GM WORLDWIDE ENGINEERING STANDARDS
© Copyright 2012 General Motors Company All Rights Reserved
3.3 Emissions. This section deals specifically with the unintentional radio frequency (RF) emissions of a DUT.
For these emissions, both radiated emissions (RE) and conducted emissions (CE) via an artificial network (AN)
metrics apply.
Additionally, limits are also placed on the near-field magnetic fields of certain types of DUTs. The unintentional
emissions of a DUT can be in the form of low-frequency (LF) magnetic fields that can adversely impact the LF
operation of the PEPS subsystem. This requirement applies only to those modules or components which are
located in the passenger compartment and that can be placed in close proximity to cup holders, storage
compartments, the glove box, etc., where key fobs for the PEPS subsystem may be placed by the driver. This
requirement does not apply to those devices which utilize a full metallic enclosure.
With respect to the RE and CE via AN measurements and limits, the following statements apply:
Noise is divided into three different types:
1. Non-spark generated noise: Noise generated by electronic sources, such as microprocessors, clocks,
PWM, etc.
2. Combination of non-spark and spark generated noise. This noise contains contributions from a PWM
driving a motor and motor brush noise.
3. Spark generated noise: Noise generated by sparks, such as ignition systems, short and long duration
brush type motors, etc. For the purpose of this standard, short-duration brush type motors are defined
as those motors that cannot operate continuously while driving the vehicle. Examples include window
motors, seat adjustment motors, mirror motors, secondary air pumps, load-leveling compressors, etc.
Long (continuous) duration brush type motors are defined as those motors that can operate
continuously while driving the vehicle. Examples include engine cooling fans, wipers, fuel pumps, and
HVAC blower motors.
The radiated emissions requirements comprise (2) parts:
1. A complete coverage requirement for the 30 MHz to 1000 MHz band, derived from the European EMC
regulatory requirements of 72/245/EEC and ECE Regulation 10 for electronic sub-assemblies;
2. A more restrictive set of requirements for individual onboard receiver bands, based on specific
customer requirements.
For the onboard receiver bands, there is an additional 1% guard band included in the table values for
those receiver bands between 30 MHz and 240 MHz. This is to be able to establish risk of emissions
“drift”. Emissions that exist within this 1% guard band are to be included in the final report.
Emissions may be captured in the individual receiver bands or from 530 kHz to 2351 MHz, or in any other
appropriate number of sub bands.
The Non-Spark requirements of both Table 4 and Table 7 are applicable to the following Categories: A,
AS, AM, EM, AX, AX with EM, AX with BM (as a complete subsystem, for both Continuous and Short-
Duration).
The Spark requirements of both Table 5 and Table 8 are applicable to the following Categories: BM
(Continuous), AX with BM (as a complete subsystem for Continuous).
The Spark requirements of both Table 6 and Table 8 are applicable to the following Categories: BM (Short-
Duration), AX with BM (as a complete subsystem for Short-Duration).
Note: Motors, such as door lock motors and trunk actuators (which typically are energized for less than
1 second and are activated by the driver/occupant) are exempt from the radiated and conducted emissions
requirements of this section.
Note: AX with BM implies a PWM motor control subsystem and not simply an AX device controlling BM motors
via relays.
The use of a Peak (PK) detector at the same or greater resolution bandwidth (RBW) is allowed as a quick
pre-screen in all bands to increase testing efficiency. If the PK emissions are below the appropriate
requirement(s), the test data may be submitted as the final result. If the PK emissions are above the
requirement(s), it will be necessary to re-sweep the entire band using the specified bandwidth and
detector.
Quasi-Peak (QP) detector is typically used for measurement of “Spark” generated emissions.
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