DET14C and DET24C
Clamp-on Ground Resistance Testers
DET14C and DET24C
Clamp-on Ground Resistance Testers
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Large elliptical clamp design
Smooth mating surfaces on the
clamp head
CATIV 600 V operation
Noise filter function
Intelligent data hold function
Data storage with time- and
date-stamped results
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DESCRIPTION
The DET14C and DET24C are advanced clamp-on ground
resistance testers that set new standards in terms of
access, performance, features, simplicity of operation and
safety. The DET14C and 24C are used to measure earth/
ground resistance in multiple loop installations without
disconnecting the ground.
Designed with flat core ends, these units prevent dirt
build-up, ensuring measurement integrity and improved
reliability over products with interlocking teeth. Other
enhancements include safety to CATIV 600V, a built-in
filter function for electrically noisy environments, time and
date stamped stored test results and ultra long battery life.
Megger has taken what is now a standard test method and
significantly improved its field applicability.
The DET14C and DET24C are designed to quickly measure
ground electrode resistance in applications where this type
of test method can be used and/or verify the integrity of
ground connections. The goal of ground resistance testing
is to ensure that the resistance ground electrode system is
low enough to prevent or limit voltage rises caused by fault
current, electrical surges, lightning strikes, etc.
Clamp-on ground testers work in applications where
there is a loop resistance to measure with ground paths
in the system (the more ground paths, the closer to the
actual resistance). A utility pole ground system is a classic
example of this type of application.
Typical end users include:
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Power utilities
Electrical contractors/electricians
Specialist grounding contractors
Electrical testing companies
Telecommunications companies
Railroads
Mining companies
The DET14C is being used to test a pole ground.
DET14C and DET24C
Clamp-on Ground Resistance Testers
Intelligent data hold function (preset before testing)
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Increases instrument ease of use in difficult testing
locations
Backlit display
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Allows for operation in low light environments such as
cable basements
Data storage (both models)/results downloading
(DET24C)
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Reduces potential for error in recording results
Time and date stamped results
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Improved data/results management
Improved accuracy of result reporting
New ergonomic trigger design
The DET14C is shown measuring a ground spike in a ground well.
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Easier and more comfortable to operate
Less chance of slippage causing the head to snap shut
APPLICATIONS
Typical testing applications include:
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Ultra long battery life (24 hours continuous) with
readily available batteries
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Pole grounds
Service entrance/meter ground electrodes
Service panels
Pad mount transformer grounds
Transmission tower grounds - utlility ground cables
Telephone pedestals
Telephone cabinets
Lightning protection ground electrodes
Longer operating time
Reduced cost of ownership
ELECTRICAL SPECIFICATIONS
Resistance Measurements
Ground Resistance Range
0.05
Ω
to 0.99
Ω
1.00
Ω
to 9.99
Ω
10.0
Ω
to 99.9
Ω
100.0
Ω
to 199.9
Ω
200
Ω
to 400
Ω
400
Ω
to 600
Ω
600
Ω
to 1200
Ω
1200
Ω
to 1500
Ω
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FEATURES AND BENEFITS
Large elliptical clamp (head) design
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Allows testing of round cables/rods up to 37 mm
diameter and ground tapes/straps up to 50 mm width
Improved testing access
Resolution
0.01
Ω
0.01
Ω
0.1
Ω
0.1
Ω
1
Ω
1
Ω
10
Ω
10
Ω
Accuracy
± 1.5% ± 0.05
Ω
± 1.5% ± 0.1
Ω
± 2% ± 0.5
Ω
± 5% ± 1
Ω
± 6% ± 5
Ω
± 10% ± 10
Ω
± 20%
± 35%
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Frequency of measurement 1390 Hz.
Range
1 - 1500
Ω
0 - 1500
Ω
Resolution
1
Ω
1
Ω
Smooth mating surfaces on the clamp head
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Alarm Settings
Alarm Type
Threshold 1
Threshold 2
Easy to clean
No interlocking teeth to damage
CATIV 600 V operation
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Highest level of user safety available
Unit can be used safely before the distribution board
Current Measurement (RMS)
Current Range
0.5 mA to 0.99 mA
1.00 mA to 9.99 mA
10.0 mA to 99.9 mA
100 mA to 999 mA
1.00 A to 9.99 A
10.0 A to 35.0 A
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Resolution
0.01 mA
0.01 mA
0.1 mA
1 mA
0.01 A
0.1 A
Accuracy
± 2% ± 0.05 mA
± 2% ± 0.05 mA
± 2% ± 0.1 mA
± 2% ± 1 mA
± 2% ± 0.01 A
± 2% ± 0.1 A
Noise filter function
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User can select the filter function to increase noise
immunity
Allows the unit to be used in higher electrical noise
environments
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Resistance and current limit alarm functions (visual
and audible)
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Minimum and maximum limits can be set to reduce test
time/improve accuracy
True RMS readings up to a crest factor of 5.0 (peak current 40 A)
Accuracy guaranteed for 50 Hz and 60 Hz
Measurement over the range 16 Hx to 400 Hz
Maximum current is 100 A RMS continuous and 200 A RMS for
60 s max at 50 Hx and 60 Hz
DET14C and DET24C
Clamp-on Ground Resistance Testers
GENERAL SPECIFICATIONS
Maximum jaw opening
Maximum jaw inner dimensions
Display type
Battery type
Battery life
39 mm
39 mm x 55 mm
4 + 6 digit with backlight
4 x 1.5 V IEC LR6/AA alkaline
24 hours continuous testing –
while measuring a 25
Ω
resistance without backlight
Auto power down button
300 s (reset by jaw action or
button press)
Data logging
DET14C 256 records
DET24C 2,000 records
Data download
Opto-coupled IrDA-USB
interface (DET24C only)
Range selection
Automatic within each mode
Sample time
<1s
Hold function
Yes with visual indicator
Alarm function
Yes with visual indicator
Noise filter function
Yes, automatic
Warning buzzer
Yes
Operating temperature, humidity -4 °F to +122 °F, <85% RH
(-20 °C to +50 °C)
Storage temperature, humidity
-40°F to +140 °F, <75% RH
(-40 °C to +60 °C)
Weight
2.17 lb (985 g)
Instrument dimensions LxWxH
9.7 in. x 4.4 in. x 2 in.
(248 mm x 114 mm x 49 mm)
IP rating
IP30 with jaws closed
Performance
IEC 61557-5
IEC 61557-13 Class 1
Safety
EN 61010-2-032
CATIV 600V Pollution degree 2
EMC
Class B Compliant, IEC 61326,
BSEN 61326
The clamp head of the DET14C/24C has a smooth mating surface and no
interlocking teeth. Its large elliptical design improves access to the test
specimen.
Close up of instrument’s front panel.
DET14C/24C DISPLAY VIEW
DET14C and DET24C
Clamp-on Ground Resistance Testers
DET24C INSTRUMENT FRONT VIEW
Jaw Assembly
CATIV, 600 V Rating
Selector Switch
Ergonomic Trigger
Wrist strap
Intelligent HOLD Button
(preset before testing)
LCD Panel
Test Result Storage and Management
Keys with Easy-to-Use Arrow Buttons
Both units come with a
carrying case, carrying
strap, batteries,
calibration check, and
user guide CD.
DET24C also includes
USB IrDA dongle and
PowerDB Lite software.
ORDERING INFORMATION
Item (Qty)
DET14C Digital earth test clamp-on meter
DET24C Digital earth test clamp-on meter
Included accessories
Carrying case
Carrying strap (wrist loop)
User guide CD-ROM
Calibration check
Battery AA (Alkaline) (4 required)
Included accessories for DET24C only
USB IrDA dongle
PowerDB Lite software
90001-434
1000-576
1001-715
1001-716
1001-198
1001-498
25511-841
Cat. No.
1000-761
1000-762
UK
Archcliffe Road, Dover
CT17 9EN England
T +44 (0) 1 304 502101
F +44 (0) 1 304 207342
UKsales@megger.com
UNITED STATES
4271 Bronze Way
Dallas, TX 75237-1019 USA
T 1 800 723 2861 (USA only)
T +1 214 333 3201
F +1 214 331 7399
USsales@megger.com
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, College Station
USA, Sydney AUSTRALIA, Täby
SWEDEN, Ontario CANADA, Trappes
FRANCE, Oberursel GERMANY, Aargau
SWITZERLAND, Kingdom of BAHRAIN,
Mumbai INDIA, Johannesburg SOUTH
AFRICA, and Chonburi THAILAND
ISO STATEMENT
Registered to ISO 9001:1994 Reg no. Q 09250
Registered to ISO 14001 Reg no. EMS 61597
DET14C_24C_DS_US_V01
www.megger.com
Megger is a registered trademark
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