Mastech MS2109A User Manual

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4. Operating Guidance
1) In the process of measurement, if reading hold is
required, press “HOLD/B.L” key. The display value
in the display will be locked. Press “HOLD/B.L”
key again to release reading hold.
4.1 Reading Hold
4.2 NCV Key
NCV key is used for non-contact voltage detection.
Press this key and hold it. Place the NCV sensor
zone close the conductor to be detected. It voltage
is more than AC 90V, NCV indicator will flash and
the buzzer will sound at regular intervals.
4.3 Frequency/Duty Ratio Switch
1) When the meter is in AC voltage, AC current position,
if “Hz/%” button is pressed, the meter will measure
AC voltage and AC current signal frequency. Click
“Hz/%” button again, and the meter will measure
voltage and current signal duty ratio. If it is in
HZ/DUTY position, pressing HZ % key will switch
between HZ and DUTY.
4.4 Maximum/Minimum Measurement Choice
1) Press “MAX/MIN” key to enter MAX mode, and
always store measurement maximum value. Press
“MAX/MIN” key again, and the meter will enter
minimum value measurement state. Press
“MAX/MIN” key for the third time, and the meter
will display the difference of maximum and minimum
value. Press “MAX/MIN” key to cycle through the
above operations.
2) After entering MAX or MIN mode, the meter will
automatically save the measured maximum or
minimum value.
3) If the user presses “MAX/MIN” key more than 2 sec,
the meter will restore normal measuring range.
1) When the meter is in the maximum/minimum value
measurement state, it is manual measuring range
mode.
2) When the meter is in the frequency, duty ratio
measurement state, it can't be switched to
maximum/minimum value measurement mode.
3) When the meter is in the maximum/minimum value
measurement state, SEL, REL key is invalid.
Note:
3.2.11 Temperature
Measuring
range
Resolution
Accuracy
-20°C~0°C
±(3.0% of reading + +4 digits)
1°C~400°C
401°C~1000°C
1°C
±(1.0% of reading + +3 digits)
±2.0% of reading
Note:
When the meter is in the maximum/minimum value
measurement state, it can't be switched to frequency,
duty ratio measurement mode.
2) If “Hz/%” button is pressed again, the meter will
revert to voltage, current measurement state.
- Temperature indicator does not include thermocouple error.
- Overload protection: 250V DC or AC (RMS)

Mastech MS2109A Specifications

General

Brand	Mastech
Model	MS2109A
Category	Measuring Instruments
Language	English