IEC 60384-9:2024

IEC 60384-9 ®
Edition 5.0 2024-08
REDLINE VERSION
INTERNATIONAL
STANDARD
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inside
Fixed capacitors for use in electronic equipment –
Part 9: Sectional specification – Fixed capacitors of ceramic dielectric, Class 2

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IEC 60384-9 ®
Edition 5.0 2024-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fixed capacitors for use in electronic equipment –
Part 9: Sectional specification – Fixed capacitors of ceramic dielectric, Class 2
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.060.20 ISBN 978-2-8322-9576-2

– 2 – IEC 60384-9:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 6
1 General .
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Preferred ratings and characteristics . 9
4.1 Preferred characteristics . 9
4.2 Preferred values of ratings . 10
4.2.1 Rated temperature . 10
4.2.2 Rated voltage (U ) . 10
R
4.2.3 Category voltage (U ). 10
C
4.2.4 Preferred values of nominal capacitance and associated tolerance
values . 10
4.2.5 Temperature characteristic of capacitance . 10
5 Test and measurement procedures . 11
5.1 General . 11
5.2 Special preconditioning . 11
5.3 Visual examination and check of dimensions . 12
5.4 Electrical tests . 12
5.4.1 Capacitance . 12
5.4.2 Tangent of loss angle (tan δ) . 12
5.4.3 Insulation resistance (R ). 13
i
5.4.4 Voltage proof . 13
5.5 Temperature characteristic of capacitance (reference temperature 20 °C) . 14
5.5.1 Special preconditioning . 14
5.5.2 Measuring conditions . 14
5.5.3 Requirements . 15
5.6 Robustness of terminations . 15
5.7 Resistance to soldering heat . 15
5.7.1 General . 15
5.7.2 Special preconditioning . 15
5.7.3 Initial measurement . 15
5.7.4 Recovery . 16
5.7.5 Final inspection, measurements and requirements. 16
5.8 Solderability . 16
5.8.1 General . 16
5.8.2 Test conditions . 16
5.8.3 Final inspection, measurements and requirements. 16
5.9 Rapid change of temperature (if required) . 16
5.9.1 General . 16
5.9.2 Special preconditioning . 16
5.9.3 Initial measurement . 17
5.9.4 Test conditions . 17
5.9.5 Recovery . 17
5.10 Vibration . 17
5.10.1 General . 17

5.10.2 Test conditions . 17
5.10.3 Final inspection, measurements and requirements. 17
5.11 Bump (repetitive shock) . 17
5.11.1 General . 17
5.11.2 Initial measurements . 17
5.11.3 Test conditions . 17
5.11.4 Final inspection, measurements and requirements. 18
5.12 Shock (non-repetitive shock) . 18
5.12.1 General . 18
5.12.2 Initial measurements . 18
5.12.3 Test conditions . 18
5.12.4 Final inspection, measurements and requirements. 18
5.13 Climatic sequence. 19
5.13.1 General . 19
5.13.2 Special preconditioning . 19
5.13.3 Initial measurements . 19
5.13.4 Dry heat . 19
5.13.5 Damp heat, cyclic, Test Db, first cycle . 19
5.13.6 Cold. 19
5.13.7 Low air pressure . 19
5.13.8 Damp heat, cyclic, Test Db, remaining cycles . 20
5.14 Damp heat, steady state . 21
5.14.1 General . 21
5.14.2 Special preconditioning . 21
5.14.3 Initial measurement . 21
5.14.4 Test conditions . 21
5.14.5 Recovery . 22
5.14.6 Final inspection, measurements and requirements. 22
5.15 Endurance . 23
5.15.1 General . 23
5.15.2 Special preconditioning . 23
5.15.3 Initial measurement . 23
5.15.4 Test conditions . 23
5.15.5 Recovery . 23
5.15.6 Final inspection, measurements and requirements. 23
5.16 Component solvent resistance (if applicable) . 24
5.17 Solvent resistance of the marking (if applicable) . 24
6 Marking . 24
6.1 General . 24
6.2 Information for marking . 24
6.3 Marking on the body . 25
6.4 Marking on the packaging . 25
6.5 Additional marking . 25
7 Information to be given in a detail specification . 25
7.1 General . 25
7.2 Outline drawing and dimensions . 25
7.3 Mounting . 26
7.4 Ratings and characteristics . 26
7.4.1 General . 26

– 4 – IEC 60384-9:2024 RLV © IEC 2024
7.4.2 Nominal capacitance range . 26
7.4.3 Particular characteristics . 26
7.4.4 Soldering . 26
7.5 Marking . 26
8 Quality assessment procedures . 26
8.1 Primary stage of manufacture . 26
8.2 Structurally similar components . 27
8.3 Certified test records of released lots . 27
8.4 Qualification approval . 27
8.4.1 General . 27
8.4.2 Qualification approval on the basis of the fixed sample size procedure . 27
8.4.3 Tests . 27
Annex A (informativenormative) Capacitance ageing of fixed capacitors of ceramic
dielectric, Class 2 . 37
A.1 General . 37
A.2 Law of capacitance ageing . 37
A.3 Capacitance measurements and capacitance tolerance (see 5.4.1). 38
A.4 Special preconditioning (see 5.2) . 39
Annex B (normative) Temperature characteristics of capacitance of 25 °C . 40
Annex C (normative) Quality conformance inspection . 42
C.1 Formation of inspection lots . 42
C.1.1 Groups A and B inspection . 42
C.1.2 Group C inspection . 42
C.2 Test schedule . 42
C.3 Delayed delivery . 42
C.4 Assessment levels . 42
C.5 Test schedule for quality conformance inspection . 43
Annex X (informative) Comparison of cross-references in relation to IEC 60384-9:2015 . 48
Bibliography . 49

Table 1 – Preferred tolerance on nominal capacitance . 10
Table 2 – Preferred values of temperature characteristics Temperature characteristic
of capacitance . 11
Table 3 – Measuring conditions . 12
Table 4 – Insulation resistance requirements . 13
Table 5 – Test voltages . 14
Table 6 – Details of measuring conditions . 15
Table 7 – Maximum capacitance change . 16
Table 8 – Preferred severities (of non-repetitive shock) . 18
Table 9 – Maximum capacitance change . 19
Table 10 – Number of damp heat cycles . 20
Table 11 – Final inspection measurements and requirements . 21
Table 12 – Test conditions for damp heat, steady state . 22
Table 13 – Final inspection, measurements and requirements . 22
Table 14 – Endurance test conditions . 23
Table 15 – Final inspection, measurements and requirements . 24

Table 16 – Sampling plan together with numbers of permissible non-conforming items
for qualification approval tests, assessment level EZ . 28
Table 17 – Test schedule for qualification approval . 29
Table B.1 – Temperature characteristics of capacitance . 40
Table B.2 – Preferred values of the temperature characteristic of with and without a

DC voltage applied . 41
Table B.3 – Measuring conditions of temperature characteristic of capacitance for the
reference temperature of 25 °C . 41
Table C.1 – Lot-by-lot inspection . 42
Table C.2 – Periodic tests . 43
Table C.3 – Test schedule for quality conformance inspection (lot by lot) . 44
Table C.4 – Test schedule for quality conformance inspection (periodic test) . 45
Table X.1 – Reference to IEC 60384-9:2015 for clauses/subclauses/annexes . 48
Table X.2 – Reference to IEC 60384-9 for figure/table . 48

– 6 – IEC 60384-9:2024 RLV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –

Part 9: Sectional specification –
Fixed capacitors of ceramic dielectric, Class 2

FOREWORD
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60384-9:2015. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
IEC 60384-9 has been prepared by IEC technical committee 40: Capacitors and resistors for
electronic equipment. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2015. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The document has been completely restructured to comply with ISO/IEC Directives, Part 2
and to make it more useable; tables, figures and references have been revised accordingly.
Annex X contains all cross-references of changes in clause/subclause numbers.
b) The requirements of reference temperature 25 °C have been added in Table 7, Table 9,
Table 11, Table 13 and Table 15.
c) The table of temperature characteristics of capacitance for the reference temperature 25 °C
have been added in Table B.1, Table B.2 and Table B.3.
d) Annex B has been changed from informative to normative.
e) Clause C.5 (Test schedule for quality conformance inspection) has been newly added to
withdraw the blank detail specification: IEC 60384-9-1.
The text of this International Standard is based on the following documents:
Draft Report on voting
40/3145/FDIS 40/3162/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60384 series, published under the general title Fixed capacitors for
use in electronic equipment, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 8 – IEC 60384-9:2024 RLV © IEC 2024
FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –

Part 9: Sectional specification –
Fixed capacitors of ceramic dielectric, Class 2

1 General
1.1 Scope
This part of IEC 60384 is applicable to fixed capacitors of ceramic dielectric with a defined
temperature coefficient (dielectric Class 2), intended for use in electronic equipment, including
leadless capacitors but excluding fixed surface mount multilayer capacitors of ceramic dielectric,
which are covered by IEC 60384-22 (Class 2).
Capacitors for electromagnetic interference suppression are not included, but are covered by
IEC 60384-14.
1.2 Object
The object of this document is to prescribe specify preferred ratings and characteristics and to
select from IEC 60384-1:20082021 the appropriate quality assessment procedures, tests and
measuring methods and to give general performance requirements for this type of capacitor.
Test severities and requirements prescribed specified in detail specifications referring to this
sectional specification shall be of equal or higher performance level because lower performance
levels are not permitted this document provide specific test severities and requirements of an
equal or higher performance level. Further information on the conception of generic, sectional
and detail specifications can be found in the Introduction of IEC 60384-1:2021.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 60063:1963, Preferred number series for resistors and capacitors
IEC 60063:1963/AMD1:1967
IEC 60063:1963/AMD2:1977
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60384-1:20082021, Fixed capacitors for use in electronic equipment – Part 1: Generic
specification
IEC 61193-2:2007, Quality assessment systems – Part 2: Selection and use of sampling plans
for inspection of electronic components and packages
ISO 3:1973, Preferred numbers – Series of preferred numbers

3 Terms and definitions
For the purposes of this document, the applicable terms and definitions given in IEC 60384-1
and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
fixed capacitors, capacitor of ceramic dielectric, Class 2
capacitor which has a dielectric with a high permittivity and is suitable for by-pass and coupling
applications or for frequency discriminating circuits where low losses and high stability of
capacitance are not of major importance
Note 1 to entry: The ceramic dielectric is characterized by the non-linear change of capacitance over the category
temperature range (see Table 2).
3.2
subclass
maximum percentage change of capacitance within the category temperature range
with respect to the capacitance at the reference temperature 20 °C or 25 °C
Note 1 to entry: The subclass may be expressed in code form (see Table 2 and Annex B).
3.3
rated voltage
U
R
maximum DC voltage that may can be applied continuously to the terminations of a capacitor
at the rated temperature
Note 1 to entry: Maximum DC voltage is the sum of the DC voltage and peak AC voltage or peak pulse voltage
applied to the capacitor.
[SOURCE: IEC 60384-1:2008, 2.2.25, modified (addition of "the terminations of")]
4 Preferred ratings and characteristics
4.1 Preferred characteristics
Preferred climatic categories only shall be given in the preferred characteristics.
The capacitors covered by this document are classified into climatic categories in accordance
with the general rules given in IEC 60068-1:2013, Annex A.
For a reference temperature of 20 °C, the lower and upper category temperatures and the
duration of the damp heat, steady state test shall be chosen from the following:
− lower category temperature: −55 °C, −40 °C, −25 °C and −10 °C
upper category temperature: +70 °C, +85 °C, +100 °C, +125 °C and +150 °C
−
duration of the damp heat, steady state 4 days, 10 days, 21 days, and 56 days
−
test (40 °C, 93 % RH):
For a refence temperature of 25 °C, the lower and upper category temperatures shall be chosen
from Table B.1 in Annex B.
– 10 – IEC 60384-9:2024 RLV © IEC 2024
The severities for the cold and dry heat tests are the lower and upper category temperatures,
respectively.
4.2 Preferred values of ratings
4.2.1 Rated temperature
For capacitors covered by this document, the rated temperature is equal to the upper category
temperature.
4.2.2 Rated voltage (U )
R
The preferred values of rated voltage are: (25, 40, 63, 100, 160, 250, 400, 630, 1 000, 1 600,
2 500, 4 000 and 6 300) V. These values conform to the basic series of preferred values R5
given in ISO 3. If other values are needed, they shall be chosen from the R10 series. The sum
of the DC voltage and the peak AC voltage or the peak to peak AC voltage, whichever is the
greater, applied to the capacitor shall not exceed the rated voltage.
The sum of the d.c. voltage and the peak a.c. voltage applied to the capacitor should not exceed
the rated voltage. The value of the peak alternating voltage should not exceed the value
determined by the permissible reactive power.
4.2.3 Category voltage (U )
C
Since the rated temperature is defined as the upper category temperature, the category voltage
is equal to the rated voltage, as defined in IEC 60384-1:20082021, 3.5.
4.2.4 Preferred values of nominal capacitance and associated tolerance values
4.2.4.1 Preferred values of nominal capacitance
Nominal capacitance values shall should be taken from the E3, E6 and E12 series given in
IEC 60063 preferably.
4.2.4.2 Preferred tolerances on nominal capacitance
Table 1 denotes the preferred values of tolerance on nominal capacitance.
Table 1 – Preferred tolerance on nominal capacitance
Preferred series Tolerances Letter code
%
E3 and E6 −20/+80 Z
−20/+50 S
E6 ±20 M
E6 and E12 ±10 K
4.2.5 Temperature characteristic of capacitance
Table 2 denotes with a cross the preferred values of temperature characteristics with and
without d.c. voltage applied. The method of coding the subclass is also given; for example a
dielectric with a percentage change of ±20 % without d.c. voltage applied over the temperature
range from -55 °C to +125 °C, will be defined as a dielectric of Class 2C1.
Table 2 shows the temperature characteristic with and without DC voltage applied for the
reference temperature 20 °C. The method of coding the subclass is also given; for example, a

dielectric with a percentage change of ±20 % without DC voltage applied over the temperature
range from −55 °C to +125 °C, will be defined as a dielectric of Class 2C1. The temperature
characteristics, category temperatures and corresponding codes for the reference temperature
25 °C are given in Annex B.
The temperature range, for which the temperature characteristics of the dielectric is defined, is
the same as the category temperature range.
Table 2 – Preferred values of temperature characteristics Temperature characteristic of
capacitance
Maximum capacitance change within Category temperature range and
the category temperature range with corresponding number code
respect to the capacitance at 20 °C
Sub-
measured with and without a DC voltage
−55/+150 −55/+125 −55/+85 −40/+85 −25/+85 +10/+85
class
applied
letter
°C °C °C °C °C °C
code %
with DC voltage
without DC
0 1 2 3 4 6
a
voltage applied
applied
2B ±10 - x x x -
2C ±20 x x x - -
Requirements specified
2D +20/−30 - - - x -
in
2E +22/−56 - x x x x
the detail specification
2F +30/−80 - x x x x
2R ±15 x - - - -
2X ±15 +15/–25 x - - - -
When the upper category temperature is above 125 °C, the limits of capacitance change, both with and without DC
voltage applied, should be given in the detail specification.
a
DC voltage applied is either rated voltage or the voltage specified in the detail specification.
NOTE Annex B can be referred to for preferred values of the temperature characteristics for the reference
temperature 25 °C.
5 Test and measurement procedures
5.1 General
This Clause 5 supplements the information given in IEC 60384-1:20082021, Clause 45 to
Clause 10.
5.2 Special preconditioning
Unless otherwise specified in the detail specification, the special preconditioning, when
specified in this document before a test or a sequence of tests, shall be carried out under the
following conditions: exposure at upper category temperature or at such higher temperature as
may be specified in the detail specification for a period of 1 h, followed by recovery for a period
of 24 h ± 1 h at standard atmospheric conditions for testing.
NOTE Class 2 capacitors lose capacitance continuously with time following a logarithmic law (this is called ageing).
However if the capacitor is heated to a temperature above the Curie point of its dielectric then "de-ageing" takes
place, i.e. the capacitance lost through "ageing" is regained, and "ageing" recommences from the time when the
capacitor recools.
The purpose of special preconditioning is to bring the capacitor to a defined stage regardless of its previous history
(see Clause A.4 for further information).

– 12 – IEC 60384-9:2024 RLV © IEC 2024
5.3 Visual examination and check of dimensions
See IEC 60384-1:2008,2021, 7.1.
5.4 Electrical tests
5.4.1 Capacitance
5.4.1.1 General
See IEC 60384-1:20082021, 6.3, with the details of 5.4.1.2 and 5.4.1.3.
5.4.1.2 Measuring conditions
The capacitance shall be measured in accordance with Table 3 and in accordance with the
details given below Table 3.
Table 3 – Measuring conditions
a
Reference temperature Subclass Measuring voltage
Referee voltage
2B, 2C, 2X 1,0 ± 0,2 V 1,0 ± 0,02 V
0,3 ± 0,2 V 0,3 ± 0,02 V
20 °C
2D, 2E, 2F, 2R
or as specified in the detail or as specified in the detail
specification specification
25 °C R,S,T,U 1,0 ± 0,2 V 1,0 ± 0,02 V
a
In case of dispute about results of measurements, referee voltage is applied.

Frequency: C < 100 pF f = 1 MHz unless otherwise specified in the detail specification.
N
C ≥ 100 pF f = 1 kHz ± 20 % for measuring purposes and 1 kHz for referee tests.
N
C > 10 μF f = 100 Hz or 120 Hz ± 20 % with measuring voltage 0,5 V ± 0,2 V
N
for measuring purposes and 100 Hz or 120 Hz for referee tests.
5.4.1.3 Requirements
The capacitance value shall correspond with the rated value taking into account the specified
tolerance.
For referee measurements the capacitance value shall be the value extrapolated to an ageing
time of 1 000 h, unless otherwise specified in the detail specification (for explanation see
Annex A).
If applying the ageing time other than 1 000 h, that may be specified in the detail specification.
5.4.2 Tangent of loss angle (tan δ)
5.4.2.1 General
See IEC 60384-1:20082021, 6.4, with the details of 5.4.2.2 to 5.4.2.4.
5.4.2.2 Measuring conditions
See 5.4.1.
5.4.2.3 Accuracy
The accuracy of the measuring instruments shall be such that the measuring error does not
exceed 0,001.
5.4.2.4 Requirements
The tangent of loss angle shall not exceed 0,035, or such lower value as may be given in the
detail specification.
5.4.3 Insulation resistance (R )
i
5.4.3.1 General
See IEC 60384-1:20082021, 6.1, with the details of 5.4.3.2 and 5.4.3.3.
5.4.3.2 Measuring conditions
See IEC 60384-1:20082021, 6.1.2, with the following details:
For U < 100 V, the measuring voltage may be of any value not greater than U , the reference
R R
voltage being U .
R
The voltage shall be applied immediately at the specified value for 1 min ± 5 s for qualification
approval testing and periodic tests (Group C). For lot-by-lot testing (Group A), the test may be
terminated in a shorter time, if the required value of insulation resistance is reached.
The product of the internal resistance of the voltage source and the nominal capacitance of the
capacitor shall not exceed 1 s unless otherwise prescribed specified in the detail specification.
The charge current shall not exceed 0,05 A.
The insulation resistance (R ) shall be measured at the end of the 1 min period.
i
5.4.3.3 Requirements
The insulation resistance (R ) shall meet the requirements given in Table 4.
i
Table 4 – Insulation resistance requirements
Style Measuring points C ≤ 25 nF C > 25 nF
N N
R R × C
i i N
Insulated 1a and 1c
≥ 4 000 MΩ ≥ 100 s
Non-insulated 1a
5.4.4 Voltage proof
5.4.4.1 General
See IEC 60384-1:20082021, 6.2, with the details of 5.4.4.2 to 5.4.4.4.
5.4.4.2 Test conditions
The product of R and the nominal capacitance C shall be smaller than or equal to 1 s.
i x
– 14 – IEC 60384-9:2024 RLV © IEC 2024
The charge current shall not exceed 0,05 A.
5.4.4.3 Test voltage
The voltages in Table 5 shall be applied between the measuring points of
IEC 60384-1:20082021, Table 3, for a period of 1 min for qualification approval testing and for
a period of 1 s for the lot-by-lot quality conformance testing.
Table 5 – Test voltages
Type Rated voltage Test voltage
V V
Leaded multilayer ceramic  U ≤ 100 2,5 U
R R
capacitors
100 < U ≤ 200 1,5 U + 100
R R
200 < U ≤ 500 1,3 U + 100
R R
500 < U  1,3 U
R R
Others  U ≤ 500 2,5 U
R R
U > 500 1,5 U + 500
R R
NOTE If U > 500 V, then the test voltage for Test C (external insulation) is 1,5 U + 500 V or as specified in the
R R
detail specification.
5.4.4.4 Requirement
There shall be no breakdown or flashover during the test.
5.5 Temperature characteristic of capacitance (reference temperature 20 °C)
5.5.1 Special preconditioning
See 5.2.
5.5.2 Measuring conditions
See IEC 60384-1:20082021, 6.8.1.2 and 6.8.1.3, with Table 6.
The measuring steps and conditions for a reference temperature 25 °C are given in Annex B.

Table 6 – Details of measuring conditions
Measuring step Temperature DC voltage applied
°C
1 20 ± 2 -
a
2 -
T ± 3
A
3 20 ± 2 -
b
4 -
T ± 2
B
5 T ± 2 x
B
6 20 ± 2 x
7 T ± 3 x
A
8 20 ± 2 -
NOTE "-" indicates: no DC voltage applied.
"x" indicates: DC voltage applied (if specified in the detail specification)
NOTE 2 Intermediate measurement temperatures are used when ensuring the requirements of 4.2.5.
NOTE 3 Reference capacitance is the capacitance measured at Step 3.
NOTE 4 Because of the effects described in the Note in 5.2, the capacitance values measured at temperature
reference, Steps 5 to 7, with DC voltage applied, are time dependent. This time dependency is included in the
given limits for capacitance change. The capacitance change between the first and the last measurements at
temperature reference, Steps 1 and 8, indicates the amount of ageing involved. In case of a dispute about the
results of measurements with DC voltage applied, it is advisable to agree upon a fixed time interval between
measurements at temperature reference, Steps 5 and 7 with DC voltage applied (see IEC 60384-1:20082021,
6.8.1.3).
a
T = Lower category temperature.
A
b
T = Upper category temperature.
B
5.5.3 Requirements
The variation of capacitance shall be calculated in accordance with IEC 60384-1:20082021,
6.8.3.1.
The temperature characteristics with and without DC voltage applied shall not exceed the values
given in Table 2.
5.6 Robustn
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