Mastech MS8239C User Manual

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Keys Operation
“FUNC” key:
Function selection key, switch measurement function
by pressing “FUNC” key, combined with switch
“HOLD” key:
Data hold key, press “HOLD” key; the reading will be
locked and “HOLD” symbol will display on LCD
display. Press “HOLD” key again to revert to normal
measurement state.
“Hz/%” key:
Frequency/duty ratio selection key. At frequency
position, pressing this key can select frequency or
duty ratio measurement, AC/DC voltage or AC/DC
current position. Pressing this key can select
voltage/frequency/duty ratio or current/frequency
/duty ratio measurement mode.
“ ”key:
Backlight switch key. Press “ ”key and hold for
2sec., turn on backlight; press this key when the
backlight is on to turn off the backlight.
Measuring Operation
AC/DC Voltage Measurement:
Rotate function selection switch to voltage
measurement position.
Press “FUNC” key to select AC or DC voltage
Connect black and red test probe to COM input
jack and VΩmA input jack, respectively.
Measure the voltage of circuit to be tested with
other ends of test probes (connected with the
circuit to be tested in parallel)
Read the measured value from LCD display. When
measuring DC voltage, the display will
simultaneously show the voltage polarity which is
connected with red test probe.
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Automatic Power-Off Function
In the measurement process, if there is no activity
by the function key or function selection switch for
30 minutes, the meter will automatically shutdown
(sleep state). Hold “FUNC” key to power on and the
automatic shutdown function will be cancelled.
Don't measure any RMS voltage higher than 600V
DC or AC, to prevent injury or damage to meter
and equipment.
Warning
AC/DC Current Measurement:
Turn off the power to the circuit to be tested.
Discharge all high voltage capacitors on the circuit
to be tested.
Rotate function selection switch to appropriate
current position.
Press “FUNC” key to select AC or DC current.
Depending on the size of the current to be measured,
connect the red test probe to 10A or VΩmA input
jack and connect the black test probe to COM input jack.
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Mastech MS8239C Specifications

General

Brand	Mastech
Model	MS8239C
Category	Multimeter
Language	English