Megger BT51 Manuel utilisateur

Digital Milliohmmeter

BT51

USER GUIDE

GUIDE DE L’UTILISATEUR

GEBRAUCHSANLEITUNG

GUÍA DEL USUARIO

Safety Warnings

■Safety Warnings and Testing Precautions must be read and understood before the instrument is used.

They must be observed during use.

■Circuit under test must be switched off, de-energised and isolated before any test connections are made.

■Test leads and handspikes must be in good order, clean and with no broken or cracked insulation.

■Circuit connections must not be touched during a test.

■The instrument must be earthed (grounded) when connected to a mains power source (for battery charging).

■Replacement fuses must be of the correct type and rating.

■The instrument should not be used if any part of it is damaged.

■Refer to pages 7 and 8 for further explanations and precautions.

■No user serviceable parts inside the instrument. Do not operate this equipment if damaged or faulty.

Return to authorised Megger Service centre for repairs

■Disconnect the mains lead before changing the mains inlet fuse. Always replace the fuse with one of the correct rating

to ensure protection from ﬁre: 100mA(T)HBC 250V 20mm.

■Warning! This instrument is measurement category O which means it is not rated for mains connection.

The measurement circuit will detect hazardous voltages up to 240V, but is not rated for higher voltage transients that occur on mains circuits.

Do NOT use where accidental connection to live mains circuits may occur.

■Additional safety warnings in the separate supplied “accessory important information sheet” must be observed

(DLROTestLeads--2007-431_UG_EN-DE-FR-ES-IT_V02)

NOTE - THE INSTRUMENTS MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.

CAT II -Measurement category II:

Equipment connected between the electrical

outlets and the user’s equipment.

CAT III - Measurement category III:

Equipment connected between the

distribution panel and the electrical outlets.

CAT IV - Measurement category IV:

Equipment connected between the origin

of the low-voltage mains supply and the

distribution panel.

Detachable hinges

Charnières amovibles

Abtrennbare scharniere

Bisagras desmontables Terminals

Bornes

Anschlüsse

Terminales

Dangerous voltage warning light

Tension dangereuse voyant d’avertissement

Gefährliche spannung Warnanzeige

Tensión peligrosa

Luz de advertencia

Indicating light for “test current flowing’

Voyant d’« écoulement du courant de test »

Anzeige für ‚prüfstrom ﬂießt’

Luz indicadora de ‘circulación de corriente de

prueba’

Digital display

Afﬁcheur numérique

Digitales display

Pantalla digital

Low battery voltage warning light

Voyant d’alerte de batterie faible

Warnanzeige für niedrige Akkuspannung

Luz de advertencia de tensión de

batería baja

Range selector switch

Commutateur de sélection

de gamme

Bereichswahlschalter

Conmutador de escalas

Battery charger socket cover

Couvercle de la prise du

chargeur de batterie

Abdeckung der akku-ladesteckdose

Tapa de toma para cargador

de batería

Battery charging neon light

Voyant néon de charge

de la batterie

Neonanzeige für die akkuladung

Luz de neón de carga de la batería

Mains supply fuse

Fusible de l’alimentation secteur

Netzversorgungssicherung

Fusible de alimentación de red

Hinged lid

Couvercle amovible

Abdeckung mit scharnieren

Tapa con bisagras

Features - Caractéristiques - Merkmale - Características

Contents Guide de l’utilisateur p13 Gebrauchsanleitung p23 Guía del usuario p37

Safety Warnings 2

General Description 6

Applications 7

Specification 8

Operation 9

Warning 11

The detachable lid 11

Performing a test 11

Using alternative leads 10

Charging the battery 10

Outline Diagram 4

Repair and Warranty 12

End of life disposal 12

General description

The BT51 uses the four terminal measurement principle. Current generated

within the instrument, passes between the current terminals C1 and C2 via

the test sample. The voltage across the test sample is measured across the

potential terminals P1 and P2.

The test current, of nominally 2A, is measured by monitoring the voltage

drop across an internal series resistor. The instrument compares this

voltage with the voltage across the P1 and P2 terminals and a ratiometric

measurement is performed. On the lower range a voltage amplifier is used.

Because the measurement is ratiometric the reading is unaffected by minor

variations of test current.

There are two measuring range, 2000 mWand 20 mW, selected by the

rotary switch that is also used to turn the instrument off. The readings are

indicated on a 31⁄2digit light emitting diode display which is easily seen in

poor lighting conditions.

A green L.E.D. indicator light glows when the test current is passing

between the C1 and C2 terminals as a test is made. A red neon light

adjacent to the terminal, illuminates as a warning of the presence of a

dangerous voltage, should the test lead probes be accidentally placed

across a “live”circuit. The instrument incorporates a relay protection

circuit (effective up to 240 V a. c. ) should such a connection occur. This

protection becomes operative at low voltages and the neon warning light

shows when a dangerous voltage is present. Both the neon warning light

and the protective relay are effective irrespective of whether or not the

instrument has been turned on prior to the probes being placed across the

voltage source.

Power for the instrument and the test circuit is obtained from internal

rechargeable NiCd cells. When the battery needs recharging a red L.E.D.

“low battery voltage” warning light illuminates next to the display. An

integral charger unit is fitted accompanied by a warning neon light to show

when the battery is under charge, and a fuse for protection.

Note :- It is advisable to ensure that the battery cells are fully

charged before embarking upon any tests.

The instrument is contained in a robust plastic case with a hinged

detachable lid that will automatically become unclipped if it is accidentally

thrown or dropped open, thus preventing damage to the hinges.

A variety of test lead set, some with duplex handspikes are available as

optional extras.

Applications

The BT51 is designed to measure the resistance of the bonding of

metalwork on large frames and structure, earth bond, able bond, lightning

conductors etc. and to check bus bar continuity. It is also able to measure

the resistance of the bonding of metalwork on aircraft. It has a resolution

of, 0,01 mW, and is able to check the resistance between metal points on

the aircraft structure

Symbols used on the Instrument

Caution, refer to accompanying documents

Equipment complies with current EU Directives

This equipment should be recycled as electronic waste

Power cord: If the power cord plug is not suitable for your

type of socket outlets (receptacles) do not

use an adaptor

You should use a suitable alternative power

cord, or if necessary change the plug by

cutting the cord and fitting a suitable plug

The colour code of the cord is

Earth (Ground) Yellow/Green

Neutral Blue

Phase (line) Brown

If using a fused plug, a 3 Amp fuse to BS 1362 should be fitted

Note: A plug severed from the power cord should be

destroyed, as a plug with bare conductors is hazardous in

a live socket outlet

Speciﬁcations

Ranges 2000 mΩ resolution 1 mΩ

20.00 mΩ resolution 0.01 mΩ

Test current 2 A to 2.5 A at any reading

Accuracy (0˚C to 50 ˚C) ± 1% ± 2 digits

Display 3 ½ digit L. E. D.

Temperature Range Operating 0 ˚C to +50 ˚C

Storage –20 ˚C to +50 ˚C

Protection Relay protection for up to 240 V a.c. power source applied

240 V model 100 mA (T) fuse 20 mm x 5 mm ceramic (For charging circuit)

115 V model 250 mA (T) fuse 20 mm x 5 mm ceramic (For charging circuit)

Power Supply Internal 4 Ah NiCd rechargeable cells and charging unit.

Normal charging time at 240 V is 10 hours

Safety The instruments meet the requirements for double insulation to IEC 61010-1.

E. M. C. In accordance with IEC 61326-1

Dimensions 344 mm (131⁄2ins) x 245 mm (9 5⁄8ins) x 158 mm (61⁄4ins)

Weight 4.5 kg (10 lb)

Cleaning Wipe disconnected instrument with a clean cloth dampened with soapy water or Isopropyl Alcohol (IPA).

Operational uncertainties Refer to www.megger.com

See Earth Leakage tolerance for 60Hz operation.

Operation

WARNING

Ensure that the equipment or conductor to be tested is de-energised before

connecting the instrument.

THE DETACHABLE LID

The lid hinges are fitted with spring loaded clips and are designed in this

way for two reasons. Firstly, if the lid is accidentally thrown open to its full

extent the hinges will not be strained or broken but the lid will be safely

unclipped. Secondly, the lid can purposely be removed if required when

the instrument is in use by simply opening it up to its full extent and gently

pressing down on the opening edge while holding the tester body firm.

The hinges will then unclip. To replace the lid, hold it vertically and push the

hinges back into their clips again while restraining the instrument. Then fold

the lid shut.

PERFORMING A TEST

(assuming duplex handspikes are used)

1. Connect the test leads to the instrument terminals

current leads to C1 and C2, potential leads to P1 and

P2. Note:- Duplex handspikes provided by Megger

Limited are identified as follows: The current lead is

black and the spade connector is stamped with a ‘C’,

the potential lead is red and the spade connector

is stamped with a ‘P’. On the handspikes themselves, the

potential spike is marked with a ‘P’.

2. Turn the range selector switch to the appropriate

position.

3. If it is desired check that the instrument is

functioning correctly by touching the two handspikes

onto a known low resistance piece of metal with the

potential spikes as close as possible to each other.

A zero reading should be obtained on the digital L.E.D. display.

Note:- Current will only pass when the circuit is completed between the

C1 and C2 spikes. The green L.E.D. light will illuminate to indicate when

this occurs. Make sure also that the low battery warning light does not

illuminate.

4. Press the handspike sets down on to the equipment

or conductor to be tested. (The handspikes may be as

far apart as the lead length will allow).

5. Read the resistance measured from the digital display

6. If the over-range symbol appears on the display when

the 20 mWrange is in use i.e. a ‘I’ as the left

hand digit with the remaining L. E. D’s blank, turn the

selector switch to the 2000 mWrange and repeat the

test. If the over-range symbol (i.e a ‘I’ as the left hand

digit) appears again the resistance being measured is

outside the range of the instrument.

Operation

7. After testing remove the handspike, turn the

selector switch to ‘Off’ and disconnect the test leads.

Caution:~ When the instrument is used for measuring an

inductive load, a voltage spike will appear across

the terminals. This occurs when the instrument is

switched between ranges or the test leads are

connected or disconnected. The instrument will

withstand voltage spikes caused when measuring

inductive loads (which include the test leads) of up to

250 mH.

USING ALTERNATIVE LEADS

For any of the C1, C2, P1 and P2 connection, test leads terminated with

bulldog clips or clamp connectors may be used. Single handspikes are

also suitable. Alternative test leads are available from Megger Limited (see

Accessories, page 11).

The testing procedure as given above should be followed. However, it must

be remembered when using fixed current connection, that as soon as the

connections are made and the circuit completed, the test current will flow

unless the selector switch is in the ‘Off’ position. Therefore, in order to

conserve battery power, it is advisable, whatever type of connections are

used to keep the time for the test as short as possible

With the fixed type of current connection, keep the selector switch in the

‘Off’ position while the connections are made and until the test is ready to

be performed

CHARGING THE BATTERY

If while performing a test the “low battery voltage” warning light

illuminates the batteries must be recharged.

1. Lift the battery charger socket cover to expose

the charger socket.

2. Connect a suitable three-pin plug to the battery

charger mains supply lead. Ensure that the earth wire

in the supply lead is connected so that the instrument

is earthed when charging the battery

3. Plug the lead into the instrument and then into

a convenient mains supply socket and switch on.

4. Allow the battery to charge for 10 hours.

Note ~ The instrument may be used to perform tests during charging,

providing the battery is not completely exhausted and has been allowed

a little time to recover its voltage. The mains supply cannot fulfill the test

current requirements ·without the aid of the battery. In these circumstances

problems in measurement may arise due to mains interference. A longer

charging time must be allowed if battery charging and testing are carried

out simultaneously. The battery will not be damaged by a longer charging

period.

5. After charging, switch off the mains power supply,

remove the charging lead and replace the battery

charger socket cover.

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