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arth/Ground Resistance & Leakage Current Clamp Testers
E
DET10C, DET20C
Earth/Ground Resistance & Leakage
Current Clamp Testers
n
Easy, fast clamp-on operation – No rods
or cables necessary
n
Measures ground resistance from 0.025Ω
to 1550Ω
n
Measures ground leakage current from
0.2mA to 35A
n
Auto ranging with high and low alarms
n
Automatic self calibration
n
Extensive data storage and USB data
download for later analysis (DET20C)
DET10C DET20C
DESCRIPTION
The Megger models DET10C and 20C measure
earth/ground resistance and current flow using clamp-on
technology. The instruments induce a test current into the
system without the need to disturb existing connections.
Either unit is a useful addition to the more traditional
methods of earth/ground resistance testing that may
require disconnection and the use of stakes or ground
rods. Simply clamp around the conductor or stake/rod
and measure the resistance to ground fast and accurately.
The DET10C and 20C can also be used to measur
earth/ground resistance in multiple loop installations
without disconnecting the earth or ground. This allows
the user to perform the test quickly and easily in total
safety, with the added convenience of having a single
point of measurement to read the earth/ground resistance.
Each instrument also provides a true RMS current
measurement reading to better indicate potential
measurement problems and provide a useful overview of
the dynamics of the general earth/gr
ound system.
e
The units are rugged, compact and have configurable
audible alarms. They also feature auto shutdown (which
is also configurable), data storage and self calibration on
power-up, and are supplied with a calibration loop – all
contained in a rugged carry case. The DET20C also comes
with a USB interface cable and is compatible with Megger
Download Manager Software (included) allowing further
analysis and storage of data.
APPLICATION
The DET10C and 20C have a variety of applications
including:
n
Use to measur
loops ar
n
Use on multi-grounded systems without disconnecting
the gr
n
Use to measure leakage current flowing to ground or
circulating in gr
n
Use on cell towers, RF transmitters and
telecommunications sites.
n
Use to inspect and verify lightning protection systems.
n
Use on a variety of consumer installations, including
pools, spas, etc.
n
Measure shield leakage current to ground for shield
continuity checks
ound pads and buildings.
ound rod/stake under test.
esistance and continuity of gr
e r
ound systems.
ounding
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EATURES AND BENEFITS
F
n
Easy and fast clamp-on operation. No need for cables
or auxiliary rods/stakes.
n
Large LCD display screen that can be read in bright
unlight.
s
n
easures ground resistance from 0.025Ω to 1550Ω.
M
n
Direct reading of continuity and ground loop resistance.
n
Measures ground leakage or phase current from
0.2mA to 35A.
n
arge jaw opening to accommodate a variety of
L
onductors.
c
n
Indication of high noise content that may affect
readings.
n
Lightweight...only 750g (1.65lbs), yet exceptionally
rugged for regular field use.
n
Hold function for difficult to reach installations.
n
Auto-off to save on battery power.
n
Configure high and low alarms with audible indication
for fast field checks.
n
On board storage of test results (up to 8180 records).
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Calibration check loop to insure proper operation.
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Rugged, yet lightweight storage case contains complete
testing kit.
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USB interface for download of test data for later analysis
(DET20C).
DET10C DET20C
arth/Ground Resistance & Leakage Current Clamp Testers
E
LECTRICAL SPECIFICATIONS
E
Ground Resistance Resolution Accuracy
Range
2
0.025 - 0.25 Ω 0.002 Ω ± 1.5% ± 0.05 Ω
0.25 - 9.999 Ω 0.02 Ω ± 1.5% ± 0.1 Ω
10 - 99.99 Ω 0.04 Ω ± 2.0% ± 0.3 Ω
100 - 199.9 Ω 0.4 Ω ± 3.0% ± 1.0 Ω
200 - 400 Ω 2 Ω ± 5.0% ± 5
400 - 600 Ω 5 Ω ± 10% ± 10 Ω
600 - 1550 Ω 20 Ω ± 20%
1
Loop resistance non-inductive, external field <50 A/m,
external electrical field <1 V/m, conductor centred in jaws.
2
Resistance measurement frequency 1.667KHz
Alarm Type Range Resolution
High Alarm 0 - 1550 Ω 1 Ω
Low Alarm 0 - 1550 Ω 1 Ω
Leakage Current Resolution Accuracy
3
Range
0.200 – 1.000 mA 0.001 mA ± 2.0% ± 0.05 mA
1.00 – 10.00 mA 0.01 mA ± 2.0% ± 0.03 mA
10.0 – 100.0 mA 0.1 mA ± 2.0% ± 0.3 mA
100 – 1000 mA 1 mA ± 2.0% ± 3 mA
0.20 – 35 A 0.01 A ± 2.0% ± 0.03 A
3
Auto range, 50/60Hz, true RMS to crest factor <3.5
1
The DET20C instrument is shown being used to test a pole ground.
GENERAL SPECIFICATION
Conductor size ..................................35mm Ø approx
Battery type ......................................9V IEC 6 LR61 alkaline
Display type ......................................4 digits 9999 counts LCD
Range selection ................................Automatic within function
Overload indication..........................OL
Power consumption..........................40 mA
Battery life ........................................3000 measurements approx
Auto power down ............................5 minutes approx
Sampling time ..................................0.5 seconds
Operating temperature ....................0 to 50º C
Storage temperature..........................-20º C to 60º C
Operating humidity ..........................Less than 85% RH
Storage humidity ..............................Less than 75% RH
Dimensions........................................276 L X 100 W X 47 H (mm)
................................................
eight
W
Data logging capacity DET10C ........116 records
Data logging capacity DET20C ........8180 records
750g (1.65lbs)
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DET20C OPERATION
Jaw Assembly
Extra large opening – 35 mm
(1.36 in) to encircle electrode or
ground rod. No air is allowed
between the two jaw halves.
Jaw Trigger Lever
DET10C DET20C
arth/Ground Resistance & Leakage Current Clamp Testers
E
HOLD Button
Maintains last measurement
on the LCD display
Selector Switch
Quickly and easily select
• Leakage current (amps)
Leakage current (milliamps)
•
• High/Low Alarm
• Ground resistance (ohms)
FUNC Button
Used to select the following functions:
HI: high alarm level in ohms
LO: low alarm level in ohms
SEC: sampling interval (in seconds)
dI: download stored data to a PC
NO: allows scrolling through stored
readings
DET20C DISPLAY EXAMPLE
Function
1.
Digits
2.
3. Ohm Indicates resistance mode and alarm functions.
mA
4.
5. >>> Indicates instrument is set at the alarm position.
6. NOISE: Indicates ground resistance tester senses noise or
Jaw Open
7.
Low Battery
8.
NO.
9.
10.
REC
11. H Indicates “HOLD” function activated.
12. AP Indicates Auto Power Off activated. Deactivate
Display curr
record number.
Display value fr
Indicates gr
or A.
excessive current present in the ground
electrode.
Displayed if the jaws ar
measurement, this symbol and word OPEN will
be shown in LCD.
Indicates battery voltage is lower than r
Indicates the data r
Indicates data logging is in pr
by holding down the REC button then turning
on unit.
ent selected function or current
om 0 to 9999 with decimal point.
ound leakage curr
ecord number in memory.
ent mode in mA
e opened during the
equir
ogress.
ed.
11
LCD Panel
REC Button
Used to increment value or start
data download when the FUNC
button is in use. Also used to start
data logging or record a reading.
91076
5
1
8
12
2
4
3
DET20C Data Functions
• Store a specific r
• Data logging
• Adjustable sampling interval
• Data logging capacity up to 8180 records (DET20C)
• Review of stored data
• Download data to a PC for later analysis
eading
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DET10C DET20C
Earth/Ground Resistance & Leakage Current Clamp Testers
The DET20C instrument is shown being used to test a facility gro
ORDERING INFORMA
Item (Qty) Cat. No.
Digital Earth T
Digital Earth T
Included Accessories (DET10C and DET20C)
Carry case
Calibration loop
Battery (fitted)
Included Accessories (DET20C)
USB interface unit
Download Manager Software
est Clampmeter DET10C
est Clampmeter
und.
DET10C and 20C comes with a rugged carry case, calibration fixture,
carry case shoulder strap and USB interface cable (DET20C only).
TION
DET20C
UK
Archcliffe Road, Dover
CT17 9EN England
T (0) 1 304 502101
F (0) 1 304 207342
UNITED STATES
4271 Bronze Way
Dallas, TX 75237-1019 USA
T 1 800 723 2861
T 1 214 333 3201
F 1 214 331 7399
OTHER TECHNICAL SALES OFFICES
Norristown USA, T
Mumbai INDIA,
Le Raincy FRANCE, Cherrybrook
AUSTRALIA, Guadalajara SPAIN
and The Kingdom of BAHRAIN.
oronto CANADA,
ISO STATEMENT
Registered to ISO 9001:1994 Reg no. Q 09250
Registered to ISO 14001 Reg no. EMS 61597
DET20C_10C_DS_
.megger
www
Megger is a registered trademark
.com
en_V07
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