Major tech MT22 Manuel d'instruction - Page 10
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NOTE: On some low AC and DC voltage ranges, with the test leads not
connected to a device, the display may show a random, changing reading.
This is normal and is caused by the high-input sensitivity. The reading will
stabilize and give a proper measurement when connected to a circuit.
6.1. MODE BUTTON
To select Diode/Continuity or DC/AC voltage, current, temperature (°C/°F)
6.2. RANGE BUTTON
When the meter is first turned on, it automatically goes into Auto ranging.
This automatically selects the best range for the measurements being
made and is generally the best mode for most measurements. For
measurement situations requiring that a range be manually selected,
perform the following:
1. Press the RANGE button. The "AUTO" display indicator will turn off.
2. Press the RANGE button to step through the available ranges until
you select the range you want.
3. Press and hold the RANGE button for 2 seconds to exit the Manual
Ranging mode and return to Auto Ranging.
6.3. DATA HOLD BUTTON
The Data Hold function allows the meter to "freeze" a measurement for
later reference.
1. Press the DATA HOLD button to "freeze" the reading on the indicator.
The indicator "HOLD" will be appear in the display.
2. Press the DATA HOLD button to return to normal operation.
6.4. MAX HOLD BUTTON
The max. Hold position is used to measure the maximum value. The
maximum measured value is up dated continuously. Press the button once
again to release the hold and allow a further measurement.
6.5. DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on the circuit is
being switched ON or OFF. Large voltage surges may occur
that can damage the meter.
1.
Set the function switch to the V DC position ("mV" will appear in the
display).
2.
Insert the black test lead banana plug into the negative (COM) jack
and the red test lead banana plug into the positive (V) jack.
3.
Touch the test probe tips to the circuit under test. Be sure to observe
the correct polarity (red lead to positive, black lead to negative).
4.
Read the voltage in the display. The display will indicate the proper
decimal point and value. If the polarity is reversed, the display will
show (-) minus before the value.
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