Frequency/Duty Ratio Measurement; Temperature Measurement; General Specifications - Mastech MS8239C User Manual

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The meter will display the diode's forward bias
voltage value. If the test probe polarity is reversed,
the meter will display "OL", which distinguishes
the diode's cathode and anode.
Warning
When measuring diodes, to avoid injury or meter
damage, turn off the power to the circuit and
discharge all capacitors.

Frequency/Duty Ratio Measurement

1 Rotate function selection switch to frequency/duty
ratio measurement position.
2 Press "FUNC" key to select frequency or duty ratio
measurement function.
3 Connect black and red test probe to COM input
jack and VΩmA input jack, respectively.
4
Measure the circuit with the other ends of test probes.
5 Read the measured result from LCD display.
Warning
Don't input the voltage higher than 60V DC or 30V
AC in frequency/duty ratio measurement position,
to prevent electric shock or meter damage.
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Temperature Measurement

1
Rotate function selection switch to temperature
(select Celsius degree or Fahrenheit degree as
required) measurement position.
2 Connect negative and positive end of K-type
thermocouple to COM input jack and VΩmA
input jack.
3 Place K-type thermocouple to the object or
environment to be measured.
4 Read the measured result from LCD display.
Warning
Don't input the voltage higher than 30V in
temperature measurement position, to prevent
electric shock or meter damage.

General Specifications

• Operating environment and condition: 600V CAT. III,
pollution grade: II.
• Elevation < 2000 m
• Environment temperature and humidity: 0~40°C,
<80% RH (do not use meter when temperature <10°C).
• Storage temperature and humidity: -10~60°C,
<70% RH (remove the battery).
• Temperature coefficient: 0.1xAccuracy/°C
(<18°C or >28°C).
• The maximum allowable voltage between
measurement end and ground: 600V DC or 600V
AC RMS.
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