IEC 60068-3-3
Edition 2.0 2019-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-3: Supporting documentation and guidance – Seismic test methods for
equipment
Essais d’environnement –
Partie 3-3: Documentation d’accompagnement et recommandations – Méthodes
d’essais sismiques applicables aux matériels
IEC 60068-3-3:2019-08(en-fr)
®
IEC 60068-3-3
Edition 2.0 2019-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-3: Supporting documentation and guidance – Seismic test methods for
equipment
Essais d’environnement –
Partie 3-3: Documentation d’accompagnement et recommandations – Méthodes
d’essais sismiques applicables aux matériels
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040
ISBN 978-2-8322-7097-4
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
®
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
– 2 – IEC 60068-3-3:2019 © IEC 2019
CONTENTS
FOREWORD ........................................................................................................................... 5
INTRODUCTION ..................................................................................................................... 7
1 Scope .............................................................................................................................. 8
2 Normative references ...................................................................................................... 8
3 Terms and definitions ...................................................................................................... 9
4 General and qualification considerations ....................................................................... 14
4.1 General seismic class and specific seismic class .................................................. 14
4.2 Service conditions ................................................................................................. 14
4.3 Malfunction criteria ............................................................................................... 15
4.4 Qualification criteria .............................................................................................. 15
5 Testing procedures ........................................................................................................ 15
5.1 General ................................................................................................................. 15
5.2 Mounting ............................................................................................................... 15
5.3 Measurements ...................................................................................................... 15
5.3.1 Vibration measurements at the vibration table ............................................... 15
5.3.2 Vibration measurements on the equipment .................................................... 16
5.3.3 Functional monitoring of the equipment ......................................................... 16
5.4 Frequency range ................................................................................................... 16
6 Conditioning .................................................................................................................. 16
7 Test wave selection ....................................................................................................... 16
7.1 General ................................................................................................................. 16
7.2 Multifrequency waves............................................................................................ 16
7.3 Single-frequency waves ........................................................................................ 17
8 Test waves .................................................................................................................... 17
8.1 General ................................................................................................................. 17
8.1.1 Specification of test waves ............................................................................ 17
8.1.2 Simulation with a safety margin of the effects of an earthquake ..................... 17
8.2 Multifrequency wave testing .................................................................................. 18
8.2.1 General requirements .................................................................................... 18
8.2.2 Time-history test ............................................................................................ 18
8.2.3 Other multifrequency tests ............................................................................. 18
8.3 Single-frequency testing ....................................................................................... 19
8.3.1 General requirements .................................................................................... 19
8.3.2 Sine-sweep test ............................................................................................. 19
8.3.3 Sine-beat test ................................................................................................ 19
8.3.4 Continuous sine test ...................................................................................... 20
8.4 Other test wave forms ........................................................................................... 20
9 Testing conditions ......................................................................................................... 20
9.1 General ................................................................................................................. 20
9.2 Vibration response investigation ........................................................................... 21
9.3 Test methods ........................................................................................................ 21
9.3.1 Test method for equipment without critical frequencies .................................. 21
9.3.2 Test method for equipment with critical frequencies ....................................... 22
9.4 Selection of damping ............................................................................................ 22
9.5 S1-earthquake and S2-earthquake testing ............................................................ 23
IEC 60068-3-3:2019 © IEC 2019 – 3 –
9.6
Specific application testing .................................................................................... 23
9.7 Assembly testing ................................................................................................... 23
9.8 Component testing ................................................................................................ 23
10 Single and multi-axis testing .......................................................................................... 24
10.1 General ................................................................................................................. 24
10.2 Single-axis testing ................................................................................................ 24
10.3 Biaxial testing ....................................................................................................... 24
10.3.1 General requirements .................................................................................... 24
10.3.2 Two horizontal axes ....................................................................................... 24
10.3.3 One horizontal axis and one vertical axis ....................................................... 24
10.4 Triaxial testing ...................................................................................................... 25
10.4.1 General ......................................................................................................... 25
10.4.2 Triaxial installation ......................................................................................... 25
10.4.3 Biaxial installation (one horizontal axis, one vertical axis) .............................. 26
11 Conditioning for the general seismic class ..................................................................... 26
11.1 Selection of test type ............................................................................................ 26
11.2 Test method .......................................................................................................... 26
12 Calculated amplitude test method for the general seismic class ..................................... 27
12.1 Application ............................................................................................................ 27
12.2 Testing conditions ................................................................................................. 27
12.2.1 General ......................................................................................................... 27
12.2.2 Performance level .......................................................................................... 27
12.2.3 Test wave selection ....................................................................................... 27
12.2.4 Damping ratio ................................................................................................ 27
12.2.5 Ground acceleration (a
g
) ............................................................................... 27
12.2.6 Superelevation factor (K) ............................................................................... 29
12.2.7 Direction factor (D) ........................................................................................ 29
12.2.8 Floor acceleration (a
f
) .................................................................................... 30
13 Testing parameters for the general seismic class .......................................................... 30
13.1 Duration of test ..................................................................................................... 30
13.2 Test acceleration (a
t
) ............................................................................................ 30
13.2.1 General ......................................................................................................... 30
13.2.2 Wave factor (α) .............................................................................................. 31
13.2.3 Geometric factor (G) ...................................................................................... 31
14 Required response spectrum for the general seismic class ............................................ 31
15 Testing procedures for the general seismic class ........................................................... 32
15.1 Vibration response investigation (VRI) .................................................................. 32
15.2 Types of test ......................................................................................................... 33
15.2.1 Sine-beat test ................................................................................................ 33
15.2.2 Sine-sweep test ............................................................................................. 33
15.2.3 Time-history test ............................................................................................ 33
15.2.4 Other test wave forms .................................................................................... 33
16 Conditioning for the specific seismic class ..................................................................... 33
17 Test wave selection for the specific seismic class .......................................................... 34
17.1 General ................................................................................................................. 34
17.2 Multifrequency waves............................................................................................ 34
17.3 Single-frequency waves ........................................................................................ 34
18 Test waves for the specific seismic class ....................................................................... 34
– 4 – IEC 60068-3-3:2019 © IEC 2019
18.1
General ................................................................................................................. 34
18.2 Single-frequency testing ....................................................................................... 34
18.2.1 General ......................................................................................................... 34
18.2.2 Sine-sweep test ............................................................................................. 34
18.2.3 Sine-beat test ................................................................................................ 34
18.2.4 Continuous sine test ...................................................................................... 35
18.3 Other test wave forms ........................................................................................... 35
19 Testing conditions for the specific seismic class ............................................................ 35
20 Single and multi-axis testing for the specific seismic class ............................................. 35
Annex A (informative) Flow charts for test selection ............................................................. 43
A.1 Selection of test type ............................................................................................ 43
A.2 General seismic class – Calculated amplitude test ................................................ 44
A.3 Specific seismic class – Single axis testing ........................................................... 45
A.4 Specific seismic class – Multi-axis testing ............................................................. 46
Bibliography .......................................................................................................................... 47
Figure 1 – Shape of a required response spectrum in generalized form (log-log scale)
(as recommended by IEC 60068-2-57) .................................................................................. 32
Figure 2 – Typical envelope response spectrum .................................................................... 35
Figure 3 – Types of response spectrum envelopes ................................................................ 36
Figure 4 – Multifrequency response spectrum with superimposed sine beats ........................ 37
Figure 5 – Sequence of five sine beats with five cycles ......................................................... 37
Figure 6 – Typical time history .............................................................................................. 38
Figure 7 – Continuous sine ................................................................................................... 39
Figure 8 – Biaxial table along an inclined plane .................................................................... 40
Figure 9 – Wave amplification factors ................................................................................... 41
Figure 10 – Vibration amplitudes for ground acceleration a
g
with crossover frequencies
at 0,8 Hz and 1,6 Hz ............................................................................................................. 42
Figure A.1 – Selection of seismic class ................................................................................. 43
Figure A.2 – Calculated amplitude test flowchart ................................................................... 44
Figure A.3 – Single-axis testing flowchart ............................................................................. 45
Figure A.4 – Multi-axis testing flowchart ................................................................................ 46
Table 1 – Typical damping ratios (per cent of critical) ........................................................... 22
Table 2 – Selection of test type ............................................................................................. 26
Table 3 – Ground acceleration levels .................................................................................... 27
Table 4 – Correspondence between peak ground acceleration and some seismic
scales ................................................................................................................................... 28
Table 5 – Recommended superelevation factors (K) ............................................................. 29
Table 6 – Direction factors (D) .............................................................................................. 29
Table 7 – Wave factor ........................................................................................................... 31
