METREL Earth 2/3 Manual de usuario
Earth 2/3
MI 2126
Instruction Manual
Version 1.0, Code No. 20 750 190
2
Distributor:
Manufacturer:
METREL d.d.
Ljubljanska cesta 77
1354 Horjul
Slovenia
web site: http://www.metrel.si
e-mail: [email protected]
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
3
1Introduction.............................................................................................................4
1.1 General description............................................................................................4
1.2 Warnings............................................................................................................4
1.3 Standards applied..............................................................................................5
2Instrument 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
3Using instrument....................................................................................................9
3.1 Performing 3-wire measurement........................................................................9
3.2 Performing 2-wire measurement......................................................................11
3.3 General settings...............................................................................................14
4Maintenance..........................................................................................................16
4.1 Batteries...........................................................................................................16
4.2 Replacing fuse.................................................................................................17
4.3 Cleaning...........................................................................................................17
4.4 Periodic calibration..........................................................................................17
4.5 Service.............................................................................................................17
5Technical specification........................................................................................18
5.1 Functions.........................................................................................................18
5.2 General characteristics....................................................................................19
6Standard and optional accessories.....................................................................20
MI 2126 Earth 2/3 Introduction
4
1Introduction
We are very pleased to offer ahigh 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 aprofessional, 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 bythe equipment maybe impaired!
• Do not use the instrument and accessories if anydamage is noticed!
• Service intervention or adjustment and calibration procedure must onlybe
carried out bya competent, authorized person!
• Never connect the instrument to high voltage (U > 20 V).
• Turn power off and disconnect anymeasurement accessoryconnected to
the instrument before opening batterycover.
MI 2126 Earth 2/3 Introduction
5
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
6
2Instrument description
2.1 Instrument casing
The instrument is housed in aplastic enclosure, which maintains IP 40 protection class.
The casing consists of amain 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.
1
Earth 23
/
MI 2126
TEST
DISP
2
3
4
Figure 1. LCD display and front panel
Legend:
1Custom 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).
MI 2126 Earth 2/3 Instrument description
7
2.3 Connector panel
Use original test accessories only!
Neverconnect instrument to high voltage!
HS
E
1 2
3
Figure 2. Connector panel
Legend:
1Blue – test terminal H
2Red - test terminal S
3Black – test terminal E
2.4 Base
R
EARTH
Ser.No
.
1
2
4
3
Ser.No.
5
F
u
s
e
Figure 3. Base
MI 2126 Earth 2/3 Instrument description
8
Legend:
1Serial number.
2Information label.
3Battery cover.
4Screw to fix battery cover.
5Battery holder.
2.5 Instrument messages
Messages are generated on the LCD using special symbols and numeric segment
combinations. The following figure shows all of the possible display segments, and the
table below describes the messages.
Unit
Figure 4. Display segments
Description of possible display messages:
o.r. Result out of range.
and 20 V External voltage is higher than approx. 20 Veff.
and RC
Current spike resistance is too high.
(push key DISP)
and RP Potential spike resistance is too high.
and Noise voltage is higher than approx. 3 V.
Fr General settings – selection of frequency (50 Hz or 60 Hz).
t ┐, t ┐General settings – selection of measuring algoritm.
BAT Batteries are too weak – replace the batteries.
Table 1. Messages
Caution: if result of measurement is higher than 999 Ω, ohm character is not displayed.
MI 2126 Earth 2/3 Using instrument
9
3Using instrument
3.1 Performing 3-wire measurement
The Earth 2/3 is able to carry out earth resistance measurement using three wire test
method.
The distance fromthe earthing electrode (black,E)tothe currentmeasurementprobe
(blue, H) is atleast5times the lengthofearthing electrode rod orthe lengthofthe band
electrode (see Figure5).
If measuring the total earth resistance of acomplex earthing system, the required
distance depends on the longest (diagonal) distance (d) between the individual earthing
electrodes (see Figure 6).
Step 1
• Connect test leads to the instrument and to the object under test according to the
figures below.
Figure 5. Connection of standard 20 m long test leads
MI 2126 Earth 2/3 Using instrument
10
Figure 6. Connection of optional 50 m long test leads
REarthtot = RE1 || RE2 || RE3 || RE4
R E1..E4 Separate earthing resistances.
R PPotential spike resistance.
R CCurrent spike resistance.
R Earthtot Total earth resistance of tested earthing system.
Step 2
Press the ON/OFF key, the following menu will be displayed:
Ω
Figure 7. Earth resistance initial menu
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