Extech EX520A High Accuracy True RMS Multimeter

The Extech EX520A is a high accuracy True RMS digital multimeter designed for the toughest professional electrical environments. With 0.09% basic DCV accuracy and a 6000-count backlit LCD, it delivers the measurement precision required for critical aircraft electrical system diagnostics, avionics calibration, and demanding MRO applications. Its CAT IV-600V safety rating, the highest commercial multimeter safety classification, and IP67-rated waterproof, dustproof housing with 2-meter drop protection make it one of the most ruggedized digital multimeters available for field and hangar use. A LoZ (low impedance) function and low-pass filter add further capability for ghost voltage elimination and accurate measurements on VFD and inverter circuits.

Key Features

• 0.09% basic DCV accuracy, precision-grade for critical measurement applications in aviation maintenance and calibration work
• True RMS for accurate readings on non-sinusoidal waveforms, including aircraft inverters, variable frequency systems, and switching power supplies
• CAT IV-600V safety rating for safe use at the service entrance and on primary electrical distribution systems
• IP67-rated housing, fully dustproof and waterproof, rated to 1 meter depth for 30 minutes
• 2-meter drop proof for durability in field maintenance environments
• LoZ (low impedance) input to eliminate ghost voltage readings on de-energized circuits
• Low-pass filter for accurate measurements on VFD and inverter outputs
• 6000-count backlit LCD with MIN/MAX, data hold, and relative mode
• Up to 20A AC/DC current measurement with double-molded test leads

Specifications

• DC Voltage: up to 600V
• AC Voltage: up to 600V (True RMS)
• DC/AC Current: up to 20A
• Display: 6000-count backlit LCD
• Basic DCV Accuracy: ±0.09%
• True RMS: Yes
• LoZ Function: Yes
• Low-Pass Filter: Yes
• Safety Rating: CAT IV-600V
• IP Rating: IP67 (dustproof and waterproof)
• Drop Proof: 2m (6.5 ft)
• Power: 9V Battery

Applications

The EX520A is the precision tool of choice for avionics technicians and MRO electricians performing calibration-sensitive voltage measurements, aircraft battery testing, power quality analysis on aircraft electrical buses, and ground support equipment electrical diagnostics in environments exposed to moisture, dust, and mechanical shock. Its CAT IV-600V rating and IP67 housing make it one of the few digital multimeters rated for safe use from primary service entrances through to aircraft component-level testing, and the 0.09% DCV accuracy ensures measurement traceability for maintenance documentation and compliance requirements.

Need Your Extech EX520A Calibrated?

• PJi operates an ISO/IEC 17025 Accredited Calibration Lab and provides NIST-traceable calibration for the Extech EX520A at purchase.
• Documentation satisfies FAA Part 145, ISO 9001, and AS9100 requirements.
• PJi is the one-stop source: instrument and certificate in one transaction.

Why Buy from Pilot John International?

• Pilot John International is an authorized Extech distributor with an in-house ISO/IEC 17025 Accredited Calibration Lab.
• One-stop source for Extech instruments and NIST-traceable calibration in a single transaction.
• We serve aviation maintenance, FAA Part 145 repair stations, and industrial MRO facilities.
• Full-catalog availability and same-business-day shipping on in-stock items.