Quasi-static calibration procedure for belt force transducers

ISO/TS 17242:2014 provides a procedure to calibrate seat belt force transducers with loading capacities up to 25 kN and consistent test specifications and sequences in order to improve comparability of measurement results between testing laboratories.

Procédure d’étalonnage quasi-statique pour capteurs d’efforts pour ceintures

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Status
Published
Publication Date
28-Apr-2014
Current Stage
9060 - Close of review
Start Date
05-Mar-2021
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ISO/TS 17242:2014 - Quasi-static calibration procedure for belt force transducers
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TECHNICAL ISO/TS
SPECIFICATION 17242
First edition
2014-05-01
Quasi-static calibration procedure for
belt force transducers
Procédure d’étalonnage quasi-statique pour capteurs d’efforts pour
ceintures
Reference number
ISO/TS 17242:2014(E)
ISO 2014
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ISO/TS 17242:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
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ISO/TS 17242:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 General specifications ..................................................................................................................................................................................... 2

3.1 General ........................................................................................................................................................................................................... 2

3.2 Limitations or the application of the test belt strap ............................................................................................... 2

4 Test conditions ....................................................................................................................................................................................................... 3

4.1 Test method ............................................................................................................................................................................................... 3

4.2 Clamping length ..................................................................................................................................................................................... 3

4.3 Test velocity ............................................................................................................................................................................................... 3

4.4 Belt strap ...................................................................................................................................................................................................... 3

4.5 Load relieving .......................................................................................................................................................................................... 3

4.6 Data acquisition ..................................................................................................................................................................................... 3

4.7 Data evaluation ....................................................................................................................................................................................... 3

4.8 Sensor excitation ................................................................................................................................................................................... 4

4.9 Environmental conditions ............................................................................................................................................................. 4

5 Calibration procedure ..................................................................................................................................................................................... 4

5.1 Conditioning .............................................................................................................................................................................................. 4

5.2 Test preparation ..................................................................................................................................................................................... 4

5.3 Calibration test ........................................................................................................................................................................................ 4

5.4 Data storage ............................................................................................................................................................................................... 4

5.5 Data evaluation ....................................................................................................................................................................................... 4

5.6 Documentation ....................................................................................................................................................................................... 5

Annex A (normative) Test setup ................................................................................................................................................................................ 6

Annex B (normative) Evaluation method ........................................................................................................................................................ 7

Annex C (informative) Belt strap characteristics .................................................................................................................................10

Annex D (informative) Applications notes ..................................................................................................................................................12

© ISO 2014 – All rights reserved iii
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ISO/TS 17242:2014(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 12, Passive

safety crash protection systems.
iv © ISO 2014 – All rights reserved
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TECHNICAL SPECIFICATION ISO/TS 17242:2014(E)
Quasi-static calibration procedure for belt force
transducers
1 Scope

The objective of this Technical Specification is to provide a procedure to calibrate seat belt force

transducers with loading capacities up to 25 kN and consistent test specifications and sequences in

order to improve comparability of measurement results between testing laboratories.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial

testing machines
ISO 5084, Textiles — Determination of thickness of textiles and textile products

ISO 6487, Road vehicles — Measurement techniques in impact tests — Instrumentation

ISO 13499, Road vehicles — Multimedia data exchange format for impact tests

ECE-R16, Safety-belts, restraint systems, child restraint systems and ISOFIX child restraint systems for

occupants of power-driven vehicles
SAE-J2517, Hybrid III Family Chest Potentiometer Calibration Procedure
© ISO 2014 – All rights reserved 1
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ISO/TS 17242:2014(E)
3 General specifications
3.1 General

The described measurement procedure refers to belt force transducers with the specifications according

to Table 1 and a loading capacity of up to 25 kN.
Table 1 — Design categorization of belt force transducers
Type Description Belt Orientation
1 Baffle
(test belt strap according to Annex 3)
2 Loop
(test belt strap according to customer requirement)
3 Clamping
(test belt strap according to customer requirement)
4 3-Bolt
(test belt strap according to customer requirement)
3.2 Limitations or the application of the test belt strap

In general, the standardized calibration belt strap (see C.1) is only recommended for the calibration of

belt force transducers which are to be utilized in tests that focuses on comparability between different

laboratories (such as during development efforts). In case absolute values have to be obtained, the seat

belt webbing designated for subsequent testing purposes is to be used for calibration.

Calibration using the standardized calibration belt strap shall be done for highly dynamically loaded

transducers as shown in Type 1 (baffle). Consequently Types 2, 3, 4, and Type 1 transducers for quasi-

static loads and measurement ranges up to 500 N (i.e. comfort measurements) are to be excluded.

NOTE If required (e.g. by the user or the test protocol), Type 1 transducers with measurement ranges beyond

500 N should be calibrated with a specimen of the seat belt webbing which is designated for subsequent testing

purposes. For the calibration of Types 2, 3, 4, and Type 1 transducers for quasi-static loads and measurement

ranges below 500 N, a specimen of the seat belt webbing which is designated for subsequent testing purposes will

be necessary.

1) Measurement of absolute values shows significant variation for type 1 transducers. A different measurement

principle is recommended.
2 © ISO 2014 – All rights reserved
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ISO/TS 17242:2014(E)

The belt strap type used for calibration as well as the strap’s average thickness (see Annex C) shall be

identified in the calibration report.
If a no
...

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