The AEMC 6471 multi-function digital ground resistance tester with two AC current probes performs 2-clamp testing (no auxiliary rods), 2- and 4-wire bond resistance testing, 3- and 4-point ground resistance testing, ground coupling, selective ground resistance, and soil resistivity testing in rugged conditions, such as field maintenance with numerous tests. The tester is designed for ease of use with “connect–press–read” operation, a large easy-to-read LCD screen, and user alerts. For higher accuracy in electrically noisy environments, the tester can be operated in manual or automatic frequency scan mode from 41 to 513Hz. Test voltage of 16V or 32V can be selected up to 250 milliAmp (mA) test current. The tester automatically recognizes all electrode connections and their resistance value. The auto power-off feature turns off the tester after a set period for power management. Ground-resistance meters are used by electricians and contractors working in industrial, utility, and field servicing.The tester’s software (included) is compatible with Microsoft Windows XP, Windows Vista, Windows 7, and Windows 8. It enables remote set-up and operation of all measurements, and provides data storage, real-time display, analysis, report generation, and system configuration. Up to 512 complete test results can be stored in memory for recording data in the field and then analyzing readings when convenient. After taking measurements, reports are automatically generated. The AEMC 6471 exceeds IEC mechanical and safety specifications for shock, vibration, and drop tests. The double-insulated tester is compliant with grounding standards IEC 61557 parts 4 and 5. Safety ratings are EN 61010-1, CAT IV 50V, pollution degree 2. When closed, the carrying case has an IP 54 rating that protects the instrument from dust and water. The tester comes with two AC current probes (clamps), rechargeable NiMN 9.6V battery pack, and DataView software. Specifications 2-clamp measurement range 0.10 to 500Ω 2-clamp measurement frequency Auto: 1367Hz, manual: 128Hz-1367Hz-1611Hz-1758Hz 3-point electrical measurement range Autoranging 0.09 to 99.9kΩ Resistance measuring frequency 41 to 513Hz selectable or automatic Test current, test voltage Up to 250mA, nominal 16 or 32V RMS selectable 4-point soil resistivity range Autoranging 0.01 to 99.9kΩ External voltage measurement range (autoranging) 0.1 to 65.0V AC/DC – DC to 440Hz Bond testing measurement range (autoranging) 2-pole 0.02 to 99.99kΩ, 4-pole 0.02 to 99.99kΩ Operating temperature range 0 to 45 degrees C/32 to 113 degrees F Power source 9.6V NiMH rechargeable battery pack (included) Weight 7lbs./3.2kg Dimensions 272 x 248 x 130mm/10.7 x 9.76 x 5.12 inches (H x W x D)H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back. Ground-resistance meters test the condition of a grounding system, and provide resistivity measurements in ohms. The meters are available in digital, analog, and clamp models. Grounding systems protect people and equipment, and provide a safe path for the dissipation of fault currents, lightning strikes, static discharges, EMI and RFI signals, and interference. Regular testing of a grounding system is important for safety and protection of equipment. For example, corrosive soil with high moisture content can degrade ground rods and connections in existing systems and increase the resistance of the system. Ground-resistance meters are used in conjunction with a variety of testing methods to troubleshoot intermittent electrical problems or as part of a regular maintenance plan. AEMC Instruments manufactures electrical testing and measurement instruments, including clamp meters, power quality analyzers, ground resistance testers, and data loggers. The company, founded in 1893, is headquartered in Foxborough, MA. What’s in the Box?AEMC 6471 Multi-function ground resistance tester (2) AEMC SR182 AC current probes (clamps) AEMC 2960.21 Rechargeable NiMH 9.6V battery pack DataView software