Megger DET2/2 Specifications

DET2/2

Auto Earth Tester

DET2/2

Auto Earth Tester

■ High resolution – 1 mΩ – ideal for large

earthing systems

■ High accuracy for earth electrode and soil

resistivity testing

■ Test voltage 50 V max. for safety

■ Rechargeable battery power with long

battery life and rapid re-charge

■ A robust, versatile instrument with IP54

protection

DESCRIPTION

The Megger®DET2/2 Auto Earth Tester is a robust
compact instrument designed for measuring earth
electrode resistance and soil resistivity. It uses the four
terminal method of measurement which eliminates the
resistance of the current circuit from the measurement.
The circuit design ensures that the resistance of the
potential circuit does not affect the measurement
during practical testing.

The instrument is microprocessor controlled and provides
a flexible, ‘user-friendly’ approach to earth testing by
giving good error detection capabilities and full test
information on a large easily readable alpha-numeric
display. A simple key pad can be used to adjust the test
frequency, the test current level and the filtering so that
adverse conditions influencing the test may be overcome.
The display indicates if:-

■ the noise interference in the soil passing the test current

is excessive.

■ the current test spike resistance is too high.

■ the potential test spike resistance is too high.

■ the battery needs recharging.

Because these factors are indicated directly the whole
testing procedure is accomplished easily and more rapidly.

A wide band of test current frequencies, with a resolution
of 0,5 Hz, may be used to eliminate errors caused by noise
in the earth. The chosen test current frequency, test
current level and the increased filtering option are stored
in memory for use in subsequent tests.

■ Filter and high current features to enable

valid earth testing in difficult situations

The display can be set to show its information in the
following languages:- English, French, German,
Portuguese and Spanish.

The maximum output voltage is limited to 50 V for safety
when performing a test and convenience when re­positioning test spikes. The instrument is auto-ranging
relieving the operator of any concern as to which
resistance range to use. The low service error and an IP 54
environmental specification enable accurate results to be
obtained in ‘unfriendly’ testing conditions.

Power for the instrument is supplied from a rechargeable
lead acid battery which gives 5 hours of life per charge,
equivalent to six hundred individual tests lasting 30
seconds each.

The DET2/2 is built into a robust plastic case and has its
four terminals, equipped for spade or 4 mm connectors,
mounted on the front panel.

APPLICATIONS

The DET2/2 Earth Tester is a reliable instrument designed
for larger or more complex earthing systems, including
communications earthing systems and difficult testing
environments. It may be used to test in accordance with
BS 7430 (1991), the IEE Wiring Regulations and VDE 0413
part 7 (1982). The instrument is suitable for soil resistivity
measurements, which are used to establish the optimum
electrode design and site, as well as perform archeological
and geological investigations.

DET2/2

Auto Earth Tester

Resistivity tests assist in the design of a correct earth
system and avoid the cost of re-working electrode
installations.

Earth testing kits, which include suitable test spikes and
test leads, are available separately.

specifications

Earth Resistance Range

0,010 Ω to 19,99 kΩ (auto-ranging),
1 mΩ resolution.

Accuracy (23°C ±2°C)

±0,5% of reading ±2 digits

Service Error

±5% of reading ±2 digits ±10 mΩ (meets
VDE service error over 50 mΩ)

Comply with Standards

BS 7430 (1991)

VDE 0413 Part 7 (1982)

Test Frequency

105 to 160 Hz reversing d.c. (50 Hz operation default to 128 Hz,
60 Hz operation default to 150 Hz) Set in steps of 0,5 Hz

Test Current

50 mA max (selectable high and low levels)

Maximum Output Voltage

< 50 V r.m.s.

Maximum Interference

Typically 40 V peak-to-peak (50/60 Hz, sinusoidal nature)

Display

Alphanumeric L.C.D. (130 x 35 mm) giving test information and a
large (20 mm) 3

Temperature Coefficient

< ±0.1% per °C over the temperature range -10 to +40°C
0,05% per °F from 14 to 104°F

Temperature Range

Operating: -10 to +40°C (14 to 104°F)
Storage: -20 to +60°C (-4 to +140°F)

Humidity

Operating: 90% RH max. at 40°C (104°F)

Environmental Protection

The instrument is waterproof to IP54

Flash Test: 3 kV a.c.

Voltage Withstand

In the event of a system fault, the instrument will withstand
240 V a.c. applied between any two terminals.

Power Supply

Internal

Rechargeable, sealed lead-acid battery.
12 V (nominal), 2,6-Ah capacity.
Battery voltage over which basic accuracy is maintained is 11,0 to
13,5 V.

Battery life: Approximately 5 hrs. continuous use.

1⁄2-digit reading)

Battery charging time: 6 hrs. max. (from completely
exhausted), charging current automatically controlled to stop
over-charging.

Charging supply required: 100 to 130 V or 200 to 260 V,
50/60 Hz.

Power consumption: 9 W max. at 12 V.

Safety

The instruments meet the requirements of IEC61010-1.

EMC

In accordance with IEC 61326 -1.

Dimensions: 245 H x 344 W x 158 D mm

(9,6 H x 13,5 W x 6,25 D in. approx.)

Weight: 5 kg (11 lb approx.)

Maximum Current Spike (Loop) Resistance

High Low
Range Current Current

(RE ) (RC ) (RC )
0,010 to 0,499 Ω 5 kΩ 1 kΩ
0,500 to 1,999 Ω 5 kΩ 3 kΩ
2,000 to 19,99 Ω 10 kΩ 5 kΩ
(over 20 Ω RC > 20 kΩ)

Maximum Potential Spike (Loop) Resistance

High Low
Range Current Current

(RE ) (RP ) (RP )
0,010 to 0,499 Ω 11 kΩ 11 kΩ
0,500 to 1,999 Ω 21 kΩ 11 kΩ
2,000 to 19,99 Ω 21 kΩ 11 kΩ
(over 20 Ω RP > 20 kΩ)

ORDERING INFORMATION

Item (Qty) OrderCode.

Auto Earth Tester DET2/2

Included Accessories

Mains supply lead for battery charging
Operating instruction book 6171-728

Optional Accessories

Earth testing kit 6310-755
Comprising carrying case and pouch containing:
Four galvanised steel spikes (‘L’ shape) 10 mm dia. (0.4 in. dia.
approx) x 350 mm (14 in. approx) long
30 m (98,5 ft approx) of cable on a winder
50 m (164 ft approx) of cable on a winder
Two 3 m leads complete with connectors and clips
Hammer
Reel of cable, 50 m [164 ft. approx] 6121-119

UK

Archcliffe Road Dover
CT17 9EN England
T [phone]
F [phone]

UNITED STATES

4271 Bronze Way
Dallas TX 75237-1088 USA
T 800 723 2861 (USA only)
T [phone]
F [phone]

OTHER TECHNICAL SALES OFFICES

Norristown USA, Toronto CANADA,
Mumbai INDIA, Trappes FRANCE,
Sydney AUSTRALIA, Madrid SPAIN
and the Kingdom of BAHRAIN.

Registered to ISO 9001:2000 Reg no. Q 09290

Registered to ISO 14001 Reg no. EMS 61597

DET2_2_DS_en_V12

www.megger.com
Megger is a registered trademark