Bsi bs au 243 2 1991 (1999) iso 7637 1 1990

BRITISH STANDARD BS AU 243 2 1991 ISO 7637 1 1990 Methods of test for Electrical disturbance by conduction and coupling — Part 2 Electrical transient conduction along supply lines only on passenger ca[.]

Methods oftest for

This Bri sh Stan ard, ha ing

b en pre ared u der the

directon of the Automo ile

Stan ards Policy Commi e ,

was published u der the

authoriy of the Stan ards

Bo rd an comes

into efect on

2 No emb r1 9

© BSI 0 -1 9

The prep ration of this British Stand rd was entrusted b the Automobi e

Stand rds Pol cy Commit e ( AUE/-) to Tech ical Commit e AUE/16, upon

which the fol owing bod ies were represented :

Association of Traier Man facturer

British Ca le Maker Confed eration

Dep rtment of Transport

Institution of Electrical Eng ine r

Motor Ind ustry Resear h Association

National Carav an Cou ci Ltd

Society of Motor Man facturer and Tra er Ltd

Am endm ents is ued sinc publ cation

Commit e s responsible Inside font cov er

5 General tech iq ues to improv e electromag netic

Fig ure 1 — Conducted v oltag e transients measurement test setup 2

Fig ure 2 — Conducted cur ent transients measurement test setup 2

Fig ure 5 — as a fu ction of fequency f om10 kHz

Z

P

This British Stand ard has be n prep red u der the direction of the Automobie

Stand ards Pol cy Commit e and is identical with ISO7 3 -1 “R oa d vehicle —

Ele tr ica l d istur ba nc by cond ucton a nd couplng — Pa r t1: Pa ss nger ca r s a nd

lght commer cia l vehicle wih nomina l 12Vsup ly v la ge — Ele tr ica l tr a nsient

cond ucton a long sup ly lne only , publshed b the International Org anization

for Stand rdization ( ISO)

The Tech ical Commit e has rev iewed the prov isions of ISO6 2 -3, to which

reference is ma e in the text an has d ecid ed that they are ac epta le for use in

conjunction with this stand ard

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

1 Scope

This p rt of ISO7 3 specifies test methods and

proced ures to ensure the comp tibi ty to conducted

electrical transients of eq uipment instaled on

p s eng er car and l g ht commer ial v ehicles fit ed

with a1 V electrical sy stem It des ribes bench

tests for both the injection and measurement of

transients

Fu ctional status clas ifications for immu ity to

transients are giv en in Annex A

NOT General g uidelines for the e aluaton of transient

emis ions, test proced res for which are g iv n in clause , wil

form the subject of a future ad en um

The fol owing stand ard contains prov isions which,

throug h reference in this text, constitute prov isions

of this p rt of ISO7 3 At the time of publ cation,

the edition ind icated was v ald All stand rds are

subject to rev ision, and p rties to ag re ments b sed

on this p rt of ISO7 3 are encourag ed to

inv estig ate the pos ibi ity of a ply ing the most

recent edition of the stand rd indicated.Member of

IEC and ISO maintain reg ister of cur ently v ald

International Stand rd s

ISO6 2 -3:19 4, R oa d vehicle — Uns r eened

low-tension ca ble — Pa r t3: Cond ucto sizes a nd

d imensions

3 Test procedur s

3.1 General

Method s for measuring the transient emis ion on

sup ly l nes an test method s for the immu ity of

d ev ices ag ainst such transients are g iv en These

tests, cal ed “bench tests”, are ma e in the

la oratory

1)

The bench test method s, some of which require the

use of the artificial network, wi l prov id e

comp rativ e results betwe n la oratories They also

g iv e a b sis for the d ev elopment of dev ices and

sy stems and ma be used during the production

phase

A bench test method for the ev aluation of the

immu ity of a dev ice ag ainst sup ly l ne transients

ma be per ormed b means of a test pulse

g enerator; this ma not cov er al ty pes of transients

which can oc ur in a v ehicle Therefore, the test

pulses des ribed in4.6 are characteristic of ty pical

pulses

In special cases, it ma be neces ary to a ply

a d itional test pulses Howev er, some test pulses

ma be omit ed, if a d ev ice — depend ing on its

fu ction or its con ection — is not influenced b

comp ra le transients in the v ehicle.It is p rt of the

v ehicle man facturer’s responsibi ty to define the

test pulses required for a specific d ev ice

To ensure proper v ehicle operation in the

electromag netic env ironment, on-board testing is

es ential

3.2 Test tem perature and test v ltag e

The ambient temperature during the test shal

be23°C ± 5 °C

The test v oltag es shal be as fol ows:

U

A

= 13,5V ± 0,5 V

U

B

= 1 V ± 0,2 V

u les other v alues are ag re d upon b the user of

this p rt of ISO7 3 , in which case such v alues

shal be d ocumented in the test reports

3.3 Transient emis ions test

3.3.1 Voltage transients

V oltag e transients f om the disturb nce sour e,the

dev ice u d er test, are measured using the artificial

network to stand ardiz the imped ance loa ing on

the dev ice u der test ( se 4.1) The d isturb nce

sour e is connected v ia the artificial network to the

sh nt resistor R

s1 ( se 4.2), the switch S ( se 4.3)

and the power sup ly ( se 4.4), as g iv en in Fig ure 1

The lea s betwe n the terminals ofthe d isturb nce

sour e, the dev ice u der test, and the artificial

network shal be laid out in a straig ht p ralel lne

and shal hav e a leng th of0,5m ± 0,0 m

The ca le siz s shal be chosen in ac ord nce with

ISO6 2 -3

The d isturb nce v oltag e is measured at the

terminals P an B of the artificial network

( se Fig ure 1) using a v oltag e probe and an

os i los ope or wav eform acq uisition eq uipment

Repetitiv e transients are measured with switch S

closed I the transient is caused b a sup ly

dis on ection, measurement is started at the

moment ofopening switch S

3.3.2 Cur ent transients

The test setup for measuring the d isturb nce

cur ent is shown in Fig ure 2

The d isturb nce sour e is con ected v ia the

artificial network to the power sup ly Resistor R

s2

( se 4.2) is con ected to the terminals of the

artificial network on the power sup ly side

( se Fig ure 2)

1)

A future p rt of ISO7 3 wil co er on-b ard v hicle tests

The lea s betwe n the terminals of the disturb nce

sour e and the artificial network shal be laid out in

a straig ht p ralel l ne and shal hav e a leng th

of0,5m ± 0,0 m

The disturb nce sour e is dis on ected b the

switch S

The disturb nce cur ent measurement is started

when switch S is opened

The disturb nce cur ent should be measured

betwe n the artificial network and the dev ice u d er

test as close to the artificial network as pos ible

3.4 Transient imm unity test

The test setup for transient immu ity

measurements of electrical/ electronic dev ices is

g iv en in Fig ure 3

The lea s betwe n the terminals of the test pulse

g enerator and the dev ice u der test shal be laid out

in a straig ht p ralel lne and shal hav e a leng th

of0,5m ± 0,0 m

The test pulse g enerator ( se 4.6) is set up to prov ide

the specific pulse polarity , ampl tud e, duration

andresistance with switch T ( se 4.3) open

( Thea propriate v alues are selected f om Annex A.)

Next, the d ev ice und er test is con ected to the

g enerator b closing switch T

Depend ing on the real conditions,the fu ction of the

d ev ice u der test should be ev aluated d uring and/or

after the a pl cation of the test pulses

For cor ect g eneration of the req uired test pulses, it

ma be neces ary to switch the power sup ly on an

of The switching can be per ormed b the test pulse

g enerator if the power sup ly is integ ral to it

Fig ure 1 — Conducted v ltag e transients m easurem ent test setup

Fig ure 2 — Conducted cur ent transients m easurem ent test setup

4 Test instrument description a nd

specifica tions

4.1 Artificial network

The artificial network is used as a reference

stand ard in the la oratory in place of the imped nce

of the v ehicle wiring harnes in order to d etermine

the behav iour of eq uipment and electrical and

electronic d ev ices A s hematic diag ram is g iv en in

Fig ure 4

The artificial network should be a le to withstan a

contin ous load cor espond ing to the req uirements

of the d ev ice u d er test

The resulting v alues of imped nce ,

measuredbetwe n the terminals P and B whie

terminals A and B are con ected tog ether, are

g iv enin Fig ure 5 as a function of f eq uency

as uming id eal electric components In realty ,

theimped nce of an artificial network should not

d ev iate more than10% f om the curv e g iv en in

Fig ure 5

The main characteristic of the components are as

fol ows:

— ma imum contin ous loa cur ent, I = 7 A

— inductance, L = 5 4 H ( air-core winding )

— internal resistance betwe n terminals P

andA: R

L

< 5m7

— ca acitor, C

2

= 0,1 4F for working v oltag es

of20 V

ac

and1 5 0V

d c

4.2 Shunt resistor R

s1 and R

s2

The sh nt resistor R

s1 ( se Fig ure 1) simulates the

dc resistance of other v ehicle d ev ices which are

connected in p ralel to the d ev ice u d er test and

are not dis on ected fom it b the ig nition switch

R

s1

is selected to cor espond to the resistance

measured on the wiring harnes betwe n the

dis on ected ig nition switch terminal an g rou d,

with the switch of, and shal be specified b the

v ehicle man facturer In the a sence of any

specification, a v alue of R

s1

= 4 7 shal be used I

a wire-wound resistor is used , the wind ing shal be

bifi ar ( i.e with a minimum reactiv e component)

Sh nt resistor R

s2 ( se Fig ure 2) is used during

cur ent transient measurements In the a sence of

any specification, a v alue of R

s2

= 2 7 shal be used

The sh nt resistor shal hav e an ad eq uate power

dis ip tion rating

4.3 Switch S and switch T

The switch S ( se Fig ure 1 an Fig ure 2)

sig nificantly influences the disturb nce transients

when tests are per ormed in ac ord nce with 3.2

NOT A sp cificaton for a swich S wih re rod cible

pro ertes is in pre araton In the interim i is pro osed to use a

stan ard prod cton swich that is used wih the de ice u der

test an to p rorm a suficient n mb r of tests to ensure a

statstcaly v lid sample

The switch T ( se Fig ure 3) is a d is on ecting switch

which do s not influence the d isturb nce transients

The cur ent rating of switch T should be suficient to

handle the req uired loa s

4.4 Power supply

W hen a b t ery is used, a charg ing sour e is ne d ed

to achiev e the specified reference lev els

I a stand ard power sup ly ( with suficient cur ent

ca acity ) is used in bench testing to simulate the

b t ery , it is important that the low internal

imped ance of the b t ery also be simulated

Fig ure 3 — Transient im munity test setup

Z

P

The contin ous sup ly sour e shal hav e an internal

resistance R

i

les than0,017 dc and an internal

imped ance Z

i

= R

i for f eq uencies les than4 0Hz

The output v oltag e shal not dev iate more than1 V

fom0 to ma imum load ( i cluding inrush cur ent)

and shal recov er6 % of its ma imum excur ion

within10 4 s The superimposed rip le v oltag e, U

r ,

shal not exce d0,2V peak-to-peak and hav e a

ma imum f equency of4 0 Hz

4.5 Measurement instrumentation

4.5.1 O sci los ope

This should prefera ly be a storag e os i os ope with

the folowing specifications:

— b nd width: at least10 MHz

— writing spe d: at least10 cm/4 s

— input sensitiv ity : at least 5 mV/div ision

The record ing ma be mad e with an os i los ope

camera or any other a propriate recording dev ice

Fig ure 4 — Schematic diag ram of artificial network

Fig ure 5 — as a function of f equency f om10 kHz to10 MHz (AB short-circuited)

Z

P

4.5.2 Volt age pr be:

— at en ation: 10 / 1

— ma imum input v oltag e: at least1 kV

— input imped ance, Z, as a fu ction of the

f eq uency , f:

— ma imum leng th of the probe ca le: 3m

— ma imum leng th of the probe g round : 0,13m

NOT The leng ths wil influence the me surement results an

should b stated in the test re ort

4.5.3 Cur ent measuring pr be:

— minimum measuring rang e: 20A

— ma imum working v oltag e: 5 0V

— b ndwidth ( – 3d B): at least0 to15MHz ( Hal

efect probe)

— at en ator ac uracy : bet er than3%

4.5.4 Wavef rm acquisit ion equipment

Eq uipment that is ca a le of acquiring fast rise

time transient wav eforms ma be used instead of an

os i los ope

4.6 Test pulse g enerator

The test pulse g enerator shal be ca a le of

prod ucing the test pulses d es ribed in 4.6.1 to 4.6.7

and shal be a justa le within the lmits g iv en in

Fig ure 6 to Fig ure 13

Tolerances for the p rameter are

± 10% for time and resistance, and

+ 10% for v olta e ( V

a and V

s )

Recommended v alues for the ev aluation of

immu ity of d ev ices can be chosen fom Ta le A.1

4.6.1 Te t puls 1

This test pulse is a simulation of transients d ue to

sup ly dis on ection f om inductiv e load s; it a ples

to a dev ice und er test if, as used in the v ehicle, it

remains con ected directly in p ralel with an

inductiv e loa

The pulse sha e and p rameter s are g iv en in

Fig ure 6

NOT The tme neces ary b twe n the dis on ecton of the sup ly soure an the a plicaton of the test pulse, t

3 , shal b

minimized

Fig ure 6 — Test pulse1

4.6.2 Te t puls 2

This test pulse is a simulation of transients d ue to

the sudd en inter uption of cur ent in an inductor

con ected in series with a dev ice u der test

It simulates transients which ma for ex mple

oc ur due to the fol owing : after the ig nition is

switched of, dc motor , which are connected to the

same switch as the ig nition, ma contin e rotating

d ue to their inertia, thus acting as g enerator Their

inductance c eates a transient on switching of the

sup ly lne

The pulse sha e and p rameter are g iv en in

Fig ure 7

4.6.3 Te t puls s3a and3b

These test pulses are a simulation of transients,

which oc ur as a result of the switching proces es

The characteristic of these transients are

influenced b distributed ca acitance and

ind uctance of the wiring harnes

The pulse sha es and p rameter for test pulses3

and3 are g iv en in Fig ure 8 and Fig ure 9

respectiv ely

Fig ure 7 — Test pulse 2

Fig ure 8 — Test pulse 3a

Fig ure 9 — Test pulse3b

4.6.4 Te t puls 4

This pulse simulates sup ly v oltag e reduction

caused b energ izing the starter-motor cir uits of

internal combustion eng ines ( excluding spikes

as ociated with starting )

The pulse sha e and p rameter are g iv en in

Fig ure 10

Fig ure 10 — Test pulse4

4.6.5 Te t puls 5

This test pulse is a simulation of load d ump

transient oc ur ing in the ev ent of a d is harg ed

b t ery being d is on ected whi e the alternator is

g enerating charg ing cur ent at the moment of the

b t ery being d is on ected with other loa s

remaining on the alternator cir uit at this moment;

the load d ump ampl tud e d epend s on the alternator

spe d and on the lev el of the alternator field

excitation at the moment of the b t ery being

dis onnected The loa d ump pulse duration

depends es ential y on the time constant of the field

excitation cir uit and on the pulse ampl tude

Loa dump ma oc ur on ac ou t of a b t ery being

dis onnected resulting f om ca le cor osion, po r

con ection or the b t ery being dis on ected

intentionaly whi e the eng ine is ru ning

The pulse sha e and p rameter are g iv en in

Fig ure 1

The fol owing g eneral considerations of the d y namic

behav iour of alternator during load dump a ply :

a) The internal resistance of an alternator, in the

case of loa dump, is mainly a fu ction of

alternator rotational spe d and excitation

cur ent

b) The internal resistance, R

i , of the loa d ump

test pulse g enerator shal be obtained f om the

folowingrelationship:

where

c) The pulse is determined b the peak v oltag e V

s ,

the internal resistance R

i , an the pulse d uration

t

d

; in al cases smal v alues of V

s are cor elated

with smal v alues of R

i and t

d , an hig h v alues of

V

s with hig h v alues of R

i and t

d

4.6.6 Te t puls 6

This test pulse is a simulation of a transient at the

moment of cur ent inter uption in the ig nition coi

The pulse sha e and p rameter are g iv en in

Fig ure 1

4.6.7 Te t puls 7

This test pulse is a simulation of the efect of

alternator mag netic field deca at the moment of

eng ine switch-of It a ples primari y to sy stems

using electro-mechanical v oltag e r eg ulator

The pulse sha e and p rameter are g iv en in

Fig ure 13

Fig ure 1 — Test pulse5

V

nom

is the specified v oltag e of the

alternator;

I

rated

is the specified cur ent at an alternator

spe d of6 0 0min

– 1

( as g iv en in

ISO8 5 );

N

act

is the actual alternator spe d, in

reciprocal min tes

R

i

nom

act

×

0,8 I

rated

1

×

=