Atec Biddle-DET-2-2 - Manual

DET2/2
Auto Earth Tester
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.
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 re-
positioning 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.
■ 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
■ Filter and high current features to enable
valid earth testing in difficult situations
DET2/2
Auto Earth Tester