AEMC 3620 2114.90 3-Point Analog Ground Resistance Tester

The AEMC 3620 Analog 3-Point Ground Resistance Tester performs ground resistance measurement from 0.5 to 1000 Ohms with unsurpassed accuracy and speed.

The 3620 features 3 terminal operation for fall of potential earth and ground resistance, and can be used for 2-Point tests as well. The large 3.1 inch logarithmic scale is very easy to read, and has a separate marking for 25 Ohms. A manual zero adjust is provided for accurate readings, and color coded terminals are easy to use with banana plug inputs and binding posts.

3620 Features

Fall of Potential method for 2 and 3-Point ground resistance testing
Direct reading on large analog display 0.5 to 1000 Ohms as well as easy 25 Ohm readings
Large 3.1 inch (77 millimeter) easy to read scale for accuracy
Built in battery check
3 color coded terminals
Large press to measure buttons
Compact and portable
Easy to operate just connect, press, and read
Engineered to reject high levels of interference and noise

Applications

The 3620 is the perfect instrument for power utilities, electrical contractors, telephone and CATV technicians, REAs, and inspectors who need to check ground to determine compliance with OSHA, NEC, and other specifications.

Measuring earth resistance of the type of small ground grids or single rod usually found in remote telecommunication switching sites
Measuring ground electrode resistance of lightning protection equipment
Measuring the earth electrode resistances of equipment located in recreational areas
Testing electrode resistance of grids and ground rods at new construction sites, when utility supplied power has not been supplied
Testing earth electrode resistance of grounded towers at cellular phone remote installations

Specifications
Measurement Range
Range	0.5 to 1000 Watts
Measurement Range	25 Watts
Resolution	10 mW
Test Current	10 mA
Accuracy in % of Reading	5 + 0.1 percent of galvanometer scale length
Auxiliary Electrode Influence	Rz: 3000 times the reading up to 50 kW, Ry: 50 kW
Accuracy Reference Conditions	23 degrees C ±3K, 50 percent RH ±10 percent, battery at 8 Volts ±0.2 Volts, externa; magnetic field <40 A/m, external field <1 V/m, conductor centered, loop resistance noninductive. Accuracy percent of reading
Resistance Measurement Frequency	128 Hertz square wave
Voltage Withstand	250 Volts rms with spikes of 3000 Volts AC or 1000 Volts DC
Power Source	Eight 1.5 Volt AA Alkaline batteries
Battery Life	approximately 1680 fifteen-second tests
Fuse Protection	High breaking capacity 0.1 Amps, 250 Volts, 0.25 x 1.25 inches
Mechanical Specifications
Display	Analog pivot movement
Connection	Color-coded terminals accept spade lugs with minimum gap of 6 millimeters or standard 4 millimeter banana jacks
Scale	3.1 inch (77 millimeter) white scale with black pointer; one scale per range
Operating Temperature	14 to 131 degrees F (-10 to 55 degres C)
Storage Temperature	-40 to 158 degrees F (-40 to 70 degrees C), 0 to 90 percent RH with batteries removed
Temperature Influence	5 percent per 10 degrees C
Relative Humidity	20 to 90 percent maximum
Dimensions	8.7 x 5.4 x 5.9 inches 220 x 136 x 150 millimeters
Weight	2 pounds (1.3 kg)
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
Safety Reference Specifications
Safety Ratings	IEC 1010-1 Cat III Pollution Degree 2, 24 Volts
Agency Approvals	Emission: EN 50081-1; Immunity: EN 50082-1