ISO/TS 17242:2014

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 2014
© ISO 2014
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ii © ISO 2014 – All rights reserved

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
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).
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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

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
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
1)
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

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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