METREL Earth 2/3, MI 2126 Instruction Manual

Earth 2/3

MI 2126

Instruction Manual

Version 1.0, Code No. 20 750 190

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Distributor:

Manufacturer:

METREL d.d.
Ljubljanska cesta 77
1354 Horjul
Slovenia

web site: http://www.metrel.si
e-mail: [e-mail]

Mark on your equipment certifies that this equipment meets the requirements of the EU
(European Union) concerning safety and interference causing equipment regulations

© 2005 METREL

No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from METREL.

MI 2126 Earth 2/3 Table of contents

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1 Introduction.............................................................................................................4

1.1 General description............................................................................................4

1.2 Warnings............................................................................................................4

1.3 Standards applied..............................................................................................5

2 Instrument description...........................................................................................6

2.1 Instrument casing..............................................................................................6

2.2 Front panel.........................................................................................................6

2.3 Connector panel................................................................................................7

2.4 Base..................................................................................................................7

2.5 Instrument messages........................................................................................8

3 Using instrument....................................................................................................9

3.1 Performing 3-wire measurement........................................................................9

3.2 Performing 2-wire measurement......................................................................11

3.3 General settings...............................................................................................14

4 Maintenance..........................................................................................................16

4.1 Batteries...........................................................................................................16

4.2 Replacing fuse.................................................................................................17

4.3 Cleaning...........................................................................................................17

4.4 Periodic calibration..........................................................................................17

4.5 Service.............................................................................................................17

5 Technical specification........................................................................................18

5.1 Functions.........................................................................................................18

5.2 General characteristics....................................................................................19

6 Standard and optional accessories.....................................................................20

MI 2126 Earth 2/3 Introduction

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1 Introduction

We are very pleased to offer a high quality, professional grade test instrument, for
performing two- and three-wire earth resistance measurements, on which the estimation
of earthing quality is based. The equipment was designed and produced according to
many years of experience of producing and dealing with earth resistance and electric
installation test equipment.

1.1 General description

Earth 2/3 is a professional, hand–held, battery powered test instrument. It is intended
for carrying out earth resistance measurements in accordance with European standard
EN 61557 - 5.

The instrument is supplied with all accessories necessary for carrying out the tests.

1.2 Warnings

In order to ensure operator’s safety while carrying out various measurements and tests
using the Earth 2/3, as well as to keep the test equipment undamaged, it is necessary to
consider the following general warnings:

• symbol on the instrument means »Read the Instruction manual with

special care«. The symbol requires an action!

• If the test equipment is used in a manner not specified in this instruction

manual, the protection provided by the equipment may be impaired!

• Do not use the instrument and accessories if any damage is noticed!

• Service intervention or adjustment and calibration procedure must only be

carried out by a competent, authorized person!

• Never connect the instrument to high voltage (U > 20 V).

• Turn power off and disconnect any measurement accessory connected to

the instrument before opening battery cover.

MI 2126 Earth 2/3 Introduction

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1.3 Standards applied

Earth 2/3 instrument is manufactured and tested according to the following regulations,
listed below:

Electromagnetic compatibility (EMC)

EN 61326

Electrical equipment for measurement, control and laboratory
use – EMC requirements
Class B (Hand-held equipment used in controlled EM
environments)

Safety (LVD)

EN 61010-1

Safety requirements for electrical equipment for measurement,
control and laboratory use – Part 1: General requirements

Functionality

EN 61557-1
EN 61557-5

Electrical safety in low voltage distribution systems –
Part 1: General requirements
Part 5: Resistance to earth

MI 2126 Earth 2/3 Instrument description

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2 Instrument description

2.1 Instrument casing

The instrument is housed in a plastic enclosure, which maintains IP 40 protection class.
The casing consists of a main section, which includes the operator's panel and
connectors.

2.2 Front panel

The front panel consists of a custom LCD and a keyboard, see the figure below.

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Earth 23

/

MI 2126

TEST

DISP

234

Figure 1. LCD display and front panel

Legend:

1 Custom LCD.
2 DISP key to display subresults.
3 TEST key to start measurement.
4 ON/OFF key to switch ON and OFF the instrument (auto OFF will occur

automatically after 10 minutes of inactivity).