The ERITECH® EST401 is a hand-held, clamp-on Ground Resistance Tester which measures ground rod and small grid resistance in any season without the use of auxiliary ground rods. The clamp-on ground resistance tester from ERICO® can be used in multi-grounded systems without disconnecting the ground under test. By performing measurements on intact ground systems, the user can measure the resistance to ground and verify the quality of the grounding connections and bonds. Resistance and continuity of grounding loops around pads and buildings may also be measured with the tester.

The ERITECH EST401 includes a current measurement function. The probe’s high sensitivity enables measurement of current leakage flowing to ground or circulating in ground loops down to 1mA and neutral currents to 30Arms. This feature provides additional information that is becoming vital as distribution ground networks carry higher levels of noise and harmonics, which affect power quality.

The ERITECH EST401 has a rugged Lexan® body for durability. A double-walled Lexan shell (or equivalent polycarbonate) encases the probe heads for extra strength. Overall construction and mechanical design ratings such as drop test, weatherproofing against water projections, shock and vibration meet or exceed IEC (International Electrotechnical Commission) standards. The product has been designed to meet IEC 1010.

Battery life information is given at power-up and Auto-Off for power management. Additional features such as resistance and current measurement are displayed on the large LCD.

The ERITECH EST401 is ideal for measuring ground current and ground resistance at pole ground rods, service entrances, pad-mounted transformers, transmission towers, service panels, phone pedestals and central office locations. Extended distances between installations such as high-tension towers will not adversely affect the measurement results.

• Fast and simple clamp-on operation.
• Requires no leads, auxiliary rods or spacing requirements.
• Provides a direct ground resistance reading of 0.1 to 1200 Ohms.
• Gives direct continuity and ground loop resistance readings.
• Offers direct ground leakage or phase current readings from 1 mA to 30A rms.
• Accommodates 1000 MCM cables (1.25 in / 32 mm window) with its expansive jaw design.
• Power management with Auto-Off.
• Durable head and body construction for breakage resistance.
• Designed to EN 61010-1, Cat III safety standard.
• Includes carrying case, user’s manual, battery and calibration loop.

Resistance measurement
(auto-ranging)

0.1 to 1.0 Ω

0.01 Ω

±(2% ± 0.02 Ω)

1.0 to 50.0  Ω

0.1 Ω

±(1.5% ± 0.02 Ω)

50.0 to 100  Ω

0.5 Ω

±(2% ± 0.05 Ω)

100 to 200  Ω

1 Ω

±(3% ± 1 Ω)

200 to 400  Ω

5 Ω

±(6% ± 5 Ω)

400 to 600  Ω

10 Ω

±(10% ± 10 Ω)

600 to 1200  Ω

50 Ω

Not rated

Current measurement
(auto-ranging)

1 to 299 mA

1 mA

±(2.5% ± 2 µA)

0.300 to 2.999A

0.001A

±(2.5% ± 2 µA)

3.00 to 29.99A

0.01A

±(2.5% ± 20 µA)

Resistance measurement frequency

2403 Hz

Current measurement frequency

47 to 800 Hz

Current overload display

OL

Power source

9V alkaline

Battery life

1000 measurements of 30 seconds

Operating functions

Ohms range, AC rms range, hold function, self-test, auto-off, battery life indicator, noise indicator, open jaw indicator, multi-tone beeper.

Included accessories

Carrying case, battery, user's manual.