The Digital Ground Resistance Tester Model 4630 performs ground resistance and soil resistivity tests. This direct reading testers measures from 0 to 2000W, and is auto-ranging, so it automatically seeks outs the optimum measurement range. The Model 4630 is rugged, easy-to-use and is ideal for maintenance crews performing numerous tests. It exceeds mechanical and safety specifications for shock, vibration and drop tests called out in IEC standards. It is designed to reject high levels of interference, so it can be used under difficult conditions such as high stray currents that normally affect accuracy. The Model 4630 is powered by 9.6V, 3.5 Ah NiMH rechargeable batteries. A built-in recharge circuit, powered from 120/230V 50/60Hz line, also provides for testing while recharging.

Features
• Measures soil resistivity (4-Point) method
• Measures ground resistance (2- and 3-Point) Fall-of-Potential method
• Step voltage tests and touch potential measurements
• Auto-Ranging: automatically selects the optimum range
• Designed to reject high levels of noise interference
• Extremely simple to operate: connect - press - read
• LED on faceplate informs operator of high input noise, high auxiliary rodresistance and fault connections
• AC powered with rechargeable NiMH batteries
• Rugged, dustproof and rainproof field case
• Can also be used for continuity tests on bonding
• Color-coded terminals

Electrical
Range	20Ω	200Ω	2000Ω
Measurement Range	0.00 to 19.99Ω	20.0 to 199.9Ω	200 to 1999Ω
Resolution	10mΩ	100mΩ	1Ω
Open Voltage	< 42V peak	< 42V peak	< 42V peak
Resistance Measurement Frequency	128Hz square wave	128Hz square wave	128Hz square wave
Test Current	10mA	1mA	0.1mA
Accuracy	+ 2% of Reading + 1ct	+ 2% of Reading + 1ct	+ 2% of Reading + 3cts
Auxiliary Electrode Influence Max Res. in Current Circuit Max Res. in Voltage Circuit	3kΩ 2000Ω	30kΩ 50kΩ	50kΩ 50kΩ
Response Time	Approximately 4 to 8 seconds for a stabilized measurement
Withstanding Voltage	250V AC or 1000V DC
Power Source	120/230V 50/60Hz Rechargeable 9.6V, 3.5 Ah NiMH batteries
Battery Life	1800 15-second measurements; LO BAT indication on LCD
Fuse Protection	0.1A, 250V, 0.25 x 1.25"; 30kA Interrupt Capacity