主要变更:
a.
增补新的频段,
b.
删除 附录中TEM单元,
c.
增补附录中测量不确定度,
d.
整体改善 
This Final Draft International Standard is an up to 6 weeks' pre-release
of the official publication. It is available for sale during its voting period:
2021-10-15 to 2021-11-26. By purchasing this FDIS now, you will automatically
receive, in addition, the final publication.
CISPR 25:2021 contains limits and procedures for
the measurement of radio disturbances in the frequency range of 150 kHz to 5
925 MHz. This document applies to vehicles, boats, internal combustion engines,
trailers, devices and any electronic/electrical component intended for use in
vehicles, boats, trailers and devices. Refer to International
Telecommunications Union (ITU) publications for details of frequency
allocations. The limits are intended to provide protection for on-board receivers
installed (per the manufacturer’s guidelines) in a vehicle from disturbances
produced by components/modules in the same vehicle. The receiver types to be
protected are, for example, broadcast receivers (sound and television), land
mobile radio, radio telephone, amateur, citizens' radio, Satellite Navigation
(GPS etc.), Wi-Fi, V2X, and Bluetooth. This document does not
include protection of electronic control systems from radio frequency (RF)
emissions or from transient or pulse-type voltage fluctuations. These subjects
are included in ISO publications. The limits in this document are recommended
and subject to modification as agreed between the customer (e.g. vehicle
manufacturer) and the supplier (e.g. component manufacturer). This document is
also intended to be applied by vehicle manufacturers and suppliers which are to
be added and connected to the vehicle harness or to an on-board power connector
after delivery of the vehicle. This document defines test methods for use by
vehicle manufacturers and suppliers, to assist in the design of vehicles and
components and ensure controlled levels of on-board radio frequency emissions.
The emission requirements in this document are not intended to be applicable to
the intentional transmissions from a radio transmitter as defined by the ITU
including their spurious emissions.
NOTE 1 This exclusion is limited to those
intended transmitter emissions, which leave the EUT as radiated emissions and
are coupled onto the wire line in the measurement setup. For conducted
transmissions on frequencies intentionally produced by the radio part of an
EUT, this exclusion does not apply.
NOTE 2 It is usual for customers and suppliers to
use radio regulation standards to manage the effect of spurious emissions from
a radio transmitter unless limits of spurious emission are agreed in the test
plan.
This fifth edition cancels and replaces the
fourth edition published in 2016. This edition constitutes a technical
revision. This edition includes the following significant technical changes
with respect to the previous edition:
a.
inclusion of new frequency bands,
b.
deletion of the annex on TEM cells,
c.
inclusion of annexes on measurement uncertainty,
d.
overall improvement.
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