ISO/TS 23521:2021
(Main)Road vehicles — Calibration procedure for displacement devices
Road vehicles — Calibration procedure for displacement devices
This document establishes a procedure to calibrate 1D displacement transducers with nearly linear transfer functions. This procedure is tailored to the needs of sensors used in crash tests. The calibration is carried out with the sensor disassembled from the dummy or test system. The procedure is valid for sensors with analogue as well as digital output.
Véhicules routiers — Procédés de calibration pour les dispositifs de déplacement
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TECHNICAL ISO/TS
SPECIFICATION 23521
First edition
2021-07
Road vehicles — Calibration
procedure for displacement devices
Véhicules routiers — Procédés de calibration pour les dispositifs de
déplacement
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Displacement calibration procedure . 1
4.1 General . 1
4.2 Preparations . 1
4.3 Test equipment set up . 1
4.4 Establish starting point . 2
4.5 Displacement calibration data collection . 2
5 Calibration data processing . 2
5.1 General . 2
5.2 ISO 6487 definition . 2
5.3 SAE 2570 definition . 3
Annex A (informative) Example: Knee-slider (FS: 35 mm) . 4
Bibliography . 6
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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 36,
Safety and impact testing.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
Introduction
This document was written to address the need of the automotive crash testing community for a well-
defined calibration method of displacement sensors.
TECHNICAL SPECIFICATION ISO/TS 23521:2021(E)
Road vehicles — Calibration procedure for displacement
devices
1 Scope
This document establishes a procedure to calibrate 1D displacement transducers with nearly linear
transfer functions. This procedure is tailored to the needs of sensors used in crash tests. The calibration
is carried out with the sensor disassembled from the dummy or test system. The procedure is valid for
sensors with analogue as well as digital output.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO
...
TECHNICAL ISO/TS
SPECIFICATION 23521
First edition
2021-07
Road vehicles — Calibration
procedure for displacement devices
Véhicules routiers — Procédés de calibration pour les dispositifs de
déplacement
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Displacement calibration procedure . 1
4.1 General . 1
4.2 Preparations . 1
4.3 Test equipment set up . 1
4.4 Establish starting point . 2
4.5 Displacement calibration data collection . 2
5 Calibration data processing . 2
5.1 General . 2
5.2 ISO 6487 definition . 2
5.3 SAE 2570 definition . 3
Annex A (informative) Example: Knee-slider (FS: 35 mm) . 4
Bibliography . 6
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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 36,
Safety and impact testing.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
Introduction
This document was written to address the need of the automotive crash testing community for a well-
defined calibration method of displacement sensors.
TECHNICAL SPECIFICATION ISO/TS 23521:2021(E)
Road vehicles — Calibration procedure for displacement
devices
1 Scope
This document establishes a procedure to calibrate 1D displacement transducers with nearly linear
transfer functions. This procedure is tailored to the needs of sensors used in crash tests. The calibration
is carried out with the sensor disassembled from the dummy or test system. The procedure is valid for
sensors with analogue as well as digital output.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO
...
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