads to the circuit under test and read the
measurement on the display.
Tips for measuring resistance:
• In-circuit resistance is usually different from a resistors
rating due to the fact that the meter's test current flows
in parallel with the circuit.
• For increased accuracy when measuring low
resistances, short the test leads, record the value
displayed, then connect the leads to the circuit and
subtract the shorted value from the circuit measurement.
• When the leads are disconnected from the circuit under
test, "OL" will be displayed on the screen.
Warning
To prevent injury or damage to the meter,turn
off power to circuit and discharge all capacitiors
fully before making resistance measurements.
3.3.6 Continuity measurement
• Turn off power to the circuit. Allow all capacitors to
discharge.
• Set the rotary switch to the continuity position.
• Connect the red test lead to the input jack and the black
lead to the COM jack.
• Connect the leads to the circuit under test.If the
measured resistance is less than 50Ω, the buzzer
will sound.
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Warning
To prevent injury or damage to the meter,turn
off power to circuit and discharge all capacitiors
fully before making resistance measurements.
3.3.7 Diode test
Turn off power to the circuit. Allow all capacitors to
discharge.
• Set the rotary switch to the diode position.
• Connect the red test lead to the input jack and the black
lead to the COM jack.
• Connect the red test lead to the anode (+) and the black
lead to the cathode (-) of the diode and read the
measurement on the display.The meter will display "OL"
if the connection is reversed.
Warning
To prevent injury or damage to the meter,turn
off power to circuit and discharge all capacitiors
fully before making resistance measurements.
3.3.8 Battery test
• Set the rotary switch to the appropriate battery test range.
• Connect the red test lead to the input jack and the black
lead to the COM jack.
• Connect the red test lead to the positive (+) end and the
black lead to the negative (-) end of the battery and read
the measurement on the display.
Warning
To prevent injury or damage to the meter,do not
connent the meter to a battery with a voltage rating
exceeding 60V AC or 30V DC
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