***Update: The standard discussed in this blog post has been revised. The current edition, CISPR 25 Ed. 5.0 b:2021 – Vehicles, Boats And Internal Combustion Engines – Radio Disturbance Characteristics – Limits And Methods Of Measurement For The Protection Of On-Board Receivers, is available on the ANSI Webstore.
CISPR 25 Ed. 4.0 b cor.1:2017, a corrigendum to CISPR 25 Ed. 4.0 b:2016 – Vehicles, boats and internal combustion engines – Radio disturbance characteristics – Limits and methods of measurement for the protection of on-board receivers, has been released. CISPR 25 Ed. 4.0 b cor.1:2017, like other corrigenda, is a document that corrects editorial errors, technical errors, or ambiguities in the international standard.
The CISPR 25 Ed. 4.0 b:2016 standard was designed to protect on-board receivers from disturbances produced by conducted and radiated emissions arising in a vehicle, being applicable to any electronic/electrical component used in vehicles, trailers, and devices. It assures this protection by providing test procedures and limits for measuring radio disturbances within the 150 kHz to 2,500 MHz frequency range.
For the purposes of CISPR 25 Ed. 4.0 b:2016, a vehicle is a machine self-propelled by means of an internal combustion engine, electric means, or both, meaning that it includes but is not limited to passenger cars, trucks, agricultural tractors, and snowmobiles. The standard is applicable to boats as well. The protected receiver types include broadcast receivers and mobile radio, radio telephone, amateur, citizens’ radio, satellite navigation, Wi-Fi, and Bluetooth, among others.
Specifically, CISPR 25 Ed. 4.0 b:2016 establishes a test method and sets limits for measuring electromagnetic emissions from the electrical system of a vehicle, as well as limits for electromagnetic emissions from components that could cause objectionable disturbance to on-board receivers. It also includes test methods for on-board components and modules independent from the vehicle and classifies automotive components by disturbance duration to set a range of limits.
When CISPR 25 Ed. 4.0 b:2016 was published in 2016, it revised and superseded the third edition of the international standard, which was released back in 2008. Major changes to the fourth edition included the inclusion of charging mode for electric vehicles and plug-in electric vehicles, methods for chamber validation, and test methods for shielded power supply systems for high voltages for electric and hybrid electric vehicles.
CISPR 25 Ed. 4.0 b:2016 is still current, but the CISPR 25 Ed. 4.0 b cor.1:2017 corrigendum replaces it within several sections. It does this by updating the following figures:
- Figure 3 – Vehicle-radiated emissions – Example for test layout (end view with monopole antenna)
- The figure labeled “Front view” in Figure 6 – Vehicle-radiated emissions – Example for test layout (end view with monopole antenna)
- Figure I.12 – Example of test setup for conducted emissions – Current probe method – Measurement on LV ports with injection on HV supply ports
Furthermore, the existing frequency range of 3G / IMT-2000 “2 180 to 2 172” is now ” 2 108 to 2 172″. This has led to the replacement of text throughout multiple tables within CISPR Ed. 4.0, as listed in the CISPR 25 Ed. 4.0 b cor.1:2017 document.
