ISO 16750-2:2023

INTERNATIONAL ISO
STANDARD 16750-2
Fifth edition
2023-07
Road vehicles — Environmental
conditions and testing for electrical
and electronic equipment —
Part 2:
Electrical loads
Véhicules routiers — Spécifications d'environnement et essais de
l'équipement électrique et électronique —
Partie 2: Contraintes électriques
Reference number
© ISO 2023
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Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test and requirements .2
4.1 General . 2
4.2 Direct current (DC) supply voltage . 2
4.2.1 Purpose . 2
4.2.2 Test method . 2
4.2.3 Requirements . 4
4.3 Overvoltage . 4
4.3.1 Long term overvoltage . 4
4.3.2 Transient overvoltage . 6
4.4 Superimposed alternating voltage . 7
4.4.1 Purpose . 7
4.4.2 Test method . 7
4.4.3 Requirements . 10
4.5 Slow decrease and increase of supply voltage . 10
4.5.1 Purpose . 10
4.5.2 Test method . 10
4.5.3 Requirements . 11
4.6 Discontinuities in supply voltage . 11
4.6.1 Drops or interrupts in supply voltage . 11
4.6.2 Reset behaviour at voltage drop . 16
4.6.3 Starting profile . 17
4.6.4 Load dump . 19
4.7 Reversed voltage .22
4.7.1 Purpose .22
4.7.2 Test method . 22
4.7.3 Requirements . 24
4.8 Ground reference and supply offset. 24
4.8.1 Purpose . 24
4.8.2 Test method . 25
4.8.3 Requirements . 26
4.9 Open circuit tests . 26
4.9.1 Single line interruption . 26
4.9.2 Multiple line interruption . .28
4.10 Short circuit/overload protection .28
4.10.1 Purpose .28
4.10.2 Short circuit in signal lines and load circuits .28
4.10.3 Overloading of load circuits .29
4.11 Withstand voltage .30
4.11.1 Purpose .30
4.11.2 Test method . 30
4.11.3 Requirements . 30
4.12 Insulation resistance. 31
4.12.1 Purpose . 31
4.12.2 Test method . 31
4.12.3 Requirements . 31
4.13 Electromagnetic compatibility. 31
5 Documentation .31
Annex A (normative) Test load dump pulse generator verification procedure .32
iii
Annex B (informative) Origin of load dump pulse in road vehicles electrical systems .33
Bibliography .34
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Foreword
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electrotechnical standardization.
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
This fifth edition cancels and replaces the fourth edition (ISO 16750-2:2012), which has been technically
revised.
The main changes are as follows:
— introduction of use of operating mode for the electrical tests;
— introduction of concept with redundant supplies for relevant test cases;
— more detailed specification of direct current supply voltage test;
— more detailed specification of jump start test (overvoltage test at RT);
— introduction of transient overvoltage test;
— complete update of superimposed alternating voltage test (e.g. updated test method, extension of
frequency range to 200 kHz, etc.);
— more detailed specification of slow decrease and increase of supply voltage test;
— introduction of micro interruption in supply voltage test;
— more detailed specification of reset behaviour at voltage drop test;
— explanation of severity levels in starting profile test;
— more detailed specification of reversed voltage test;
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