AEMC 4620 4-Point Digital Ground Resistance Tester, 2000 Ohms Resistance, 10mA Current

The AEMC 4620 digital ground resistance tester performs 4-point soil resistivity, 2- and 3-point ground resistance, step voltage, touch potential, and continuity tests in rugged conditions, such as field maintenance crews performing numerous tests. The direct reading tester measures from 0 to 2000Ω, with auto-ranging that automatically determines the optimum resistance range and test current. It is designed for ease of use, with “connect–press–read” operation, a large easy-to-read LCD screen, user alerts, and color-coded terminals that match color-coded leads and probes. Ground-resistance meters are used by electricians and contractors working in industrial, utility, and field servicing.
The AEMC 4620 tester is engineered to reject high levels of noise and interference for use under difficult conditions, such as high stray currents that normally affect accuracy. It exceeds IEC mechanical and safety specifications for shock, vibration, and drop tests. Safety ratings include EN 61010-1, 150V CAT III, 300V CAT III, and pollution degree 2. The double-insulated product is UL approved and CE marked.
Specifications

Measurement range
Autoranging 0.00 to 19.99Ω/20.0 to 199.9Ω/200 to 1999Ω

Test current
10mA/1mA/0.1mA

Resistance measuring frequency
128Hz square wave

Accuracy (% of reading)
+ or – 2% reading + or – 1ct/ + or – 5% of reading + or – 3cts

Operating temperature range
-10 to 55 degrees C/14 to 131 degrees F

Response time
~ 6 seconds for stabilized measurement

Power source
(8) 1.5V C cell batteries (included)

Weight
7.75lbs./3.5kg

Dimensions
240 x 185 x 110mm/9.45 x 7.28 x 4.33″ (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.