The Extech DM220 Pocket Autoranging DMM (Digital Multimeter) is a compact and versatile instrument designed for a wide range of electrical measurements. It features a 3-3/4 digit (4000 count) LCD display and offers autoranging capabilities, simplifying its use across different measurement scales.
Function Description:
The DM220 measures AC/DC Voltage, AC/DC Current (with a 200mA/500V resettable fuse), Resistance, Capacitance, Frequency, and Duty Cycle. It also includes Diode Test and Continuity functions. A notable feature is its built-in non-contact AC voltage detector and a flashlight, enhancing its utility in various environments.
Important Technical Specifications:
- DC Voltage:
- Ranges: 400mV, 4V, 40V, 400V, 600V
- Resolution: 0.1mV to 1V
- Accuracy: ±(0.8% reading + 2 digits) for 400mV-400V, ±(1.0% reading + 2 digits) for 600V.
- AC Voltage (50 to 60Hz):
- Ranges: 4V, 40V, 400V, 600V
- Resolution: 1mV to 1V
- Accuracy: ±(1.0% reading + 5 digits) for 4V-40V, ±(1.5% reading + 5 digits) for 400V-600V.
- DC Current:
- Ranges: 400µA, 4000µA, 40mA, 200mA
- Resolution: 0.1µA to 0.1mA
- Accuracy: ±(2.0% reading + 2 digits).
- AC Current (50 to 60Hz):
- Ranges: 400µA, 4000µA, 40mA, 200mA
- Resolution: 0.1µA to 0.1mA
- Accuracy: ±(2.5% reading + 5 digits).
- Resistance:
- Ranges: 400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ
- Resolution: 0.1Ω to 0.01MΩ
- Accuracy: Ranging from ±(0.8% reading + 5 digits) to ±(5.0% reading + 5 digits).
- Capacitance:
- Ranges: 4nF, 40nF, 400nF, 4µF, 40µF, 200µF
- Resolution: 0.001nF to 0.1µF
- Accuracy: Ranging from ±(5.0% reading + 0.6nF) to ±(5.0% reading + 30 digits).
- Frequency:
- Ranges: 9.999Hz to 99.99kHz
- Resolution: 0.001Hz to 0.01kHz
- Accuracy: ±(1.0% reading + 2 digits).
- Duty Cycle:
- Range: 0.5 to 99%
- Resolution: 0.5%
- Accuracy: ±(2.0% reading + 5 digits).
- Diode Test: Test current 1mA, open circuit voltage 1.5V DC typical.
- Continuity Check: Audible sound if resistance is less than 100Ω.
- Non-Contact Volt Detect: 100 to 600VAC; 50/60Hz.
- Input Impedance: >7.5MΩ (VDC & VAC).
- AC Response: Average responding.
- ACV Bandwidth: 50Hz to 60Hz.
- Display: 4000 count 3-3/4 digit liquid crystal.
- Overrange Indication: "OL" is displayed.
- Polarity: Automatic (no indication for positive); Minus (-) sign for negative.
- Auto Power Off: Approximately 15 minutes.
- Low Battery Indication: Icon displayed if battery voltage drops below operating voltage.
- Batteries: Two 1.5 volt AAA.
- Fuses: mA, µA ranges; 0.2A/500V fast acting resettable fuse.
- Operating Temperature: 32°F to 104°F (0°C to 40°C).
- Storage Temperature: 14°F to 122°F (-10°C to 50°C).
- Operating Humidity: Max 80% up to 87°F (31°C) decreasing linearly to 50% at 104°F (40°C).
- Storage Humidity: <80%.
- Operating Altitude: 7000ft. (2000meters) maximum.
- Weight: 0.319lb (145g).
- Size: 4.09" x 2.1" x 1.2" (104 x 55 x 32.5mm).
- Safety: Designed for double insulation per EN61010-1 and IEC61010-1 2nd Edition (2001) to Overvoltage Category IV 600V and Category III 600V; Pollution Degree 2.
Usage Features:
- Intuitive Controls: The device features a function switch for selecting measurement modes, a MODE button for AC/DC selection or specific functions (like Ω, nF, diode, continuity), and a Hz/%Duty Cycle button.
- Non-Contact AC Voltage Detector: This safety feature allows users to detect live AC circuits without direct contact, indicated by an illuminating light. It works in any function switch position, including OFF.
- Flashlight: A built-in flashlight, activated by pressing and holding a dedicated button, provides illumination in dimly lit work areas.
- Auto Power Off: To conserve battery life, the meter automatically turns off after 15 minutes of inactivity.
- Overrange Indication: The display shows "OL" (Overload) when the measured value exceeds the selected range, prompting the user to switch to a higher range.
- Low Battery Indication: A battery icon appears on the display to alert the user when the battery voltage is low, indicating it's time for replacement.
- Resettable Fuse: The 0.2A/500V fast-acting resettable fuse automatically resets once the excessive current is removed from the meter's input, protecting the device from damage due to overcurrent.
Maintenance Features:
- General Care: The manual emphasizes keeping the meter dry, storing it in normal temperatures, handling it gently, and cleaning the case with a damp cloth (avoiding chemicals).
- Battery Replacement: The meter uses two 1.5V AAA batteries. Replacement involves turning off the power, removing a Phillips head screw on the bottom to open the battery cover, inserting new batteries with correct polarity, and securely fastening the cover.
- Battery Storage: For long-term storage, it is recommended to remove the batteries to prevent leakage and potential damage to the unit.
- Safety Precautions: Users are warned to always disconnect test leads from any voltage source before removing the battery cover and to never operate the meter unless the battery cover is securely in place.
- Calibration and Repair Services: FLIR Systems, Inc. offers calibration and repair services for Extech products, including NIST traceable calibration. Annual calibrations are recommended to verify performance and accuracy.
- Warranty: The DM220 comes with a two-year warranty from FLIR Systems, Inc. for defects in parts and workmanship, with a six-month limited warranty for sensors and cables.
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