ISO 11451-4:1995

INTERNATIONAL
ISO
STANDARD 11451-4
First edition
1995-12-01
Road vehicles - Electrical disturbances
by narrowband radiated electromagnetic
energy - Vehicle test methods -
Part 4:
Bulk current injection (BCI)
Whicules routiers - Perturba tions &lec triques par ra yonnemen t d ‘energie
6lectromagn6 tique en bande 6 troite - Methodes d’essai du vehicule -
Partie 4: Methode d’injection de courant (BCI)
Reference number
ISO 11451-4:1995(E)

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ISO 11451-4:1995(E)
Contents
Page
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope . . . . .s.*.
1
D.aa.*ams‘.*.as.
I.,.~D.,.,,.~.~.
2 Normative reference
1
..........................................................................
3 Test conditions
1
....................................
3.1 Test temperature and supply voltage
1
.....................................................................
3.2 Frequency ränge
1
..............................................................................
3.3 Modulation
.............................................................................. 2
3.4 Dweil time
..................................................................... 2
3.5 Frequency Steps
........................ ................. 2
........................
3.6 Test severity levels
.......................... 2
4 Test instrument description and specification
.............................................................. 2
...............
4.1 BCI System
...................................................................... 2
4.2 I nstrumentation
2
..............................................................................
4.3 Test set-up
2
..........................................................................
5 Test procedure
2
.................................................................................
5.1 Test plan
3
....... ..................................................................
5.2 Test methods
4
..............................................................................
5.3 Test report
Annexes
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Current injection probe calibration method
7
..........................
6 Current monitoring probe calibration method
................. 8
C Function Performance Status classification (FPSC)
0 ISO 1995
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International Organization for Standardization
Case Postale 56 l CH-1 211 Geneve 20 l Switzerland
Printed in Switzerland

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0 ISO
ISO 1145%4:1995(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. Esch 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.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 11451-4 was prepared by Technical Committee
lSO/TC 22, ßoad vehicles, Subcommittee SC 3, Electrical and electronie
equipmen t.
ISO 11451 consists of the following Parts, under the general title ßoad
vehicles - Electrical disturbances by narrowband radiated electro-
magnetic energy - Vehicle tes t me thods:
- Part 7: General and definitions
- Part 2: Off-vehicle radiation Source
- Part 3: On-board transmitter Simulation
- Part 4: Bulk current injection (BC/)
Annexes A and B form an integral part of this part of ISO 11451. Annex
C is for information only.
. . .
Ill

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ISO 11451=4:1995(E)
INTERNATIONAL STANDARD 0 ISO
Road vehicles - Electrical disturbances
by narrowband radiated electromagnetic energy -
Vehide test methods -
Part 4:
Bulk current injection (BCI)
3 Test conditions
1 Scope
This part of ISO 11451 specifies bulk current injection
3.1 Test temperature and supply voltage
(BCI) test methods and procedures for testing the
electromagnetic immunity of electronie components
Heat is generated in the test chamber when the ve-
for passenger cars and commercial vehicles regard-
hicle is operated during the test. Sufficient cooling
less of the propulsion System (e.g. spark-ignition en-
shall be provided to ensure that the engine does not
engine, electric The
gine, diese1 motor-).
overheat.
electromagnetic disturbance considered in this part
of ISO 11451 is limited to continuous narrowband
The ambient temperature in the test chamber
electromagnetic fields.
shall be recorded if it is outside the range of
(23 + 5) “C.
Part 1 of ISO 11451 gives definitions, practical use
and basic principles of the test procedure.
For tests that require the vehicle engine to be running,
the electrical charging System shall be functional. For
tests where the vehicle engine is not required to be
running, the battery voltage shall be maintained above
12,2 V and 24,4 V for 12 V and 24 V Systems re-
2 Normative reference
spectively.
The following Standard contains provisions which,
3.2 Frequency range
through reference in this text, constitute provisions
of this part of ISO 11451. At the time of publication,
To test automotive electronie Systems, the applicable
the edition indicated was valid. All Standards are sub-
frequency range of the bulk current injection (BCI) test
ject to revision, and Parties to agreements based on
method is 1 MHz to 400 MHz.
this part of ISO 11451 are encouraged to investigate
the possibility of applying the most recent edition of
The frequency range of the BCI test method is a di-
the Standard indicated below. Members of IEC and
rect function of the current probe characteristic. More
ISO maintain registers of currently valid International
than one type of current probe may be required.
Standards.
ISO 11451-1 :1995, ßoad vehicles - ElectricaI dis-
3.3 Modulation
turbances by narrowband radiated electromagnetic
Vehicle test methods - Part 1: General The device under test determines the type and fre-
energy -
quency of modulation. If no values are agreed be-
and definitions.
1

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ISO 1145%4:1995(E)
tween the users of this part of ISO 11451, the
4 Test instrument description
following shall be used:
and specification
- no modulation (CW);
4.1 BCI System
- 1 kHz sine-wave amplitude modulation (AM) of
80 %.
BCI is a method of carrying out immunity tests by in-
ducing disturbance Signals directly into the wiring
harness by means of a current injection probe. The
3.4 Dweil time
injection probe is a current transformer through which
the wires of the device under test are passed. Im-
At each frequency, the device under test shall Ge ex-
munity tests are then carried out by varying the test
posed to the test level for the minimum response
severtity level and frequency of the induced disturb-
time needed to control it. In all cases, this minimum
ante.
time of exposure shall not be less than 2 s.
BCI shall be conducted on each individual System fit-
ted to the vehicle.
3.5 Frequency Steps
4.2 Instrumentation
All tests in this part of ISO 11451 shall be conducted
Figure 1 Shows an example of a BCI test configur-
with frequency step sizes not greater than those
ation.
specified in table 1.
An injection probe or set of probes capable of oper-
Table 1 - Frequency step sizes ating over the test frequency range is required to
-1
I interface the test equipment to the device under test.
Maximum
The probe shall be capable of withstanding a continu-
Frequency band
frequency step size
ous input power over the test frequency range re-
MHz MHz
gardless of the System loading.
The monitoring probe or set of probes shall be
capable of operating over the test frequency range.
The monitoring probe(s) shall be terminated in the
load impedance at which they were calibrated.
Alternatively, logarithmic frequency Steps, with the
4.3 Test set-up
Same minimum number of frequency Steps in each
frequency band, may be used. The values as agreed
The vehicle should be tested as built; no additional
by the users of this part of ISO 11451 shall be docu-
grounding connections are allowed. Tests should be
mented in the test report.
performed inside a shielded room.
If it appears that the s
...