Extech Instruments DM220, Руководство пользователя

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DM220 V3.0 01/06 3
Operating Instructions
WARNING : Risk of electrocution. High-voltage circuits, both AC and DC, are very
dangerous and should be measured with great care.
1. ALWAYS turn the function switch to the OFF position when the meter is not in
use.
2. If “ OL ” appears in the display during a measurement, the value exceeds the
range you have selected. Change to a higher range.
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.
AC/DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure AC/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/Hz/% position.
2. Press the MODE button to indicate “ AC ” or “ DC ” on the display.
3. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
4. Read the voltage in the display.
AC/DC CURRENT MEASUREMENTS
1. For current measurements up to 4000µA AC/DC, set the function switch to the
µA position
2. For current measurements up to 200mA AC/DC, set the function switch to the
mA position.
3. Press the MODE button to indicate “ AC ” or “ DC ” on the display.
4. Remove power from the circuit under test, then open up the circuit at the point
where you wish to measure current.
5. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
6. Apply power to the circuit.
7. Read the current in the display.
RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test
and discharge all capacitors before taking any resistance measurements.
Remove the batteries and unplug the line cords.
1. Set the function switch to the Ω CAP position.
2. Press the MODE button to indicate
Ω
on the display.
3. Touch the test probe tips across the circuit or part under test. It is best to
disconnect one side of the part under test so the rest of the circuit will not
interfere with the resistance reading.
4. Read the resistance in the display.
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