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

General Information

Status
Published
Publication Date
06-Jul-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
19-May-2021
Completion Date
19-May-2021
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ISO/TS 23521:2021 - Road vehicles -- Calibration procedure for displacement devices
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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/TS 23521:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO/TS 23521:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
---------------------- Page: 2 ----------------------
ISO/TS 23521:2021(E)
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

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/TS 23521:2021(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 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
---------------------- Page: 4 ----------------------
ISO/TS 23521:2021(E)
Introduction

This document was written to address the need of the automotive crash testing community for a well-

defined calibration method of displacement sensors.
© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
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
Road vehicles — Calibration
procedure for displacement devices
Véhicules routiers — Procédés de calibration pour les dispositifs de
déplacement
PROOF/ÉPREUVE
Reference number
ISO/TS 23521:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO/TS 23521:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© 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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/TS 23521:2021(E)
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

© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO/TS 23521:2021(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 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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/TS 23521:2021(E)
Introduction

This document was written to address the need of the automotive crash testing community for a well-

defined calibration method of displacement sensors.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE v
---------------------- Page: 5 ----------------------
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 and IEC maintain
...

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