The AEMC models 4620 and 4630 digital ground resistance testers perform both ground resistance and soil resistivity tests. These
testers measure from 0 to 2000 Ω and are auto-ranging, so they automatically seek out the optimum measurement range. It's also very easy-to-use.
Simply connect the leads, press-to-measure and read the results.
The large, 3/4" LCDs are easy-to-read and also indicate low battery status, overrange, test lead shorts and
lead reversals. Three LED indicators on the front panel continuously warn the user of measurement problems to ensure accurate and
reliable tests.
The AEMC models 4620 and 4630 are fuse protected up to > 250 V AC against accidental connection to live circuits. In the event
of a system fault, they can withstand 150 V AC with spikes of up to 3000 V AC or 1000 V DC. The heavy-duty field case is sealed
against dust and water when closed. The meter itself is self-contained within an inner case providing additional environmental and
insulation protection. The test button is also sealed against the elements.
The AEMC model 4620 is powered by eight alkaline C cell batteries. The model 4630 is powered by a 9.6 V, 3.5 Ah NiMH rechargeable battery
pack. A built-in recharge circuit, powered from 120/230 V 50/60 Hz line, also provides for testing while recharging. Both
models will perform over 2000 tests between recharging (Model 4630) or battery replacement (Model 4620).
The AEMC models 4620 and 4630 are rugged, easy-to-use instruments ideal for maintenance crews performing numerous tests. Both
models exceed mechanical and safety specifications for shock, vibration and drop tests called out in IEC standards. They are
designed to reject high levels of interference, so they can be used under difficult conditions such as high stray currents
that normally affect accuracy.
The AEMC Model 4620 Digital Ground Resistance Tester ships complete with:
- (8) C cell batteries
- User manual
The AEMC Model 4630 Digital Ground Resistance Tester ships complete with:
- Battery
- AC power cord
- User manual
The AEMC Models 4620 & 4630 are also available as test kits, offered in three different packages.
150 ft. 3-Point Test Kit
- (2) 150 ft. color-coded leads on spools(red/blue)
- (1) 30 ft. lead (green)
- (2) T-shaped aux. ground electrodes
- (5) spaded lugs
- (1) 100 ft. tape measure
- Carrying bag
300 ft. 4-Point Test Kit
- (2) 300 ft. color-coded leads on spools(red/blue)
- (2) 100 ft. color-coded leads (green/black)
- (4) T-shaped aux. ground electrodes
- (5) spaded lugs
- (1) 100 ft. tape measure
- Carrying bag
500 ft. 4-Point Test Kit
- Model 6470-B meter and accessories listed above
- (2) 500 ft. color-coded leads on spools(red/blue)
- (2) 100 ft. color-coded leads (green/black)
- (1) 30 ft. lead (green)
- (4) T-shaped aux. ground electrodes
- (5) spaded lugs
- (1) 100 ft. tape measure
- Carrying bag
| AEMC Models 4620 & 4630 Digital Ground Resistance Testers Specifications |
| Ranges (Auto-Ranging 0 to 2000 Ω) |
20 Ω |
200 Ω |
2000 Ω |
| Measurement |
0.00 to 19.99 Ω |
20.0 to 199.9 Ω |
200 to 1999 Ω |
| Resolution |
10 mΩ |
100 mΩ |
1 Ω |
| Open voltage |
≤ 42 V peak |
≤ 42 V peak |
≤ 42 V peak |
| Resistance measurement frequency |
128 Hz square wave |
128 Hz square wave |
128 Hz square wave |
| Test current |
10 mA |
1 mA |
0.1 mA |
| Accuracy |
±2% of reading ± 1 ct |
±2% of reading ± 1 ct |
±2% of reading ± 3 cts |
Max. Res. in current circuit
Max. Res. in voltage circuit |
3 kΩ
50 kΩ |
30 kΩ
50 kΩ |
50 kΩ
50 kΩ |
| Interference |
Rejects high levels of interference voltage (DC, 50 to 60 Hz, harmonics):DC voltage in series with
Y: 13 V peak; AC voltage in series with Z: 32 V peak |
| Response time |
Approximately 4 to 8 seconds for a stabilized measurement |
| Withstanding voltge |
250 V AC or 100 V DC |
| Power Source |
Eight C cell batteries; Alkaline recommended |
120/230 V 50/60 Hz. Rechargeable 9.6 V, 3.5 Ah NiMH battery pack |
| Battery life |
1800 15-second measurements; LO BAT indication on LCD |
| Fuse protection |
0.1 A, > 250 V, 0.25 x 1.25"; 30 kA interrupt capacity |
| Display |
3.5 digit, 0.71" (18 mm) high; 2000-counts; electroluminescent blue backlight LCD also indicates
overrange, test lead shorts and lead reversals |
| LED indication |
Three LEDs indicate high input noise, high auxiliary rod resistance, open leads, blown fuse |
