Mastech MS2109A User Manual

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3) Through grade HZ/DUTY:
Electric shock hazard.
Pay special attention to avoid shock when
measuring high voltage.
Don't input voltage more than AC 250V RMS.
(1) Insert black probe to COM jack, insert red probe to
INPUT jack.
(2) Place transfer switch in position HZ.
(3) Connect the probe with signal or both ends of load
in parallel.
(4) Read on the LCD.
(5) Press “Hz/%” again to enter duty ratio measuring
state.
Warning
Note:
Frequency measurement range is 1 Hz~10 MHz. If the
frequency to be measured is less than 1 Hz, the LCD
will display “00.0”.
4.13 Resistance Test
Electric shock hazard.
When measuring circuit impedance, determine
that the power supply is disconnected and the
capacitor in the circuit is completely discharged.
Warning
1) Insert black probe to COM jack, insert red probe to
INPUT jack.
2) Place measuring range switch to position. At
time, the meter is in the measurement state.
3) Connect the probe to the both ends of resistor or
circuit to be tested..
4) LCD will show readings.
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Ω
Note:
1) When the input end is open, LCD shows “0L”
over-range state.
2) When the resistance to be tested is >1MΩ, the meter
reading will stabliize after a few seconds, which is
normal for high resistance readings.
4.14 Diode Test
1) Insert black probe to COM jack, insert red probe to
INPUT jack.
2) Place measuring switch in position.
3) Press “SEL” button to switch to measuring state.
4) Connect the red probe to diode anode and connect
the black probe to diode cathode to make test.
5) Readings will display on the LCD.
Ω
Note:
1) What the meter shows is approximation of diode
forward voltage drop.
2) If the probe has reverse connection or the probe
is open, the LCD will show “0L”.
4.15 Circuit Continuity Test
Electric shock hazard.
When measuring circuit continuity, determine
that the power supply is disconnected and the
capacitor in the circuit is completely discharged.
Warning
1) Insert black probe to COM jack, insert red probe to
INPUT jack.
2) Measuring switch is placed to position.
3) Press “SEL” key to switch to circuit continuity
measuring state.
Ω

Mastech MS2109A Specifications

General

Brand	Mastech
Model	MS2109A
Category	Measuring Instruments
Language	English