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DM220 bảng dữ liệu(PDF) 4 Page - Extech Instruments Corporation.

tên linh kiện DM220
Giải thích chi tiết về linh kiện  Pocket Autoranging DMM
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nhà sản xuất  EXTECH [Extech Instruments Corporation.]
Trang chủ  http://www.extech.com
Logo EXTECH - Extech Instruments Corporation.

DM220 bảng dữ liệu(HTML) 4 Page - Extech Instruments Corporation.

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DM220 V3.0 01/06
4
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on circuits or
wires that have voltage on them.
1. Set the function switch to the Ω CAP
position.
2. Press the MODE button to indicate
on the display.
3. Touch the test probe tips to the circuit or wire you wish to check.
4. If the resistance is less than approximately 100
Ω, the audible signal will sound.
If the circuit is open, the display will indicate “OL”.
DIODE TEST
1. Set the function switch to the Ω CAP
position.
2. Press the MODE button to indicate
on the display.
3. Touch the test probes to the diode under test. Forward voltage will typically
indicate 0.400 to 0.700V. Reverse voltage will indicate “OL”. Shorted devices
will indicate near 0V and an open device will indicate “OL” in both polarities.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test
and discharge all capacitors before taking any capacitance measurements.
Remove the batteries and unplug the line cords.
1. Set the rotary function switch to the Ω CAP
position.
2. Press the MODE button to indicate nF on the display.
3. Touch the test leads to the capacitor to be tested.
4. Read the capacitance value in the display
FREQUENCY MEASUREMENTS
1.
Set the rotary function switch to the V/Hz/% position.
2.
Press the Hz /% button to indicate Hz on the display.
3.
Touch the test probe tips to the circuit under test.
4.
Read the frequency on the display.
% DUTY CYCLE
1.
Set the rotary function switch to the V/Hz/% position.
2.
Press the Hz/% button to select % on the display.
3.
Touch the test probe tips to the circuit under test.
4.
Read the % duty cycle on the display.
NON-CONTACT AC VOLTAGE DETECTOR
WARNING: Risk of electrocution. Before use, always test the Voltage Detector on a
known live circuit to verify proper operation.
1.
The Voltage Detector works in any function switch position, including OFF.
2.
Place the detector probe tip next to the hot conductor or insert into the hot side
of the electrical outlet.
3.
If AC voltage is present, the detector light will illuminate.
NOTE: The conductors in electrical cord sets are often twisted. For best results,
rub the probe tip along a length of the cord to assure placing the tip in
close proximity to the live conductor.
NOTE: The detector is designed with high sensitivity. Static electricity or other
sources of energy may randomly trip the sensor. This is normal
operation.


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