AEMC 3620 (2114.90) 3-Point Ground Resistance Testers

DISCONTINUED ITEM-Replacement Model: AEMC 3640 (2114.92) 3-Point Ground Resistance Testers

The Analog Ground Resistance Tester Model 3620 performs ground resistance measurement from 0.5 to 1000Ω with speed and accuracy. The Model 3620 features three-terminal operation for fall-of-potential earth/ground resistance, and may also be used for 2-Point tests.

The large 3.1" logarithmic scale is easy to read, with a separate marking for 25Ω. A large Press-to-Measure button allows for easy measurements. A manual zero adjust is provided for accurate readings. Color-coded terminals are easy-to-use banana plug inputs and binding posts.
The Model 3620 is also available in complete kit form. The 3620-Kit-150ft includes meter two 150 ft color-coded leads on spools (red and blue), one 30 ft lead (green), two 14.5" T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measurer and carrying bag.
The 3620-Kit-300ft includes meter, two 300 ft color-coded leads on spools (red and blue), two 100 ft color-coded leads (green and black), four 14.5" T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measurer and carrying bag.

• Fall-of-Potential method for 2- and 3-Point ground resistance tests
• Direct reading on large analog display 0.5 to 1000Ω and easy 25Ω readings
• Large 3.1″ (77mm), easy-to-read scale for accurate readings
• Built-in battery check
• Three color-coded terminals
• Large press-to-measure buttons
• Portable and compact
• Extremely simple to operate: connect – press – read
• Designed to reject high levels of noise and interference

• The Ground Resistance Tester Model 3620 is the ideal instrument for electrical contractors, power utilities, REAs, telephone and CATV technicians, and inspectors who must check ground to determine compliance with NEC, OSHA and other specifications. Applications include:
• Measuring earth resistance of the type of single rod or small ground grids often found in remote telecommunication switching sites
• Measuring ground electrode resistance of lightning protection equipment
• Measuring the earth electrode resistance of equipment in recreational areas
• Testing electrode resistance of ground rods and grids at new construction sites, when utility supplied power has not been supplied
• Testing earth electrode resistance of grounded towers at cellular phone remote installations

• Range : 0.5 to 1000Ω
• Resolution : 10mΩ
• Test Current : 10mA
• Resistance Measurement
• Frequency : 128Hz square wave
• Accuracy : ±5% of Reading + 0.1% of galvanometer scale length
• Auxiliary Electrode Influence : Rz 3000 times the reading up to 50kΩ Ry 50kΩ
• Withstanding Voltage : 250Vrms with spikes of 3000VAC or 1000VDC
• Power Source : Eight 1.5V “AA” Alkaline batteries
• Battery Life : 1680 15-second tests (approximately)
• Fuse Protection : High breaking capacity 0.1A, >250V, 0.25 x 1.25″
• Display : Analog Pivot movement
• Connection : Color-coded terminals accept spade lugs with minimum gap of 6mm or standard 4mm banana jacks
• Scale : 3.1″ (77mm) white scale with black pointer; one scale per range
• Operating Temperature : 14° to 131°F (-10° to 55°C)
• Storage Temperature : -40° to 158°F (-40° to 70°C), 0 to 90% RH with batteries removed
• Temperature Influence : 5% per 10°C
• Relative Humidity : 20 to 90% maximum
• Dimensions : 8.7 x 5.4 x 5.9″ (220 x 136 x 150mm)
• Weight : 2 lbs (1.3kg)
• Case : Heavy-duty, ABS
• Colors : Case safety yellow; Front panel gray
• Mechanical Shock : IEC 68-2-27
• Vibration Test IEC 68-2-6
• Drop Test : IEC 68-2-32
• Environmental : O-ring sealed against dust and water to IP50
• Rating : EN 61010-1, Cat. III, Pollution Degree 2, 24V
• Agency Approval Emission: EN 50081-1 Immunity: EN 50082-1
• Double Insulation : Yes
• CE Mark : Yes

• AEMC 3620 Data Sheet.pdf