Ground Resistance Tester
Model 3620 & 3620 Kits
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.
Features
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 button
Portable and compact
Extremely simple to operate: connect - press - read
Designed to reject high levels of noise and interference
Double Insulation
CE Mark
Applications
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
Specifications
ELECTRICAL
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"