Gossen MetraWatt GEOHM C Manuel utilisateur

3-349-088-03

11/9.09

GMC-I Messtechnik GmbH

GEOHMC

Ground Resistance Tester

DQS certified per

DIN EN ISO 9001:2000

QUALITY MANAGEMENT SYSTEM

Reg.No.1262

Applications

The GEOHMC is a compact instrument for the measurement of

ground resistance in electrical systems in accordance with:

DIN VDE 0100 Installation of power systems with

nominal voltages of up to 1000 V

DIN VDE 0141 Grounding in AC systems with nominal

voltages of greater than 1 kV

DIN VDE 0800 Installation and operation of telecom-

munications systems including data

processing systems: equipotential

bonding and grounding

Testing of lightning protection systems in accordance with

DIN VDE 0185

The instrument is also capable of determining soil resistivity which

is essential in calculating dimensions for grounding systems.

It can thus be taken advantage of for simple, geological surveys,

and for the planning of grounding systems.

Beyond this, ohmic resistance can be measured at both solid and

liquid conductors, as well as internal resistance at conductive

elements, as long as these are capacitance and induction-free.

Special Functions

• Hold function: The measurement value is frozen at the display

after the measurement key is released.

• Storage of measurement values to memory

• Data interface for the transmission of measurement values

and for software updates

• Convenient report generating software,

can be expanded into a comprehensive database

Display

The LCD consists of a backlit dot matrix

display at which menus, setup options, measuring results and

online help can be viewed. Various display languages can be

selected depending upon the country in which the instrument is

used.

Signal Lamps

The instrument automatically recognizes errors which occur

during measurement, and signals them with four LEDs as shown

in the table below.

Operation

The instrument is easy to operate. A multifunction key allows for

one-hand operation for menu selections and the initialization of

measurements. Basic functions and sub-functions are selected

with the help of four softkeys.

The instrument functions in accordance with the ammeter-

voltmeter principle, and thus requires no balancing. Automatic

measuring range selection, limit value monitoring and direct

selection of 3 or 4-wire measurement assure easy

operation as well.

LED Status Measuring Function Meaning

UStör/

Unoise

red Interference voltage U > 10 V

Netz

Mains red Voltage Mains voltage is present

RS>max red Probe resistance Limit value exceeded

RH>max red Auxiliary earth electrode

resistance Limit value exceeded

Battery operated tester for the measurement of ground resistance meets

international standards for performing such tests. This instrument allows

measurement of soil resistivity and ohmic resistance by means of the

ammeter-voltmeter test method.

Features

• 3 or 4-wire measurement selectable from menu

• No balancing required

• Continuous monitoring of interference voltage and

auxiliary earth electrode resistance with indication

of limit value violations

• Indication is displayed if maximum probe resistance is

exceeded at the beginning of the measurement

• Voltage measurement with automatic switch-over function

between direct voltage and alternating voltage:

Direct voltage measuring range 1.0 250 V

(with polarity display)

Alternating voltage measuring range 0 300 V

GEOHMC

Ground Resistance Tester

2GMC-I Messtechnik GmbH

Battery Monitoring and Self-Test

A battery symbol with five segments ranging from depleted to fully

charged continuously indicates the charging level of the batteries

in the main menu.

Automatic shutdown ensures if the batteries are fully depleted,

and the instrument includes an integrated charge monitoring

circuit for safe charging of rechargeable NiMH or NiCd batteries.

During the self-test, a series of test patterns can be displayed one

after the other, and indicator LEDs and relays are tested.

Rugged Housing for Harsh Operating Conditions

Soft plastic jacketing protects the instrument against damage due

to impact and dropping.

Data Interface

Measurement data can be uploaded to a PC via the integrated

IRDA interface for processing and archiving, or for the generation

of official reports

Software Updates

The test instrument can always be kept current thanks to device

software updates via the IRDA interface. Software updates are

performed during the course of re-calibration by our service

department, or by the user himself.

Applicable Regulations and Standards

Regulations and Standards for Use of the Test Instrument

Sample Displays

Characteristic Values

1) Manual measuring range selection only

2) as from software version AD

3) For sinusoidal measured quantities only

Output voltage: max. 50 Vrms at 128 Hz 0.5 Hz

IEC 61010-1/EN 61010-1/

VDE 0411-1

Safety requirements for electrical equipment for

measurement, control and laboratory use

IEC 61557/ EN 61557/

VDE 0413

Devices for testing, measuring and monitoring protective

measures

Part 1: General requirements

Part 5: Earth resistance

DIN 43751 Part 1, 2 Digital measuring instruments

VDE 0106 Part 1 Protection against electrical shock, classification of

electrical and electronic equipment

EN 60529,

VDE 0470 Part 1

Test instruments and test procedures,

protection provided by enclosures (IP code)

DIN EN 61326-1

VDE 0843-20-1

Electrical equipment for measuement, control and

laboratory use – EMC requirements –

Part 1:General requirements

DIN VDE 0413 Part 5 Devices for testing, measuring and monitoring protective

measures

DIN VDE 0100 Regulations for the installation of power systems with

nominal voltages of up to 1000 V

DIN VDE 0141 Earthing in AC systems with nominal voltages of greater

than 1 kV.

DIN VDE 0800 Setup and operation of telecommunications systems

including electronic data processing:

equipotential bonding and grounding

DIN VDE 0185 Lightning protection systems – general installation

regulations

International regulations and standards

BS 7430 + BS 7671, NFC 15-100, IEC 60364

Measured

Quantity

Display Range Measuring Range Impedance /

Test Current

0.01 ... 20 

0.1 ... 200 

1 ... 2 k

10 ... 20 k

10 ... 50 k

1.0 ... 20 

5 ... 200 

50 ... 2 k

500 ... 20 k

500 ... 50 k1)

10 mA

1mA

100 µA

2) 1,0 ... 99.9 V

100 ... 250 V 10 ... 250 V 500 k

U~ 3) 0 ... 99.9 V

100 ... 300 V

f 3) 15 ... 99.9 Hz

100 ... 400 Hz 45 ... 200 Hz 500 k

Measured

Quantity

Intrinsic Uncertainty Measuring Uncertainty

RE(3% rdg.+6d)

(10% rdg. + 6d)

(16% rdg. + 10d)

(2% rdg.+2d) (4% rdg. + 3d)

U~ 3)

f 3) (0.1% rdg.+1d) (0,2% rdg. + 1d)

Main Menu

4-Wire Measurement Online Help

Measuring Range Selection

Direct Voltage Measurement Alternating Voltage Measurement

GMC-I Messtechnik GmbH 3

GEOHMC

Ground Resistance Tester

Reference Conditions

Battery Voltage 5.5 V 1%

Ambient Temperature + 23 C2 K

Relative Humidity 40 60%

Nominal Ranges of Use

Temperature Range 0 C +40C

Battery Voltage 4.5 6.5 V

Line Frequency 50/60 Hz 0.2 Hz

Line Voltage Waveshape sine (deviation between RMS

and rectified value 1%)

Nominal Conditions of Use

Series Mode

Interference Voltage < 3 V AC DC

Additional Error caused by

Probe and Auxiliary Earth

Electrode Resistance < 5% of (RE+ RA+ RP)

Max. Probe Resistance < 70 k

Max. Auxiliary Earth

Electrode Resistance < 50 k

Max. Earth and Auxiliary Earth

Electrode Resistance 50 k, see Figure REas a function

of RH

Ambient Conditions

Operating Temperature –10 ... + 50 C

Storage Temperature –20 ... + 60 C (without batteries)

Relative Humidity max. 75%,

no condensation allowed

Elevation max. 2000 m

Power Supply

Batteries 4 ea. 1.5 V C-size (4 x C-Size)

(alkaline-manganese per IEC LR14)

Battery Voltage 4.6 6.5 V

Battery Service Life 30 h or 1000 measurements at RE

(with 10 s on-time, each measurement

performed until the instrument switches

off automatically, without display

illumination)

Rechargeable Batteries NiCd or NiMH

Battery Charger NA 0100S (Article No. Z501D),

(not included) 3.5 mm jack plug

Charging Voltage 9 V

Charging Time approx. 9 hours

As a rule, fewer measurements can be performed with

rechargeable batteries due to their limited charging capacity.

Electrical Safety

Safety Class II per IEC 61010-1

Operating Voltage 250 V

Test Vol tage 2.3 k V

Measuring Category 250 V CAT II

Pollution Degree 2

Fuse F0.1H250V

Electromagnetic Compatibility (EMC)

Interference Emission/Immunity IEC 61326/EN 61326

Data Interface

Type infrared interface (SIR/IrDa)

bidirectional, half-duplex

Format 9600 baud, 1 start bit, 1 stop bit, 8 data

bits, no parity, no handshake

Range

max. 10 cm recommended distance: < 4 cm

Mechanical Design

Display multiple dot matrix display, 128 x 64

pixels (65 mm x 38 mm), illuminated

Dimensions 275 mm x 140 mm x 65 mm

Weight approx. 1.2 kg with batteries

Protection housing: IP 54 per EN 60529

with pressure compensating diaphragm

of microporous ePTFE, non-ageing,

8 mm dia. in battery compartment lid

Extract from table on the meaning of IP codes

Standard Equipment

1 GEOHMC test instrument

1 carrying strap

1 set of batteries

1 factory calibration certificate

set of comprehensive instructions covering the following topics:

– Measurement of earth resistance

with instructions for 3 and 4-wire methods,

with physical considerations regarding the potential

gradient area as related to dissipation resistance of

grounding systems of various size,

with important tips for the performance of measurements

on difficult terrain

– Measurement of soil resistivity with geologic analysis

and calculation of dissipation resistance

– Measurement of ohmic resistance

1 PC software WinProfi for communication with GEOHMC.

The PS3 CD-ROM includes the software WinProfi with the fol-

lowing content and functions:

• up-to-date test instrument software

– for loading other user interface languages

– for loading firmware version updates

• Transmission of measured data from test instrument to PC

0,5

0,5 25 50 RH [k]

RE [k]

IP XY

(1st digit X)

Protection against

foreign object entry

IP XY

(2nd digit Y)

Protection against the

penetration of water

32.5 mm



3 spraying water

41.0 mm



4 splashing water

5 dust protected 5 water jets

Edited in Germany • Subject to change without notice • A pdf version is available on the internet.

GEOHMC

Ground Resistance Tester

GMC-I Messtechnik GmbH

Südwestpark 15

90449 Nürnberg • Germany

Phone +49 911 8602-111

Fax +49 911 8602-777

E-Mail [email protected]

www.gossenmetrawatt.com

Accessories

E-Set 3, Earth Testing Set

E-Set 4, Earth Testing Set

E-Set 5, Earth Testing Set

Order Information

For additional information on accessories, please refer to

• our Measuring Instruments and Testers Catalog

• our website www.gossenmetrawatt.com

Designation Type Article Number

Basic Instrument

Digital Earth Tester GEOHMC M590A

Add-Ons

IR interface for connection to a USB

port at a PC for data exchange

between the PC and the GEOHMC,

e.g. for software updates to the

tester or visualization of measure-

ment values at the PC IrDa-USB Converter Z501J

Accessories

4 special NiMH baby cells

(rechargeable) Akku-Set GTY1040042E25

Adapter for charging batteries inside

the GEOHMC NA102 Z501N

Hard-shell case with compartment

for one C series test instrument and

accessories HC30-C Z541C

Earth testing set:

Synthetic leather case with 2 reels,

two 25 measurement cables, one

40 m measurement cable, two 3 m

measurement cables, 4 earth spikes

(zinc plated), 2 spike pullers and 1

hammer E-Set 3 GTZ3301005R0001

Earth testing set:

Synthetic leather case with 2 reels,

two 25 m cables, one 40 m cable,

two 3 m measurement cables and

4 earth drills E-Set 4 Z590A

Earth testing set:

Carrying case accommodating GEOHM



1 drum with 25 m measurement cable

2 drums with 50 m measurement

cable each

4 measurement cables,

3 x 0.5 m long, 1 x 2 m long

1 test clamp

4 earth drills, each 350 mm long

1 dust cloth

2 pads of earth testing

measurement data forms E-Set 5 Z590B

Reel with 25 m measurement cable

and banana plugs at both ends TR25 GTZ3303000R0001

Drum with 50 m measurement

cable, banana plug / jack socket TR50 GTY1040014E34

Earth drill, 35 cm long,

can be connected by means of

4 mm banana plugs SP350 GTZ3304000R0001

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