n Elliptical clamp shape improves access to
earth cables and straps up to 50 mm
n Low maintenance flat jaw interface
n Measures ground resistance from 0.05
to 1500
n Measures true RMS ground leakage current
from 0.5 mA rms to 35 A rms
n CAT IV 600 V safety rating
n Backlit LCD display
DET14C AND DET24C
Digital Earth Clamps
DET14C and DET24C
Digital Earth Clamps
DESCRIPTION
The DET14C and DET24C represent a new generation of
earth/ground clamp-on resistance testers. These instruments
induce a test current into earth systems and measure ground
resistance in multi ground installations without needing to
disconnect the ground. They offer market leading access,
advanced features, simple operation and CAT IV 600 V safety
protection.
Designed with flat core ends they prevent dirt build up,
ensuring measurement integrity and improved reliability
over products with interlocking teeth. Other enhancements
over current generation products include improved accuracy
and up to 300% increase in battery life. In electrically noisy
environments the built-in filter function offers increased
noise immunity.
DET14C and DET24C also offer a true RMS AC current
measurement facility up to 35 Amps. The instrument’s ability
to measure current flowing in an earth cable is a useful safety
feature, especially if the earth cable has to be disconnected.
A high current flow to earth could draw an arc on dis-
connection with potentially severe consequences.
The elliptical shaped head design offers improved access to
cables and earth straps in space constrained locations. The
clamp head accommodates up to 37 mm diameter cable and
50 mm earth tapes making them suitable for use in power
stations, substations, towers and many more facilities.
Operation in dark and restricted areas is facilitated by a
display with backlight and an audible tone associated with
the hold key. Optimised jaw opening mechanism ensures
proper jaw closure without excessive use of force when
opening the jaws.
The DET14C offers storage of results for later on-screen
recall and the DET24C supports a download of results via
IrDA-to-USB link into PowerDB and Power DB Lite, Megger’s
acceptance and maintenance test data management software.
Stored data is indexed using a sequential serial number
together with a time and date stamp for each record.
FEATURES AND BENEFITS
n Auto-current measurement safety feature
n Memory to record and view results
n Automatic self calibration
n Auto ranging
n High and low alarms
n Real time clock for date and time stamping of results
DET24C ADDITIONAL FEATURES
n IrDA USB interface to PC
n Advanced memory functionality with download
n Megger PowerDB/PowerDB LiteTM compatible
APPLICATION
The earth resistance clamp meters are particularly suitable
for measuring earth resistance in various installations such
as buildings, pylons and RF transmitter sites without system
disconnection. In addition, they can be used for the
inspection and verification of lightening protection systems
and virtually any installation where a current loop can be
generated.
DET14C AND DET24C
Digital Earth Clamps
SPECIFICATIONS
Resistance measurements
Ground resistance Resolution Intrinsic
range certainty
0.05 Ω to 0.99 Ω 0.01 Ω ±1.5% ±0.05 Ω
1.00 Ω to 9.99 Ω 0.01 Ω ±1.5% ± 0.1Ω
10.0 Ω to 99.9 Ω 0.1 Ω ±2% ± 0.5 Ω
100.0 Ω to 199.9 Ω 0.1 Ω ±5% ± 1 Ω
200 Ω to 400 Ω 1 Ω ±6% ± 5 Ω
400 Ω to 600 Ω 1 Ω ±10% ± 10 Ω
600 Ω to 1200 Ω 10 Ω ±20%
1200 Ω to 1500 Ω 10 Ω ±35%
n Frequency of measurement 1390 Hz.
Alarm settings
Alarm type Range Resolution
Threshold 1 1 Ω to 1500 Ω 1 Ω
Threshold 2 1 Ω to 1500 Ω 1 Ω
Current measurements (RMS)
Current range Resolution Intrinsic
Certainty
0.5 mA to 0.99 mA 0.01 mA ±2% ±0.05 mA
1.00 mA to 9.99 mA 0.01 mA ±2% ±0.05 mA
10.0 mA to 99.9 mA 0.1 mA ±2% ±0.1 mA
100 mA to 999 mA 1 mA ±2% ±1 mA
1.00 A to 9.99 A 0.01 A ±2% ±0.01 A
10.0 A to 35.0 A 0.1 A ±2% ±0.1 A
n True RMS readings up to a crest factor of 5.0
(peak current 40 A).
n Accuracy guaranteed for 50 Hz and 60 Hz.
n Measurement over the range 16 Hz to 400 Hz.
n Maximum current is 100 A rms continuous and 200 A rms
for 60 s max at 50 Hz and 60 Hz
Maximum jaw opening 39 mm
Maximum jaw inner
dimensions 39 mm x 55 mm
Display type 4 + 6 digit with backlight
Battery type 4 x 1.5 V IEC LR6/AA alkaline
Battery life 24 hours continuous testing –
see Note 1
Auto power down 300 s (reset by jaw action or button
press)
Data logging DET14C 256 records
DET24C 2 k records
Data download Opto-coupled IrDA-USB interface
(DET24C only)
Range selection Automatic within each mode
Sample time < 1 s
Hold function Yes with visual indicator
Alarm function Yes with visual indicator
Warning buzzer Yes
Operating temperature
and humidity -20 °C to +50 °C, <85% RH
Storage temperature
and humidity -40 °C to +60 °C, <75% RH
Weight 985 g
Instrument dimensions 248 mm (l) x 114 mm (w) x
49 mm (h)
IP rating IP30 with jaws closed
Note 1: Whilst measuring a 25 Ω resistance without backlight
Performance
IEC 61557-5
IEC 61557-13 Class 1
Safety
EN 61010-2-032
CATIV 600 V
Pollution degree 2
EMC
Class B Compliant, IEC 61326, BSEN 61326
UK
Archcliffe Road Dover
CT17 9EN England
T +44 (0) 1304 502101
F +44 (0) 1304 207342
UKsales@megger.com
UNITED STATES
4271 Bronze Way
Dallas TX 75237-1019 USA
T 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, Chonburi
THAILAND
CERTIFICATION ISO
Registered to ISO 9001:2008 Cert. no. Q 09250
Registered to ISO 14001-2004 Cert. no. EMS 61597
DET14C_DET24C_DS_EN_V01
www.megger.com
Megger is a registered trademark
ORDERING INFORMATION
Product Order Code
DET14C Digital earth test clamp-on meter 1000-761
DET24C Digital earth test clamp-on meter 1000-762
Included accessories for DET14C and DET24C
Carrying case 1001-715
Carrying strap (wrist loop) 1001-716
User guide CD-ROM 1001-198
Calibration check 1001-498
Battery AA (Alkaline) (4 required) 25511-841
Included accessories for DET24C
USB IrDA dongle 90001-434
PowerDB Lite software 1000-576
DET14C AND DET24C
Digital Earth Clamps
