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Megger DET5/4D
Four Terminal Ground Tester
Discontinued - Replaced By Megger DET4TC
Click image to enlarge
Megger DET5/4D |
 Data
Sheet
User
Guide
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Features:
- Simple, fully automatic operation
- Battery Powered : 6 x 1,5 V (AA) IEC LR6 cells giving 600 typical 15 s tests at 20°C (68°F).
- Choice of three or four terminal
measurement
- Autoranging from 10 mΩ to 20 kΩ
- Tests to BS7671, BS7430, BS6651 and
VDE 0413
- High tolerance to spike resistance helps
testing in urban areas
- Noise rejection to 40 V
Applications:
The DET5/4D and DET5/4R digital earth testers
are reliable instruments able to measure the earth resistance
of both simple and complex electrode systems. They may be used
to test in accordance with BS7430 (1991), BS6651 (1992) BS7671
(the 16th Edition of the IEE wiring regulations), NFC15-100, IEC364
and VDE 0413 part 7 (1982). The instruments are suitable for soil
resistivity measurements which are used to establish the optimum
earth electrode system design and location, to avoid expensive
reworking of electrical installations. They are also suitable
for performing archeological and geological investigations.
The direct indication of excessive noise and
high spike resistances avoids measurement errors and lengthy testing
of these parameters. The direct digital reading is unambiguous,
avoids errors and assists in faster, more economic testing. Earth
testing kits including test spikes and leads, and abook describing
several testing techniques are also available.
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Description
The Megger® DET5/4D and DET5/4R
are fully automatic, four terminal instruments built into a rugged,
water resistant case giving protection for outdoor use. The
instrument is suitable for the testing of earth electrodes and
measuring earth resistivity.
Operation is started by pushing one of two buttons on the front
panel; one for three terminal measurement and one for four terminal
testing. All other functions of the instrument are completely
automatic. The instrument checks for conditions that may cause
an invalid reading during a test. The low service error and wide
operating temperature range enable accurate results to be achieved
in real on-site conditions.
There are four ranges covering measurements from 10 mΩ to
20 kΩ. The earth resistance reading is displayed quickly,
accurately and directly on a large, clear 31/2 digit liquid crystal
display. The display indicates when there is a high test spike
resistance and also when the noise interference is too high to
take a valid reading. If the batteries need replacing or recharging
this will also be shown on the display.
Six 1,5 V AA dry cells provide power for the DET5/4D allowing
600 typical 15 second tests. The DET5/4R is powered by an internal
rechargeable, lead acid battery. This instrument has a built in
battery charger that can operate from a wide range of mains voltages.
The capacity of the lead acid battery enables 600 typical 15 s
tests to be made from one charge.
Each instrument is built into a small, lightweight case with
a handle that has been designed for outdoor use and has IP54 protection.
Four large terminals allow either spade or hook connectors, 4
mm plugs or bare ended wire to be used for the test leads. Terminal
Shorting bars are provided for continuity testing or measurement
using the ‘dead earth’ method. A removable cover allows
access to the battery compartment in the DET5/4D or to the charger
socket in the DET5/4R.
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Models, Options, & Accessories
| Model |
Description |
List Price |
Sale Price |
| DET5/4D |
4-Terminal Digital Ground Tester; Battery - Discontinued - replaced by Megger DET4TC |
| DET5/4R |
4-Terminal Digital Ground Tester; Battery - Discontinued - replaced by Megger DET4TCR2 |
| Model |
Accessories |
List Price |
Sale Price |
| 250581 |
Deluxe Ground Testing Kit |
| $455.00 |  |
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| 250579 |
Standard Ground Testing Kit |
| $455.00 | |
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| 250586 |
Soil Resistivity Kit |
| $585.00 | |
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| EV6310-755 |
Super-Deluxe Ground Testing Kit |
| $530.00 | |
|
| EV6420-103 |
Hard Case for the DET62D, DET5/4D and DET5/4R - Discontinued - no replacement |
| 250855 |
Padded Instrument & Accessory Case for 250202, DET5/4R, DET5/4D & DET62D |
| $200.00 | |
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| 250576 |
Set of Three Color-Coded Test Leads for 250202, DET5/4R, DET5/4D & DET62D |
| $175.00 | |
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| 250584 |
Pair of 11" Ground Rods |
| $62.00 | |
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| 250580 |
Pair of 20" Ground Rods |
| $73.00 | |
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| 250582 |
Pair of 30" Heavy-Duty Ground Rods |
| $109.00 | |
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Specifications
| Earth Resistance Ranges (Autoranging) |
| 20 Ω Range |
0,01 Ω to 19,99 Ω |
| 200 Ω Range |
0,1 Ω to 199,9Ω |
| 2 kΩ Range |
0,001 kΩ to 1,999 kΩ |
| 20 kΩ Range |
0,01 kΩ to 19,99 kΩ |
| Accuracy (at 23°C) |
±7.5% ±3 digits (±10% at >0.5 ohms and ±0.05
ohm at <0.5 ohms forKEMA K85B requirements. |
| Maximum service error |
±7.5% ±3 digits (±10% at >0.5 ohms and ±0.05
ohm at <0.5 ohms forKEMA K85B requirements. |
| Display |
31⁄2 digit L.C.D. with Ω, kΩ
and low battery voltage indicators. LEDs for high noise, high voltage
probe resistance and high current loop resistance. |
| Test Frequency |
128 Hz ±0,5 Hz |
| Test voltage |
Maximum 50 V peak |
| Test Current (constant current
within a range) |
20 Ω Range:10 mA a.c. r.m.s.
200 Ω Range:1 mA a.c. r.m.s.
2 kΩ, 20 kΩ Range:100 µA a.c. r.m.s. |
| Potential Circuit Interference |
Voltages of 40 V pk to pk at 50 Hz, 60 Hz,
200 Hz or 162⁄3 Hz in the potential circuit will have a maximum
effect of typically 1% on the reading in the 20 Ω to 2 kΩ
ranges. If the ‘NOISE’ LED is not showing, the maximum error due
to noise on these ranges will not exceed 2%. In the 20 kΩ
range this is reduced to 32 V pk to pk. |
| Current Loop Interference |
Voltages of 60 V pk to pk, 50 Hz, 60 Hz,
200 Hz or 162⁄3 Hz in the current loop will have a maximum
effect of 1% on the reading with minimal current loop resistance. |
| Maximum Current Loop Resistance |
An additional error of typically 1% may be
introduced for current loop resistances of
20Ω Range: 4 kΩ
200Ω Range: 40 kΩ
2 kΩ, 20 kΩ Range: 400 kΩ |
| Note: with minimal
current loop interference. If the ‘Rc’ LED is not showing the maximum
error will not exceed 2%. |
| Maximum Voltage Probe Resistance |
An additional error of typically 1% will
be introduced for voltage probe resistance of 75 k½. If the ‘Rp’
LED is not showing the maximum error will not exceed 2%. |
| Power Supply |
| DET5/4D |
6 x 1,5 V (AA) IEC LR6 cells giving 600 typical
15s tests at 20°C (68°F). |
| DET5/4R |
Rechargeable version (12 V, 0,8 Ah) from
110/120 V or 220/240 V (user selectable) 50/60 Hz supplies giving
600 typical 15 s. |
| Instrument Protection |
IP54 |
| Safety |
The instruments meet the requirements of
IEC1010-1. |
| EMC |
In accordance with IEC61326 including amendment
No. 1. |
| Flash Test |
Tested to 2,3 kV r.m.s. |
| Voltage Withstand |
250 V a.c. between any two terminals. |
| Dimensions |
243 mm x 161 mm x 70 mm
(9,4 in x 6 in x 2,75 in approx.) |
| Weight |
DET5/4D-0,82 kg (1,5 lb approx.)
DET5/4R-1,27 kg (2,8 lb approx.) |
| Temperature Range |
Operating--20°C to +45°C (-4 to113°F)
Storage--40°C to +70°C (-40 to 158°F) (DET5/4D, without batteries) |
| Temperature Coefficient |
±0,1% per °C over the temperature range -15°C
to +45°C
±0,05% per °F over 5°F to 113°F |
| Humidity |
| Operating |
90% RH max. at 45°C (113°F) |
| Storage |
70% RH max. at 55°C (113°F) |
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