LEM HEME GEO 15 User manual

LEM SUBSIDIARIES
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GERMANY BELGIUM UK
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NETHERLANDS FRANCE
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Printed in Austria / Gedruckt in Österreich / Imprimé en Autriche / Stampato in Austria / Impreso en Austria
Distributor / Vertragshändler / Distributeur / Distributore / Distribuidor
LEM NORMA GmbH
Palmersstraße 2
A-2351 Wiener Neudorf
Tel: ++43(0)2236/691-0
Fax: ++43(0)2236 63 080
SO8115Z REV A
Right to change specification reserved /
Technische Änderungen vorbehalten /
Sous réserve de modifications /
Tutti i diritti di variazione tecnica riservat /i
Nos reservamos el derecho a modificaciones técnicas sin previo aviso
Operating Instructions /
Gebrauchsanleitung /
Manuel d’utilisation /
Guida all‘uso /
Manual de instrucciones
GROUND LOOP TESTER /
ERDSCHLEIFENMESSGERÄT /
APPAREIL DE TEST DE BOUCLE
DE TERRE /
TESTER DI TERRA A TENAGLIA /
MISURATORE DI TERRA
HEME GEO 15
ELMES •
••
•HEME •
••
•NORMA

Contents
- 2 -
Order Reference Order No.
HEME GEO 15 SE 8115 Z
Scope of delivery
1 battery 9V alkaline (type IEC LR6, installed)
1 Resistance testing/checking loop
1 Users manual E/G/F/I/ES
1 Professional carrying case
Unpacking: Check delivery for damage during transport.
Keep the packing material for later transport and check
scope of delivery.
Contents:
1 Safety Regulations..........................................................................3
2Description of Instrument...............................................................4
3 Using the resistance testing loop..................................................6
4Ground Loop Measurements..........................................................7
5Continuity Loop Test ......................................................................9
6 Ground Leakage Current Measurement........................................10
7 Principle of Operation...................................................................11
8 Specification .................................................................................13
9Maintenance, Service....................................................................16
10 Other products..............................................................................17

Safety Regulations
- 3 -
1 Safety Regulations
General
This measuring device is only to be installed and operated by qualified
personnel and according to the technical data in compliance with the
safety precautions and regulations set forth below. Additionally, the
use of this equipment requires compliance with all legal and safety
regulations pertaining to each specific application. Similar regulations
apply to the use of accessories.
Operating electrical devices implies that parts of the device carry dan-
gerous voltages. Disregarding warning notices may lead to serious
physical injury and material damage.
It can be assumed that safe operation is no longer possible if the de-
vice
• shows visible damage,
• has been exposed to unfavourable conditions (e.g. storage beyond
the permissible climatic limits without adaptation to the ambient climate,
dewing etc.) or
• has been exposed to major strain during transport (e.g. been
dropped from some height without visible external damage etc.).
No measurements must be performed on unprotected measuring cir-
cuits.
Qualified Personnel
Are persons familiar with the setting up, installation, starting of and operation
of the device and possess an appropriate qualification required for such ac-
tivities.
Special warnings
• Use of rubber gloves is a good safety practice even if the equipment is
properly operated and grounded.
• Safety is the responsibility of the operator.
• Use extreme caution when using the instrument around energized elec-
trical equipment.
• Do not attempt to use the ground tester to twist or pry the ground elec-
trode or ground wire away from the equipment being grounded.
• All metal objects or wires connected to the electrical system should be
assumed to be lethal until tested. Grounding systems are no exception.

Description of Instrument
- 4 -
2 Description of Instrument
The compliance with the actual EMC-regulations is documented by the at-
tached CE-sign.
The clamp-on ground resistance tester enables the user to measure ground
resistance of the ground rod without the use of auxiliary ground rods.
Clamp-on ground resistance testers are used in multi-grounded systems
without disconnecting the ground under test.
Applications:
• earth resistance of various installations (high voltage pylons, buildings,
cell phone substations, RF transmitters etc.)
• inspection of lightning protection systems
Instrument description:
cJaws: To enclose electrode or ground wire. No air gap is allowed
between the two halves of the jaws.
dHOLD button: Press this button to hold the displayed value
eRotary switch: Power on and function selection
fDisplay unit, liquid crystal display (LCD)
gTrigger: Press to open jaws
15A
TRUE RMS
HOLD
OFF
mA
A
Ground Loo
p
Te s te r
2
3
5
1
4

Description of Instrument
- 5 -
Display
cDigits Display value from 0 to 9999 with decimal point.
dOhm This symbol is shown when in Ωand continuity functions.
emA Display ground leakage current in mA or A
fContinuity This symbol is shown in the continuity function
gNOISE: Noise present in ground electrode or ground rod.
hJaw Open If the jaw is not properly closed during measurement, this
symbol and the word ”OPEN” will be shown on the LCD.
iLow Battery When the battery voltage is lower than required,
this symbol will be shown in LCD. Replace the
battery.

Using the resistance testing loop
- 6 -
3 Using the resistance testing loop
Using the resistance testing loop included in the scope of delivery, the correct func-
tion of the earth/ground loop tester can be verified. Prior to every proper measure-
ment, the testing loop can verify the functionality of the device and whether the
specified tolerances are being met or not. For example: The results of any meas-
urement can be invalidated through unforeseeable errors, sometimes requiring the
whole measurement to be repeated, which can be very time-consuming. It is rec-
ommended to use the resistance testing loop prior to every measurement. Test all
ranges that can be simulated with this loop.
nOpen clamping jaws. Ensure that the contact surfaces are clean and free of
dust, debris and other foreign substances.
oOpen and close the clamping jaws several times to obtain the best fit.
pTurn on device and set the dial to Ω.
Do not attach to a conductor and do not open the clamping jaws at
this time and during selfcalibration.
qFor better accuracy, the earth/ground resistance tester conducts a selfcalibration
during start-up. The user must wait until the selfcalibration has been completed.
The following appears on the LCD screen during the selfcalibration process:
CAL7, CAL6, ..., CAL2, CAL1.
rA beep signals that the device is ready for operation.
sAttach the device to the resistance loop at the chosen resistance value. It is
recommenced to measure all values available on the resistance loop.
tThe measured resistance is shown on the LCD screen. It must both match the
value given on the resistance loop and comply with the specified tolerances.
Note: To achieve a better measuring performance:
Open and close clamping jaws several times before the device is turned on.
Do not attach to a conductor upon start-up.
Note: If the selfcalibration takes longer then expected:
The selfcalibration process has not been completed yet. The device will continue
with the calibration until the process is complete. Check the contact areas of the
jaw surfaces. If dust, debris or other foreign substances are present, the surfaces
must be cleaned.

Ground Loop Measurements
- 7 -
4 Ground Loop Measurements
nOpen the jaws and make sure the jaw mating surfaces are clean and free of
dust, dirt or any foreign substances.
oSnap (open and close) the jaws a few times to ensure the jaws mate properly.
pTurn the power on, and set the rotary switch to the Ωposition.
Do not clamp on to any conductor or open the jaws at this moment
or during self-calibration.
qAt powering on, the clamp-on ground tester will self-calibrate for better accuracy.
Users should wait for the self-calibration to finish before making measurements.
During the self-calibration, the LCD will show CAL7, CAL6,..., CAL2, CAL1.
rWhen the ground tester is ready, a beep sound will be heard.
sClamp on to the electrode or ground rod to be measured.
tRead the value of Rg(ground loop resistance) from LCD.
Note: For better measurement:
Snap (open and close) the jaws a few times before powering on.
Do not clamp on to any conductor at the moment of powering on.
Note: If self-calibration does not stop:
This is because the self-calibration is not complete. The ground tester will con-
tinue the process until a proper self-calibration is complete.
Check the jaw mating surfaces. If there is any dirt, dust, or any foreign sub-
stance, clean the surface and power up again.
Note: Noise present in the electrode or ground rod:
If there exists over 3A current or 30V in ground rod, the symbol ”NOISE” will be
shown in LCD. Under the presence of noise, the reading is no longer accurate.
Note: If the jaw assembly is open during measurement, a symbol and the word
”OPEN” will be displayed on LCD.

Ground Loop measurements
- 8 -
Ground resistance measurements principle:
Equivalent circuit diagram:
Rg
R1R2......Rn
R
g

Continuity Loop Test
- 9 -
5 Continuity Loop Test
The testing procedures are the same as ground resistance measurement:
nOpen the jaws and make sure the jaw mating surfaces are clean and free of
dust, dirt or any foreign substances.
oSnap (open and close) the jaws a few times to ensure the jaws mate properly.
pTurn the power on, and set the rotary switch to the “Continuity” position.
Do not clamp on to any conductor or open the jaws at this moment
or during self-calibration.
qAt powering on, the clamp-on ground tester will self-calibrate for better accuracy.
Users should wait for the self-calibration to finish before making measurements.
During the self-calibration, the LCD will show CAL7, CAL6,..., CAL2, CAL1.
rWhen the ground tester is ready, a beep sound will be heard.
sClamp on to the electrode or ground rod to be measured.
tA beep sound will be heard if resistance Rgis less than 40 Ω.
R
g

Ground Leakage Current Measurement
- 10 -
6 Ground Leakage Current Measurement
nTurn the power on, set the rotary switch at the mA~ or A~ position.
oClamp on to the electrode or ground rod.
pRead the value of leakage current displayed on LCD.

Principle of Operation
- 11 -
7 Principle of Operation
The following diagram (fig. 1) shows a simplified typical grounded distribution sys-
tem. Its equivalent circuit (fig. 2) is shown below. If R1, R2, R3, ... Rnis combined
as Req, then only Rgand Req are left in the circuit (see figure). If a constant volt-
age is applied to the circuit, the following equation is valid:
eqg RR
I
U+=
where
ni
R
R
i
eq ,...2,1,
1
1==
∑
If Rgand R1, R2, ... Rnare about the same, and n is a large number (such as
200), then Req will be much less than Rgand maybe approach zero.
)0( →>> eqg RR
Example:
If Rgand R1, R2, ... Rnare all 10 Ω, respectively and n = 200, then Req by
calculation equals
Ω=
+++
=05,0
10
1
...
10
1
10
1
1
eq
R
In this example, we can see that as long as the number of multiple electrodes is
large enough, the equivalent resistance is negligible with respect to the ground
resistance to be measured.
geqg RRR
I
U→=+=+= 05,1005,010

Principle of Operation
- 12 -
Fig. 1 Typical grounded distribution systems
Fig. 2 Equivalent circuit diagram
U
I
R
g~
R
eq
U
I
R
g
~
.....R
n
R
1
R
2
R
3
R
4

Specification
- 13 -
8 Specification
Electrical Specification
Display: 9999 digit LC-display with special symbols
Temperature ranges:
Operating humidity: Less than 85% RH
Storage
temperature: -20 °C ... +60 °C (-4 °F ... +140 °F)
Storage humidity: Less than 75% RH
Reference temp.: +23 °C ±. 5 °C (+73 °F ±9 °F)
Temperature coeff.: 0,1% o. rdg. / Kelvin
Operating error: Refers to the operating temperature range
Protective type: IP20 according to IEC 529 / EN 60529
Safety: 300V, installation CAT III / pollution degree 2
(according to EN 61010-1:1992)
EMC (Emission): IEC 1000-4-2, IEC 61326-1 class B
EMC (Immunity): IEC 61000-4-2 8 kV (air) perf. criteria B,
IEC 61000-4-3 3 V/m perf. criteria A
Range selection: Auto
Overload indication: OL
Measuring time: 0,4 sec
Measurement
frequency: 1.667KHz
Auxiliary power: 9V alkaline (type IEC 6 LR 61)
Power consumption: 40 mA
Low battery
indication: Symbol
Mechanical Specification
Conductor size: 23mm (0.9") approx.
Dimensions: 257 mm (L) x 100 mm (W) x 47 mm (H)
10" (L) x 3.9"(W) x 1.9"(H)
Weight: 640 g (1,4 lbs)

Specification
- 14 -
Ground Loop Resistance (Autorange) :
Operating temp.: 0 °C ... +50 °C (+24 °F ... +122 °F)
Range Resolution Operating error(1)
0.025 - 0.250 Ω0.002
Ω±1.5%rdg ± 0.05 Ω
0.250 - 9.999 Ω0.02
Ω±1.5%rdg ±0.1 Ω
10.00 - 99.99 Ω0.04
Ω±2.0%rdg ±0.3 Ω
100.0 - 199.9 Ω0.4
Ω±3.0%rdg ±1.0 Ω
200.0 - 400.0 Ω2
Ω±5.0%rdg ±5 Ω
400.0 - 600.0 Ω5
Ω±10%rdg ± 10 Ω
600.0 - 1500 Ω20
Ω±20%
(1)Loop resistance with no inductance, external field < 50 A/m, external elec-
trical field < 1 V/m, conductor centered.
Continuity
Operating temp.: 0 °C ... +50 °C (+24 °F ... +122 °F)
Beep if resistance < approximately 40.00 Ω
Ground/Leakage Current mA~
Operating temp.: -10 °C ... +50 °C (+14 °F ... +122 °F)
(Autorange, 50/60 Hz, True RMS, crest factor CF< 3.0)
Range Resolution Operating error
0.200 - 1.000 mA 0.001 mA ±2.5%rdg ± 0.05 mA
1.00 - 10.00 mA 0.01 mA ±2.5%rdg ± 0.05 mA
10.0 - 100.0 mA 0.1 mA ±2.0%rdg ± 0.3 mA
100 - 1000 mA 1 mA ±2.0%rdg ±3mA
Ground/Leakage Current A~ (50/60 Hz, True RMS, crest factor CF< 3.0 )
Operating temp.: -10 °C ... +50 °C (+14 °F ... +122 °F)
Range Resolution Operating error
0.20 - 15.00 A 0.01 A ±2.0%rdg ± 0.03 A
Max. Current Protection: 100A continuous, 200A (< 60 sec.) 50/60Hz.
Current Overload Protection:
100A Continuous, 200A ( < 60 seconds) 50/60Hz.

Specification
- 15 -
Battery Replacement
When the low battery symbol is displayed in LCD, replace the battery.
• Turn the power off.
• Remove the bottom case screws.
• Lift and remove the bottom case.
• Remove the old battery.
• Install new 9V battery.
• Replace the bottom case and secure the screws.

Maintenance, Service
- 16 -
9 Maintenance, Service
If the instrument is operated and handled properly it does not require
specific maintenance and service. Maintenance work must only be un-
dertaken by trained and qualified staff and during the warranty period
only by authorised service centres.
Calibration
As an additional service we offer a regular inspection and calibration of
your instrument. Upon request and for a fee we supply company test
certificates or test certificates from national calibration services.
Storage
In case the instrument is either not used or stored for a longer period, re-
move the battery and keep it separately to avoid possible damage from leak-
ing battery electrolyte.
Service
This instrument has been manufactured and tested according to the latest
technological innovations and in compliance with the
quality assurance system DIN ISO 9001.
If there should still be reason for complaint please refer to your nearest ser-
vice centre, giving a detailed description of the defect by using the en-
closed service card and including a copy of the invoice or the delivery note. If
the instrument is operated as agreed we guarantee fault free function of the
instrument for a period of TWO (2) years after the date of the first end-user
purchase.
This warranty does not apply to any damage caused by improper treatment
or operation or by impermissible overload.
Packing
Use for shipping the original packing only. The manufacturer doesn't accept
any charges for damage that may have been caused by inappropriate pack-
ing.
year
WARRANTY
2 years
entitlement to repairs free of charge in case of malfunc-
tion of the instrument excluding damage caused by mis-
use.
Note: For reasons of clarity this manual does not contain de-
tailed information about all models and applications,
modes of operation and maintenance.
2

Other products
- 17 -
10 Other products
LEM offers a comprehensive range of electrical test products to ensure
the safe and efficient operation of electrical equipment and installations
including:
Earth/ground testers: HANDY GEO, SATURN GEO/easy/plus/X
Installation testers: SATURN 100, UNILAP 100 (X)E
Insulation testers: HANDY ISO, SATURN ISO, UNILAP ISO X,
ISO plus, ISO Tel 500, UNILAP ISO 5kV
Clamp-on meters: LH Series and Analyst 2050/60
Current probes: PR Series and LEM~Flex
Multimeters: Unigor Series
A full range of accessories are available including: interfaces (RS232,
IrDA

), data memory and PC-software for report generation.
Other products from the LEM group include systems and analysers for power
and power quality monitoring and transducers for current and voltage meas-
urement. LEM provides complete measurement solutions in current, voltage
and power quality - please, contact our sales partners world-wide for more
information.
LEM policy is one of continuous product im-
provement and the company reserves the
right to revise the above specifications with-
out notice.

Inhaltsverzeichnis
- 2 -
Bestellhinweise Bestellnummer
HEME GEO 15 SE 8115 Z
Lieferumfang
1 9 V Alkalibatterie /Typ IEC LR6, eingesetzt
1 Widerstandsprüfschleife
1 Gebrauchsanleitung E/D/F/I/ES
1 Tragtasche
Auspacken:Die Lieferung auf Transportschäden überprüfen.
Das Verpackungsmaterial für den späteren Transport
aufbewahren und den Lieferumfang überprüfen.
Inhaltsverzeichnis:
1 Sicherheitsbestimmungen.....................................................................3
2 Beschreibung.........................................................................................5
3 Verwendung der Widerstandsmeßschleife............................................7
4 Erdschleifenmessungen........................................................................8
5 Durchgangsschleifenprüfung..............................................................10
6 Messung des Erdleckstroms...............................................................11
7 Arbeitsprinzip ......................................................................................12
8 Kennwerte............................................................................................14
9 Wartung, Instandhaltung .....................................................................17
10 Andere Produkte................................................................................18

Sicherheitsbestimmungen
- 3 -
1 Sicherheitsbestimmungen
Allgemeines
Diese Meßeinrichtung ist nur von qualifiziertem Personal und aus-
schließlich entsprechend den technischen Daten in Zusammenhang mit
den nachstehend angeführten Sicherheitsbestimmungen und Vorschrif-
ten einzusetzen bzw. zu verwenden. Bei der Verwendung sind zusätz-
lich die für den jeweiligen Anwendungsfall erforderlichen Rechts- und
Sicherheitsvorschriften zu beachten. Sinngemäß gilt dies auch bei
Verwendung von Zubehör.
Beim Betrieb elektrischer Geräte stehen zwangsläufig bestimmte Teile
dieser Geräte unter gefährlicher Spannung. Bei Nichtbeachten der Si-
cherheitsbestimmungen (z.B. Berühren von Tastspitzen) können des-
halb schwere Körperverletzungen oder Sachschäden auftreten.
Es ist anzunehmen, daß ein gefahrloser Betrieb nicht mehr möglich ist, wenn
das Gerät
• eine sichtbare Beschädigung aufweist,
• längere Zeit ungünstigen Verhältnissen (z.B. Lagerung außerhalb
der zulässigen Klimagrenzen, Betauung o. ä.) oder
• schweren Transportbeanspruchungen (z.B. Fall aus großer Höhe
ohne sichtbare äußerliche Beschädigung, o. ä. ) ausgesetzt war.
Es dürfen keine Messungen an ungesicherten Meßkreisen durchgeführt
werden.
Qualifiziertes Personal
Sind Personen, die mit Aufstellung, Montage, Inbetriebsetzung und Betrieb
des Produktes vertraut sind und über die ihrer Tätigkeit entsprechende Qua-
lifikation verfügen.

Sicherheitsbestimmungen
- 4 -
Besondere Warnhinweise
• Das Tragen von Gummihandschuhen ist eine gute Schutzmaßnahme
auch wenn die Ausrüstung richtig bedient wird und geerdet ist.
• Der Bediener ist für seine eigene und die Sicherheit anderer verant-
wortlich.
• Extreme Vorsicht ist geboten, wenn das Gerät im Umfeld von stromfüh-
renden, elektrischen Anlagen eingesetzt wird
• Verwenden Sie den Erdschleifenmesser nicht, um den Erder oder den
Erdleiter von der geerdeten Ausrüstung weg zu drehen oder zu heben.
• Alle Metallgegenstände oder Drähte, die an das elektrische System an-
geschlossen sind, gelten solange als gefährlich bis sie überprüft wor-
den sind. Erdungssysteme sind dabei keine Ausnahme.