SIST EN 60081:1999/A2:2004

Double-capped fluorescent lamps - Performance specifications

Zweiseitig gesockelte Leuchtstofflampen - Anforderungen an die Arbeitsweise

Lampes à fluorescence à deux culots - Prescriptions de performance

Double-capped fluorescent lamps - Performance specifications - Amendment A2 (IEC 60081:1997/A2:2003)

General Information

• Status: Published
• Publication Date: 31-Dec-2003
• ICS: 29.140.30 - Fluorescent lamps. Discharge lamps
• Technical Committee: IESV - Lamps and related equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2004
• Due Date: 01-Jan-2004
• Completion Date: 01-Jan-2004
• Ref Project: EN 60081:1998/A2:2003 - Double-capped fluorescent lamps - Performance specifications

Relations

• Amends: SIST EN 60081:1999 - Double-capped fluorescent lamps - Performance specifications
• Effective Date: 01-Jan-2004
• Amends: SIST EN 60081:1999 - Double-capped fluorescent lamps - Performance specifications
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI SIST EN 60081:1999/A2:2004

STANDARD
januar 2004
(istoveten EN 60081:1998/A2:2003)
Double-capped fluorescent lamps - Performance specifications - Amendment A2
(IEC 60081:1997/A2:2003)
ICS 29.140.30 Referenčna številka
SIST EN 60081:1999/A2:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 60081/A2
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2003

ICS 29.140.30


English version


Double-capped fluorescent lamps -
Performance specifications
(IEC 60081:1997/A2:2003)


Lampes à fluorescence à deux culots - Zweiseitig gesockelte Leuchtstofflampen -
Prescriptions de performance Anforderungen an die Arbeitsweise
(CEI 60081:1997/A2:2003) (IEC 60081:1997/A2:2003)






This amendment A2 modifies the European Standard EN 60081:1998; it was approved by CENELEC on
2003-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60081:1998/A2:2003 E

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EN 60081:1998/A2:2003 - 2 -
Foreword
The text of document 34A/1020/FDIS, future amendment 2 to IEC 60081:1997, prepared by SC 34A,
Lamps, of IEC TC 34, Lamps and related equipment, was submitted to the IEC-CENELEC parallel
vote and was approved by CENELEC as amendment A2 to EN 60081:1998 on 2003-04-01.
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-01-01
– latest date by which the national standards conflicting
(dow) 2006-04-01
with the amendment have to be withdrawn
Annexes designated "normative" are part of the body of the standard.
In this standard, annexes A, B and C are normative.
__________
Endorsement notice
The text of amendment 2:2003 to the International Standard IEC 60081:1997 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________

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NORME
CEI


INTERNATIONALE
IEC


60081
INTERNATIONAL

AMENDEMENT 2
STANDARD
AMENDMENT 2

2003-03

Amendement 2
Lampes à fluorescence à deux culots –
Prescriptions de performance
Amendment 2
Double-capped fluorescent lamps –
Performance specifications
Les feuilles de cet amendement sont à insérer dans la
CEI 60081 (1997)
The sheets contained in this amendment are to be
inserted in IEC 60081 (1997)
 CEI 2003 Droits de reproduction réservés  Copyright - all rights reserved

International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
W
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

---------------------- Page: 4 ----------------------

INSTRUCTIONS POUR L’INSERTION INSTRUCTIONS FOR THE INSERTION
DES NOUVELLES PAGES ET FEUILLES OF NEW PAGES AND STANDARD SHEETS
DE NORMES DANS LA CEI 60081 (1997) IN IEC 60081 (1997)
__________ __________
1. Retirer la page de titre existante, les pages 2, 1. Remove existing title page, pages 3, 5, I-2,
4, I-1, I-3, I-9, A-1, A-3, A-5, A-9, B-9, B-11, I-8, I-10, A-2, A-4, A-8, B-8, B-10, B-12,
B-13 et insérer la nouvelle page de titre, les B-14 and insert in their places the new title
nouvelles pages 2, 4, I-1, I-3, I-9, A-1, A-3, page, pages 3, 5, I-2, I-8, I-10, A-2, A-4,
A-5, A-9, B-9, B-11, B-13, B-15, C-1. A-8, B-8, B-10, B-12, B-14, B-16.
2. Retirer les pages 2 des feuilles 2. Remove page 2 of sheets
60081-IEC-5340 60081-IEC-5340
60081-IEC-5430 60081-IEC-5430
60081-IEC-5440 60081-IEC-5440
60081-IEC-5960 60081-IEC-5960
60081-IEC-5970 60081-IEC-5970
60081-IEC-5980 60081-IEC-5980
et insérer les nouvelles pages 2 des and insert the following new page 2 of
feuilles suivantes: sheets:
60081-IEC-5340 60081-IEC-5340
60081-IEC-5430 60081-IEC-5430
60081-IEC-5440 60081-IEC-5440
60081-IEC-5960 60081-IEC-5960
60081-IEC-5970 60081-IEC-5970
60081-IEC-5980 60081-IEC-5980
2. Retirer les feuilles 2. Remove sheets
60081-IEC-6030 (2 pages) 60081-IEC-6030 (2 pages)
60081-IEC-6040 (2 pages) 60081-IEC-6040 (2 pages)
60081-IEC-6050 (2 pages) 60081-IEC-6050 (2 pages)
60081-IEC-6060 (2 pages) 60081-IEC-6060 (2 pages)
60081-IEC-6520 (2 pages) 60081-IEC-6520 (2 pages)
60081-IEC-6530 (2 pages) 60081-IEC-6530 (2 pages)
60081-IEC-6620 (2 pages) 60081-IEC-6620 (2 pages)
60081-IEC-6640 (2 pages) 60081-IEC-6640 (2 pages)
60081-IEC-6650 (2 pages) 60081-IEC-6650 (2 pages)
60081-IEC-6730 (2 pages) 60081-IEC-6730 (2 pages)
60081-IEC-6750 (2 pages) 60081-IEC-6750 (2 pages)
60081-IEC-6840 (2 pages) 60081-IEC-6840 (2 pages)
60081-IEC-6850 (2 pages) 60081-IEC-6850 (2 pages)
et insérer les nouvelles feuilles suivantes: and insert the following new sheets:
60081-IEC-6030 (2 pages) 60081-IEC-6030 (2 pages)
60081-IEC-6040 (2 pages) 60081-IEC-6040 (2 pages)
60081-IEC-6050 (2 pages) 60081-IEC-6050 (2 pages)
60081-IEC-6060 (2 pages) 60081-IEC-6060 (2 pages)
60081-IEC-6520 (2 pages) 60081-IEC-6520 (2 pages)
60081-IEC-6530 (2 pages) 60081-IEC-6530 (2 pages)
60081-IEC-6620 (2 pages) 60081-IEC-6620 (2 pages)
60081-IEC-6640 (2 pages) 60081-IEC-6640 (2 pages)
60081-IEC-6650 (2 pages) 60081-IEC-6650 (2 pages)
60081-IEC-6730 (2 pages) 60081-IEC-6730 (2 pages)
60081-IEC-6750 (2 pages) 60081-IEC-6750 (2 pages)
60081-IEC-6840 (2 pages) 60081-IEC-6840 (2 pages)
60081-IEC-6850 (2 pages) 60081-IEC-6850 (2 pages)
___________

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60081 Amend. 2 © CEI/IEC:2003
AVANT-PROPOS
Le présent amendement a été établi par le sous-comité 34A : Lampes, du comité d'études 34
de la CEI: Lampes et équipements associés.
Le texte de cet amendement est issu des documents suivants:
FDIS Rapport de vote
34A/1020/FDIS 34A/1028/RVD

Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cet amendement.
Le comité a décidé que le contenu de la présente publication ne sera pas modifié avant 2004.
A cette date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
• amendée.
___________

FOREWORD
This amendment has been prepared by subcommittee 34A: Lamps, of IEC technical committee
34: Lamps and related equipment.
The text of this amendment is based on the following documents:
FDIS Report on voting
34A/1020/FDIS 34A/1028/RVD

Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

___________

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NORME CEI

INTERNATIONALE
IEC



60081
INTERNATIONAL

Edition 5.2
STANDARD



2003-03



Edition 5, modifiée selon les amendements 1 (2000) et 2 (2003)

Edition 5, amended in accordance with amendments 1 (2000) and 2 (2003)


Lampes à fluorescence à deux culots –
Prescriptions de performance

Double-capped fluorescent lamps –
Performance specifications

 IEC 2003 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия

---------------------- Page: 7 ----------------------

60081  IEC:1997        – 3 –
CONTENTS
FOREWORD. 5
1 General . I-2
1.1 Scope. I-2
1.2 Statement. I-2
1.3 Normative references . I-2
1.4 Definitions . I-4
1.5 Lamp requirements. I-6
1.6 Information for ballast and starter design . I-10
1.7 Information for luminaire design. I-10
Annexes
A Method of test for starting characteristics . A-2
B Method of test for electrical, photometric and cathode characteristics. B-2
C Method of test for lumen maintenance and life . . C-2
D Chromaticity co-ordinates . D-2
E Information for ballast and starter design. . E-2
F Information for luminaire design . F-2
2 Data sheets . II-2
2.1 General principles of numbering of data sheets. II-2
2.2 Diagrammatic data sheets for location of lamp dimensions. II-2
2.3 Lamp data sheets . II-4

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60081 © IEC:1997+A1:2000+A2:2003 – 5 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________

DOUBLE-CAPPED FLUORESCENT LAMPS –
PERFORMANCE SPECIFICATIONS



FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60081 has been prepared by subcommittee 34A: Lamps, of IEC
technical committee 34: Lamps and related equipment.
This consolidated version of IEC 60081 is based on the fifth edition (1997) [documents
34A/759/FDIS and 34A/778/RVD], its amendment 1 (2000) [documents 34A/896/FDIS and
34A/907/RVD] and its amendment 2 (2003) [documents 34A/1020/FDIS and 34A/1028/RVD].
It bears the edition number 5.2.
The committee has decided that the contents of the base publication, its amendment 1 and its
amendment 2 will remain unchanged until 2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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60081 Amend. 2 © IEC:2003 – I-2 –

DOUBLE-CAPPED FLUORESCENT LAMPS –
PERFORMANCE SPECIFICATIONS



1 General
1.1 Scope
This International Standard specifies the performance requirements for double-capped
fluorescent lamps for general lighting service.
The requirements of this standard relate only to type testing. Conditions of compliance,
including methods of statistical assessment, are under consideration.
The following lamp types and modes of operation are included:
a) lamps having preheated cathodes, designed for operation on a.c. mains frequencies with
the use of a starter, and additionally operating on high frequency;
b) lamps having preheated high-resistance cathodes, designed for operation on a.c. mains
frequencies without the use of a starter (starterless), and additionally operating on high
frequency;
c) lamps having preheated low-resistance cathodes, designed for operation on a.c. mains
frequencies without the use of a starter (starterless), and additionally operating on high
frequency;
d) lamps having preheated cathodes, designed for operation on high frequency;
e) lamps having non-preheated cathodes, designed for operation on a.c. mains frequencies;
f) lamps having non-preheated cathodes, designed for operation on high frequency.
For some of the requirements given in this standard, reference is made to “the relevant lamp
data sheet”. For some lamps these data sheets are contained in this standard. For other
lamps, falling under the scope of this standard, the relevant data are supplied by the lamp
manufacturer or responsible vendor.
1.2 Statement
It may be expected that lamps which comply with this standard will start and operate
satisfactorily at voltages between 92 % and 106 % of rated supply voltage and at an ambient
air temperature of between 10 °C and 50 °C, when operated with a ballast complying with
IEC 60921 or IEC 60929, where relevant with a starter complying with IEC 60155 or IEC
60927, and in a luminaire complying with IEC 60598.
1.3 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60050(845):1987, International Electrotechnical Vocabulary (IEV) – Chapter 845: Lighting

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60081  IEC:1997 – I-8 –
1.5.2 Caps
The dimensions of the caps on a finished lamp shall be in accordance with IEC 60061-1.
a) For lamps with G5 or G13 caps, both pins (excluding flanges) of the two caps of a finished
lamp shall pass simultaneously, freely without binding, through parallel slots, suitably
spaced longitudinally to receive the lamp. The slots shall each be 2,87 mm wide for G5
caps, and 3,05 mm wide for G13 caps.
b) For lamps with R17d caps, both cap bosses of a finished lamp shall pass simultaneously,
freely without binding, through parallel slots, suitably spaced longitudinally to receive the
lamp with the bottom of the slots against the boss ends. The slots shall each be 6,35 mm
deep and 9,22 mm wide.
1.5.3 Dimensions
The dimensions of a lamp shall comply with the values specified on the relevant lamp data
sheet.
1.5.4 Starting characteristics
A lamp shall start fully within the time specified on the relevant lamp data sheet and remain
alight.
Conditions and method of test are given in annex A.
1.5.5 Electrical and cathode characteristics
a) The initial reading of the voltage at the lamp terminals shall comply with the values specified
on the relevant lamp data sheet.
b) The initial reading of the power dissipated by a lamp shall not exceed the rated wattage,
specified on the relevant lamp data sheet, by more than 5 % + 0,5 W.
NOTE – Cathode watts due to supplementary heating are not included in the rated lamp wattage unless otherwise
stated on the lamp data sheet.
c) For a lamp having preheated cathodes for operation on a.c. mains frequencies starterless
circuits, the initial reading of the resistance of each cathode shall be not less than the
minimum value specified on the relevant lamp data sheet.
d) For a lamp having preheated cathodes for operation on high frequency, the initial reading of
the resistance of each cathode shall comply with the values specified on the relevant lamp
data sheet.
Conditions and method of test are given in annex B.
1.5.6 Photometric characteristics
a) The initial reading of the luminous flux of a lamp shall be not less than 92 % of the rated
value.
b) The initial reading of the chromaticity coordinates x and y of a lamp shall be within 5 SDCM
(standard deviation of colour matching) from the rated values.
NOTE – See also annex D on chromaticity co-ordinates.
c) The initial reading of the general colour rendering index Ra of a lamp shall be not less than
the rated value decreased by three.
Conditions and method of test are given in annex B.

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60081 Amend. 2 © IEC:2003 – I-10 –

1.5.7 Lumen maintenance
The lumen maintenance of a lamp shall be not less than 92 % (under consideration) of the
rated lumen maintenance value at any time in its life.
Conditions and method of test are given in annex C.
1.5.8 Marking
A lamp shall be marked with an identification which defines, with the aid of information made
available by the manufacturer or responsible vendor, the electrical and photometric
characteristics of the lamp.
1.6 Information for ballast and starter design
Refer to the relevant lamp data sheet and to annex E for information for ballast and starter
design.
1.7 Information for luminaire design
Refer to annex F for information for luminaire design.

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60081  IEC:1997 – A-2 –
Annex A
(normative)
Method of test for starting characteristics
A.1 General
Tests shall be made in a draught-free atmosphere at an ambient temperature of between 20 °C
and 27 °C and a relative humidity of 65 % maximum.
Metallic parts and wires in the vicinity of the lamp, except starting aids when required, shall be
avoided as far as possible.
Immediately prior to the starting test the lamps shall be kept inoperative and in an ambient
temperature of between 20 °C and 27 °C and a relative humidity of 65 % maximum for a period
of at least 24 h.
A.2 Lamps having preheated cathodes for operation on a.c. mains frequencies
with the use of a starter
A.2.1 Test circuit
Lamps shall be tested with a 50 Hz or 60 Hz supply in the circuit shown in figure A.1.
A.2.2 Ballast
The ballast used shall be of the inductive type, unless specified otherwise on the relevant lamp
data sheet, and shall comply with the requirements of IEC 60921. It shall be rated as specified
on the relevant lamp data sheet. Where a capacitive circuit is specified, additionally the
capacitor used shall comply with the requirements of IEC 61049.
When the ballast, at its rated voltage, is associated with a test lamp, the lamp shall dissipate a
power which does not differ from its rated value by more than 4 %. A test lamp is a lamp whose
voltage at lamp terminals does not deviate by more than 2 % from its rated value, when
operated with its reference ballast.
The preheating current, when measured at 90 % of rated ballast voltage, shall be between 1,1
and 1,2 times the rated lamp current. To obtain a value of the preheating current within this
range, it may be necessary either to make a special selection from among commercial ballasts
or else to design and manufacture a ballast for this specific purpose. In some cases, it may be
possible to bring the preheating current down to be within this range by adding resistance in
series with the starter.
NOTE – In some cases the ballast may include an autotransformer to increase (or reduce) the voltage to the proper
value for the starting and operation of the lamp. Ballasts incorporating step-up transformers are particularly likely to
be used in countries where 120 V or 100 V power systems predominate.

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60081 Amend. 2 © IEC:2003 – A-4 –

A.2.3 Starter
The type of glow starter to be used shall comply with the requirements of IEC 60155, and
shall in any case be subject to agreement with the lamp manufacturer or responsible vendor.
A.2.4 Test voltage
The test voltage applied to the circuit shall be as specified on the relevant lamp data sheet.
A.3 Lamps having preheated cathodes for operation on a.c. mains frequencies
without the use of a starter (starterless)
A.3.1 Test circuit
Lamps shall be tested with a 50 Hz or 60 Hz supply in the circuit shown in figure A.2.
A.3.2 Ballast
The ballast used shall be of the inductive type, and shall comply with the requirements of
IEC 60921. It shall be rated as specified on the relevant lamp data sheet.
When the ballast, at its rated voltage, is associated with a test lamp, the lamp shall dissipate
a power which does not differ from its rated value by more than 4 %. A test lamp is a lamp
whose voltage at lamp terminals does not deviate by more than 2 % from its rated value,
when operated with its reference ballast.
NOTE 1 In some cases the ballast may include an autotransformer to increase (or reduce) the voltage to the
proper value for starting and operation of the lamp. Ballasts incorporating transformers are particularly likely to be
used in countries where 100 V, 120 V, 200 V, 277 V or 347 V power systems predominate.
NOTE 2 The earthing of the circuit as shown in figure A.2 may make it necessary to supply it through an isolating
transformer.

A.3.3 Starting aid
The starting aid, a metal plate, shall be connected to earth potential together with one lamp
cathode. Its length shall be not less than that of the lamp under test and it shall be 25 mm
wide for 16 mm diameter lamps and 40 mm wide for 26 mm to 38 mm diameter lamps. The
distance between the surface of the lamp and the starting aid shall be as specified on the
relevant lamp data sheet.
The manufacturer or responsible vendor shall specify whether or not the lamps require an
external starting aid, and whether one cathode shall be connected to earth potential. For
lamps not requiring a separate starting aid, the metal plate shall be removed.
A.3.4 Test voltages
The voltage of the heating circuit to be applied to the cathode terminals and the open circuit
voltage at the lamp terminals for the starting test shall be as specified on the relevant lamp
data sheet.
NOTE The voltages specified for the starting test are chosen primarily to secure reproducibility of test results, and
are not necessarily applicable to the design of ballasts.

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60081  IEC:1997 – A-8 –
A.5.2 Ballast
The non-inductive ballast resistor shall be so adjusted that the high frequency lamp current is
equal to the value as specified on the relevant lamp data sheet.
A.5.3 Starting aid
For lamps with preheated cathodes, the starting aid, a metal plate, shall be connected to earth
potential together with one lamp cathode. Its length shall be not less than that of the lamp
under test, and it shall be 25 mm wide for 16 mm diameter lamps, and 40 mm wide for 26 mm
to 38 mm diameter lamps. The distance between the surface of the lamp and the starting aid
shall be as specified on the relevant lamp data sheet.
The manufacturer or resposible vendor shall specify whether or not the lamps require an
external starting aid, and whether one cathode shall be connected to earth potential. For lamps
not requiring a separate starting aid, the metal plate shall be removed.
A.5.4 Test voltage and current
For lamps with preheated cathodes, the cathode heating supplies shall be adjusted to supply a
preheat current as specified on the relevant lamp data sheet. During the preheat time,
specified on the relevant lamp data sheet, switch S shall be kept open and switches S closed.
1 2
After this period of time, switches S shall be opened simultaneously as switch S is closed.
2 1
The open circuit voltage applied to the circuit shall be as specified on the relevant lamp data
sheet.

---------------------- Page: 15 ----------------------

60081  IEC:1997 – B-8 –
The centre value of the cathode voltage for low-resistance cathodes is 3,6 V, and it is
convenient to use a regular 6,3 V filament transformer operated at a reduced primary voltage
so that an output of 3,6 V is obtained.
B.2.4 Calibration of cathode heating transformer
Each cathode transformer (or pair of transformers) shall be individually calibrated to determine
the power loss that will exist during normal operation.
This power will vary with the current to be supplied to the particular type of cathode involved.
These loss values, however, need to be determined only once for a given transformer for each
cathode type. The appropriate transformer loss can then be applied to the measurement of the
various types of lamps.
It is convenient to obtain a "voltage calibration" on each transformer. This involves determining
the primary voltage that must be set in order to obtain the required secondary output voltage.
This calibration, although not entirely essential, makes it possible to use primary voltage
settings in all routine work, thus avoiding the need for constant use of the more fragile low-
range thermocouple voltmeters.
In making the calibration, each secondary winding of the transformer should be connected to a
substitution resistor, having the electrical characteristics specified for the particular cathode
type involved. The primary voltage should be adjusted so that the average of the two secondary
voltages is 3,6 V, and the value of the primary voltage should then be recorded. It is essential
that this calibration is repeated for any other cathode type with which the transformer is used.
2
E /R loss considered together) shall also be
The power loss in the transformer (core loss and
determined for each load condition. With the primary voltage again set so as to give the
specified voltage of 3,6 V across the substitution resistors, the power input shall be read.
(Since the total wattage to be read is likely to be below 10 W, a low-range wattmeter shall be
used). The loss in the transformer may be calculated as the wattage input reading, minus the
instrument corrections, and also minus the power absorbed by the substitution resistors. This
2
power in the resistors can be calculated as E /R for each of the windings.
The transformer loss is assumed to be constant for all lamps having the same cathode
resistance, and no allowance is necessary for the slight differences resulting from variations in
actual cathodes.
B.3 Cathode character
...