2 DM220-en-US_V3.3 10/20
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.
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.
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:
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.
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