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ERICO
ERITECH® EST401
Clamp-on Ground
Resistance Tester
& Clamp-on AC RMS Ammeter

Fast and simple clamp-on operation with no
leads, auxiliary rods or critical spacing.


Overview
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.
Features
- 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.
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Auto-Ranging Resistance |
Range |
Resolution |
Accuracy
(% of reading) |
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) |
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0.300 to 2.999A |
0.001A |
±(2.5% ± 2 µA) |
|
3.00 to 29.99A |
0.01A |
±(2.5% ± 20 µA) |
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Resistance measurement
frequency |
2403 Hz |
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Current measurement
frequency |
47 to 800 Hz |
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Current overload display |
OL |
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Power source |
9V alkaline |
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Battery life |
1000
measurements of 30 seconds |
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Operating functions |
Ohms
range, AC rms range, hold function, self-test,
auto-off, battery life indicator, noise indicator,
open jaw indicator, multi-tone beeper. |
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Included accessories |
Carrying case, battery,
user's manual. |
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