Extech Extech DM220 Manual

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User's Guide

Pocket Autoranging DMM

Model DM220

AutoRanging DMM

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Vr

CAT III - 1000 V
CATIV-600V

82xxx

CA V

Introduction

Congratulations on your purchase of the Extech DM220 Pocket Autoranging
Multimeter. This meter measures AC/DC Voltage, AC/DC Current with
200mA/500V resettable fuse, Resistance, Capacitance, Frequency, Duty Cycle,
Diode Test, and Continuity. It features a built-in non-contact AC voltage detector
plus flashlight. Proper use and care of this meter will provide many years of reliable
service.

Safety

This symbol adjacent to another symbol, terminal or
operating device indicates that the operator must refer to an
explanation in the Operating Instructions to avoid personal
injury or damage to the meter.

WARNING

This meter has been designed for safe use, but must be operated with caution.
The rules listed below must be carefully followed for safe operation.

1. NEVER apply voltage or current to the meter that exceeds the specified

maximum:

V DC or V AC 600V DC/AC
µA AC/DC 200mA 500V fast acting resettable fuse
Resistance, Diode Test,
Continuity Test

2. USE EXTREME CAUTION when working with voltages greater than 25VAC

or 35VDC. These voltages are considered a shock hazard.

3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds

600V above earth ground.

4. NEVER connect the meter leads across a voltage source while the function

switch is in the current, resistance, or diode mode. Doing so can damage the
meter.

5. ALWAYS discharge filter capacitors in power supplies and disconnect the

power when making resistance, continuity or diode tests.

6. ALWAYS turn off the power and disconnect the test leads from the circuit

before opening the cover to replace the batteries.

7. NEVER operate the meter unless the battery cover is in place and fastened

securely.

This WARNING symbol indicates a potentially hazardous
situation, which if not avoided, could result in death or
serious injury.

This symbol indicates that a device is protected throughout
by double insulation or reinforced insulation.

Function Maximum Input

Input Protection Limits

600V DC/AC

Description

1. Non-contact ACV detector probe tip

2. Non-contact ACV indicator light

3. 3-3/4 digit (4000 count) LCD

4. Mode switch

5. Flashlight button

6. Function switch

7. Battery cover

8. Test Leads

9. Hz/%Duty Cycle button

10. Flashlight

1

10

2

3

4

5

9

8

6

7

DM220 V3.0 01/06 2

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.

DM220 V3.0 01/06 3