Iec 61119 3 1992 scan

NORME INTERNATIONALE INTERNATIONAL STANDARD CEI IEC 1119 3 Première édition First edition 1992 11 Système audionumérique à cassette (DAT) Partie 3 Propriétés des bandes Digital audio tape cassette sys[.]

Electroacoustics – Oct av e- band and f act ional- octav e- band fi t ers –

Part 2: Pat t ern- ev aluation t est s

Électroacoustique – Fi t res de bande d'oct av e et de bande d'une f act ion

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Electroacoustics – Octav e- band and f act ional- oct av e- band fi t ers –

Part 2: Pat t ern- ev aluation t est s

Électroacoustique – Fi tres de bande d'oct ave et de bande d'une f act ion

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FOREWORD 3

INTRODUCTION 5

1 Sco e 6

2 Normative ref eren es 6

3 Terms an def i ition 7

4 Submis ion f or testin 7

5 Markin of the filter an information in the in tru tion man al 7

6 Man atory faci ties an general req irements 8

6.1 General 8

6.2 Test in truments 9

7 Tests at referen e con ition 10 7.1 General 10 7.2 Relative at en ation, ef fective b n width deviation an s mmation of output sig als 10 7.2.1 General 10 7.2.2 Relative at en ation 1

7.2.3 Ef f ective b n width deviation 1

7.2.4 Summation of output sig als 1

7.3 Line r o eratin ran e, me s rement ran e, level ran e control an overlo d in icator 12 7.4 Time-in ariant o eration 13 7.5 Power s p ly c ec 13 8 Electromag etic an electrostatic comp tibi ty req irements 14 8.1 General 14 8.2 In uen e of electrostatic dis harges 14 8.3 In uen e of AC p wer freq en y an radio-f req en y f ield 14 8.3.1 Input sig al 14 8.3.2 Ran e setin 14 8.3.3 AC p wer freq en y tests 14 8.3.4 Radio-freq en y tests 15 8.4 Radio-freq en y emis ion an publ c p wer s p ly disturb n es 16 9 Sen itivity to ambient air temp rature an relative h midity 17 10 Patern-evaluation re ort 17 An ex A (informative) Un ertainty related to test by sin soidal swe ps 19 A.1 General 19 A.2 Digital y generated sig al 19 A.3 Test sig al from a sig al generator 2

A.4 Comp rin me s rements 21

An ex B (informative) Test of time in ariant o eration with the u e of an exp nential swe p – Example 2

B.1 General 2

B.2 Example 2

Biblogra h 2

INTERNATIONAL ELECTROTECHNICAL COMMISSION

Part 2: Pat ern-evaluation tests

1 Th Intern tio al Ele trote h ic l Commis io (IEC) is a worldwid org niz tio for sta d rdiz tio c mprisin

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in is e s ble f or th c r e t a plc tio of this p blc tio

9) Ate tio is drawn to th p s ibi ty th t s me of th eleme ts of this IEC Pu lc tio ma b th s bje t of

p te t rig ts IEC s al n t b h ld re p n ible f or id ntifyin a y or al s c p te t rig ts

International Stan ard IEC 612 0-2 has b en pre ared by IEC tec nical commit e 2 :

Electro cou tic

This f irst edition of IEC 612 0-2 ( ogether with IEC 612 0-1:2 14 an IEC 612 0-3:2 16),

can els an re laces the f irst edition of IEC 612 0 publ s ed in 19 5 an its Amen ment 1

publ s ed in 2 01 This edition con titutes a tec nical revision

This edition in lu es the f ol owin sig if i ant tec nical c an es with resp ct to IEC 612 0

a) The sin le doc ment in the f irst edition of IEC 612 0:19 5 is now se arated into thre

p rts of the IEC 612 0 series coverin : sp cifi ation , p tern-evaluation tests an

p riodic tests

b) IEC 612 0:19 5 sp cif ied thre p rf orman e categories: clas 0, 1 an 2 whi e the

IEC 612 0 series sp cif ies req irements for clas 1 an 2

c) In IEC 612 0:19 5, the desig go ls f or the sp cif i ation can b b sed on b se-2 or b

se-10 desig In the IEC 612 0 series only b se-10 is sp cif ied

d) The referen e en ironmental con ition have b en c an ed from 20 °C/6 % RH to

e) IEC 612 0:19 5 sp cif ied toleran e l mits without con iderin the u certainty of

me s rement f or verifi ation of the sp cif i ation The IEC 612 0 series sp cif ies

ac e tan e l mits f or the o served values an maximum-p rmited u certainty of

me s rements f or la oratories testing conf orman e to sp cifi ation in the stan ard

The text of this stan ard is b sed on the f ol owin doc ments:

Ful inf ormation on the votin for the a proval of this stan ard can b f ou d in the re ort on

votin in icated in the a ove ta le

This publ cation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al the p rts of the IEC 612 0 series, publ s ed u der the general title

Electro c u tic – Octa e-b nd a d fa tio al-o tav -b nd filters can b f ou d on the IEC

we site

The commit e has decided that the contents of this publ cation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site u der "htp:/we store.iec.c " in the data

related to the sp cif i publ cation At this date, the publ cation wi b

• recon rmed,

• with rawn,

• re laced by a revised edition, or

• amen ed

IEC 612 0:19 5 an IEC 612 0:19 5/AMD 1:2 01 are now se arated into the f olowin thre

p rts of IEC 612 0 series:

• Part 1: Sp cif i ation

• Part 2: Pat ern-evaluation tests

• Part 3: Periodic tests

For as es ments of conf orman e to p rf orman e sp cif i ation , IEC 612 0-1 u es dif f erent

criteria than were u ed for the IEC 612 0:19 5 edition

IEC 612 0:19 5 did not provide an req irements or recommen ation to ac ou t f or the

u certainty of me s rement in as es ments of conforman e to sp cif i ation This a sen e

of req irements or recommen ation to ac ou t f or u certainty of me s rement cre ted

ambig ity in determination of conforman e to sp cif i ation f or situation where a me s red

deviation f rom a desig go l was close to the l mit of the alowed deviation If conf orman e

was determined b sed on whether a me s red deviation did or did not ex e d the l mits, the

en -u er of the octave-b n an fractional-octave-b n f ilters in ur ed the ris that the true

deviation f rom a desig go l ex e ded the l mits

To remove this ambig ity, IEC Tec nical Commite 2 , at its me tin in 19 6, ado ted a

p l c to ac ou t for me s rement u certainty in as es ments of conf orman e in International

Stan ard that it pre ares

This edition of IEC 612 0-2 u es an amen ed criterion for as es in conforman e to a

sp cif i ation Conf orman e is demon trated when (a) me s red deviation f rom desig go ls

do not ex e d the a pl ca le a c ptan e limits an (b) the u certainty of me s rement do s

not ex e d the cor esp n in maximum-p rmited u certainty Ac e tan e lmits are

analogou to the toleran e lmits al owan es f or desig an man facturin impl ed in the

IEC 612 0:19 5

Actual an maximum-p rmited u certainties of me s rement are determined f or a coverage

pro a i ty of 9 % Unles more sp cif i information is avaia le, the evaluation of the

contribution of a sp cif i f ilter or f ilter set to a total me s rement u certainty can b b sed on

the ac e tan e l mits an maximum-p rmit ed u certainties sp cif ied in this stan ard

ELECTROACOUSTICS – OCTAVE-BAND

Part 2: Pat ern-evaluation tests

1.1 This p rt of IEC 612 0 provides detai s of the tests neces ary to verif y conf orman e to

al man atory sp cif i ation given in IEC 612 0-1:2 14 for octave-b n an fractional

-octave-b n f ilters

1.2 Tests an test method are a pl ca le to clas 1 an clas 2 b n p s filters The aim

is to en ure that al testin la oratories u e con istent method to p rf orm p t ern-evaluation

tests

The f ol owin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an

are in isp n a le for its a pl cation For dated ref eren es, only the edition cited a ples For

u dated ref eren es, the latest edition of the referen ed doc ment (in lu in an

amen ments) a pl es

IEC 610 0-4-2:2 0 , Ele troma n tic c mp tibility (EMC) – P art 4-2: Te tin a d

me s reme t tec niq e – Ele tro tatic d is h rg immu ity te t

IEC 610 0-4-3:2 0 , Ele troma n tic c mp tibility (EMC) – P art 4-3: Te tin a d

me s reme t tec niq e – Rad iated, radio-fe u n y, ele troma n tic field immu ity test

IEC 610 0-4-6:2 13, Electroma n tic c mp tib ity (EMC) – P art 4-6: Te ting a d

me s reme t tec niq e – Immu ity to c ndu ted d isturb n e , induc d b radio-fe u n y

fields

IEC 610 0-6-1, Electromag etic c mp tibility (EMC) – P art 6-1: Ge eric standards –

I mmu ity for re ide tial, c mmercial a d light-industrial e viro me ts

IEC 610 0-6-2:2 0 , Electroma n tic c mp tibiity (EMC) – P art 6-2: Ge eric sta dards –

I mmu ity for industrial e viro me ts

IEC 610 0-6-3, Ele troma n tic c mp tibility (EMC) – P art 6-3: Ge eric standards –

Emissio standard for re idential, c mmercial a d li ht-ind ustrial e viro me ts

IEC 612 0-1:2 14, Ele tro c u tic – Octav -b nd a d fa tio al-o ta e-b nd filters – P art 1:

Sp cific tio s

IEC 616 2-1, Electro c u tic – So nd lev l meters – P art 1: Sp cific tio s

CISPR 16-1-1, Sp cific tion for radio d isturb n e a d immu ity me s rin a p ratu a d

methods – P art 1-1: Radio disturb n e a d immu ity me s rin a p ratus – M ea urin

a p ratu

CISPR 16-1-2, Sp cific tion for rad io d isturb n e a d immu ity me s rin a p ratu a d

methods – P art 1-2: Radio d isturb n e a d immu ity me s rin a p ratus – Co p n devic s

for c nducted disturb n e me s reme ts

CISPR 16-2-1, Sp cific tio for rad io d isturb n e a d immu ity me s rin a p ratu a d

methods – P art 2-1: Methods of me s reme t of d isturb n e a d immu ity – Co ducted

disturb n e me s reme ts

CISPR 16-2-3, Sp cific tio for rad io d isturb n e a d immu ity me s rin a p ratu a d

methods – P art 2-3: Methods of me s reme t of disturb n e a d immu ity – Rad iated

disturb n e me s reme ts

CISPR 2 :2 0 , I nformatio tec n lo y e uipme t – Radio d isturb n e c ara teristic –

Limits a d methods ofme s reme t

ISO/IEC Guide 9 -3, U nc rtainty of me s reme t – P art 3: Guide to the ex pre sio of

u c rtainty in me s reme t (GU M :19 5)

ISO/IEC Guide 9 -4, U nc rtainty of me s reme t – P art 4: Role ofme s reme t u c rtainty

in c nformity a s s me t

ISO/IEC Guide 9 , I ntern tion l v c b lary of metrolo y – Ba ic a d g n ral c n e ts a d

a s ciated terms (VI M)

4.1 At le st thre sp cimen of the same p t ern of b n p s f ilter s al b s bmited f or

p tern-evaluation testin As a minimum, the testin la oratory s al select two of the

sp cimen for testin At le st one of the two sp cimen s al then b tested ful y ac ordin

to the proced res of this stan ard The testin la oratory s al decide whether the f ul tests

s al also b p rf ormed on the secon sp cimen or whether l mited testin is adeq ate to

a prove the p tern

4.2 An in tru tion man al an al items or ac es ories that are identif ied in the in tru tion

man al as integral comp nents for the normal mode of o eration s al b s bmited alon

with the filters

4.3 If the man f acturer of the filters s p l es devices that are to b con ected to the

b n p s filter by ca les for a typical mode of o eration for the f ilter, then the devices an

ca les s al b s bmit ed with the f ilter

5

Marking of the f ilter a d inf ormation in the instruction ma ual

5.1 It s al b verif ied that the f ilter is marked ac ordin to the req irements of

IEC 612 0-1:2 14

5.2 It s al b verif ied that the in tru tion man al contain al the information that is

req ired by IEC 612 0-1:2 14 as relevant to the faci ties provided by the f ilter

5.3 If the f ilter do s not conf orm to the req irements of 5.1 an 5.2, no p tern-evaluation

tests s al b p rf ormed

5.4 Af ter completion of al tests, the inf ormation s al b reviewed to en ure that it is

cor ect an that no a pl ca le ac e tan e l mits are ex e ded

6 Mandatory f aci ities and general re uirements

6.1.1 No test sp cif ied in this p rt of IEC 612 0 series s al b omit ed u les the

b n p s f ilter do s not p s es the f eature des rib d for the test When the desig of a

f ractional-octave-b n f ilter, whic has b en p tern a proved, is c an ed an a new p t ern

a proval is req ested, then – at the dis retion of the testin la oratory – it is not neces ary to

re e t those tests f or p rf orman e c aracteristic that are not af f ected by the desig c an e

6.1.2 If the filter do s not p s es the man atory features l sted in IEC 612 0-1:2 14,

s c as overlo d in icator or me n to c ec that the p wer s p ly is adeq ate for b t ery

p wered in truments whic contain the filter, the f ilter do s not conf orm to the sp cif i ation

of IEC 612 0-1:2 14, an no p tern-evaluation tests s al b p rformed

6.1.3 For al p t ern-evaluation tests, the con g ration of the f ilter s al b as sp cif ied in

the in tru tion man al f or one of the normal modes of o eration, in lu in req ired

ac es ories Al con g ration of the f ilter that are stated in the in tru tion man al as

conf ormin to the req irements of IEC 612 0-1:2 14 s al b tested

6.1.4 If the in tru tion man al states that the f ilter conforms to the sp cif i ation of

IEC 612 0-1:2 14 with o tional faci ties in tal ed, the combination with the o tional faci ties

in taled s al also b tested to verif y conforman e to the relevant sp cif i ation

6.1.5 If the filter is en losed in an in trument containin a level detector an a display

device f or displayin the level of the f iltered sig al with a resolution of at le st 0,1 dB, the

displayed value f rom this display device s al b u ed for testin , if a pro riate If an

electrical output is provided cor esp n in to the displayed value an the testin lab ratory

inten s to uti ze the electrical output in te d of the display device, the la oratory s al verif y

that c an es in the levels of a pled electrical input sig als prod ce cor esp n in c an es

in the sig al levels in icated on the display device an at the electrical output that are in

ac ordan e with the sp cifi ation of IEC 612 0-1:2 14

6.1.6 F r b n p s filters that are desig ed to o erate with me s rin devices that comply

with the req irements f or sou d level meters as sp cif ied in IEC 616 2-1, the display

in icator of this device s al b u ed to me s re the level of the output sig al f rom the f ilter

set

6.1.7 F r f ilter sets with digital re dout devices, or with output that is avaia le in a

man f acturer sp cified digital format (f or example over a digital interf ace con ection), the

level of the output s ould b determined from the n meric re dout or via the digital output to

a s ita le display or recordin device Where multiple outputs are present, if an output is

sp cif ied in the in tru tion man al f or testin , this output s al b u ed for the p tern

-evaluation tests

6.1.8 If the in tru tion man al sp cif ies a proced re for adju tin the f ilter, e.g sen itivity

adju tment, this proced re s al b fol owed b f ore an me s rements are p rf ormed

6.1.9 F r al tests, the f ilter s al b p wered f rom its prefer ed s p ly If the in tru tion

man al sp cifies req irements for the internal b teries, s c b t eries s al b in tal ed for

the p t ern-evaluation tests

6.1.10 The f ilter s al b al owed to re c eq i brium with the prevai n en ironmental

con ition b f ore switc in on the p wer to p rform a test

6.1.1 If the f ilter has more than one sig al-proces in c an el, p tern-evaluation tests

s al b p rf ormed f or e c c an el that uti zes u iq e sig al proces in tec niq es For

multi-c an el s stems with the same fun tional eq ivalen e in al c an els, the n mb r of

c an els to b tested may b les than the total n mb r of c an els, at the dis retion of the

testin la oratory

6.1.12 Conforman e to a p rforman e sp cif i ation is demon trated when the fol owin

criteria are b th satis ed:

a) the me s red deviation f rom the desig go l do s not ex e d the a pl ca le ac e tan e

l mit an ;

b) the cor esp n in u certainty of me s rement do s not ex e d the cor esp n in

maximum-p rmit ed u certainty of me s rement given in IEC 612 0-1:2 14 f or the same

coverage pro a i ty of 9 %

IEC 612 0-1:2 14 gives example as es ments of conforman e u in these criteria

6.1.13 L b ratories p rf ormin p t ern-evaluation tests s al calc late al u certainties of

me s rements in ac ordan e with the g idel nes given in the ISO/IEC Guide 9 -3 Actual

me s rement u certainties s al b calc lated for a coverage pro a i ty of 9 % Calc lation

of the actual me s rement u certainty f or a p rtic lar test s ould con ider at le st the

f ol owin comp nents, as a plca le:

• the u certainty atributed to cal bration of the in ivid al in truments an eq ipment u ed

to p rform the test;

• the u certainty res ltin f rom en ironmental ef f ects;

• the u certainty res ltin f rom er ors that may b present in the a pl ed sig als;

• the un ertainty atributed to ef fects as ociated with the re e ta i ty of the res lts of the

me s rements When a la oratory is only req ired to p rform a sin le me s rement, it is

neces ary for the la oratory to make an estimate of the contribution of ran om ef fects to

the total u certainty The estimate s ould b determined f rom an evaluation of several

me s rement res lts previou ly o tained for a simi ar f ilter an p rameter;

• the u certainty as ociated with the resolution of the display device u ed to display the

resp n e from the f ilter F r digital display devices that in icate sig al levels with a

resolution of 0,1 dB, the u certainty comp nent s ould b taken as a rectan ular

distribution with semi- an e of 0,0 dB

6.1.14 If the u certainty of me s rement ex e d the maximum-p rmit ed u certainty of

me s rement, the res lt of the test s al not b u ed to demon trate conf orman e to a

sp cif i ation, an p t ern a proval s al not b granted

6.1.15 As a pro riate, the la oratory s al uti ze the recommen ation given in the

in tru tion man al for p rf ormin the p t ern-evaluation tests

6.2 Te t in trume ts

6.2.1 The la oratory s al u e in truments with val d cal bration for the a pro riate

q antities The cal bration s al b trace ble to national stan ard , as req ired

6.2.2 Most of the req ired tests uti ze ste d sin soidal sig als of variou freq en ies an

sig al levels Sin soidal sig als f or test of f ilter aten ation s al have a total distortion of not

more than 0,01 % f or clas 1 filters an not more than 0,0 % for clas 2 f ilters The total

distortion f or sin soidal sig als f or other tests s al not ex e d 0,1 %

6.2.3 Tests f or time in ariant o eration u e a con tant ampl tu e sin soidal sig al the

f req en y of whic is varied, or swe t, at an exp nential rate The ef fect on the deviation of

the me s red time-averaged output sig al level f rom the u certainty in the ampl tu e an

swe p- ate f or the determination of time-in ariant o eration s al b determined The

exp n ed u certainty s al not ex e d the values given in IEC 612 0-1:2 14, An ex B

NOT Th inf ormativ An e A giv s e ample of h w s c u c rtaintie ma b o tain d

6.2.4 In truments f or me s rin the en ironmental con ition d rin the tests s al have

an exp n ed u certainty not ex e din 0,5°C for temp rature an 3 % f or h midity

7 Tests at ref erence conditions

7.1.1 Al tests at ref eren e con ition ex e t test for electromag etic an electrostatic

comp tibi ty s al b made within the temp rature ran e 2 °C to 2 °C an within the ran e

f or relative h midity 3 % to 6 %

7.1.2 The f ilter s al b p rmit ed to ac l matize at the referen e en ironmental con ition

f or at le st 6 h

7.1.3 The me s red values of temp rature an h midity s al b exten ed with the actual

exp n ed u certainty of me s rement an s al not ex e d the sp cif ied ran e It is as u

m-ed that the in uen e f rom c an es in the atmospheric pres ure is in ig if i ant comp red to

the sen itivity to other en ironmental p rameters If this is not the case, the o servation s al

b re orted

7.2 Relativ at e uation, ef fe tiv ba dwidth de iation a d s mmation of output

sig als

7.2.1.1 The me s rement of relative aten ation, ef f ective b n width deviation an

s mmation of output sig als are made by the same set of me s rements u in the resp n e

to con tant ampl tu e sin soidal sig als at variou f req en ies

7.2.1.2 The me s rement s al b p rf ormed on the ref eren e level ran e The level of

the input sig als s al b (1 ± 0,1) dB b low the sp cif ied up er b u dary of the l ne r

o eratin ran e

7.2.1.3 With the input an output of the in trument terminated, if a pro riate, with the

imp dan es sp cif ied by the man facturer, a ste d sin soidal sig al is a pl ed to the input

of the f ilter set The relative at en ation at a pro riate f req en ies is me s red

7.2.1.4 The freq en ies of the sin soidal test sig al f or one f ilter are sp ced at eq al

intervals on a logarithmic s ale centred on the exact midb n f req en y If S is the n mb r of

test freq en ies p r filter b n width, the normalzed f req en y Ω

NOT If th fiter c n ists of a s t of fiters o eratin in p ralel (e l time a aly ers), it wi n rmaly b s ita le

to me s re th re p n e to a p rtic lar fe u n y for al f ilter b n s simulta e u ly a d store th re ult for furth r

c lc latio s

7.2.2 Relativ at e uation

7.2.2.1 The relative at en ation ∆A(Ω) at an f req en y is determined from Formula (8)

given in IEC 612 0-1:2 14 The me s red relative at en ation s al not ex e d the

ac e tan e lmits given in section 5.10 of the same stan ard

7.2.2.2 The relative at en ation s al b me s red f rom 0,5 times the exact midb n

f req en y of the f ilter in the set with the lowest midb n freq en y, to 1,5 times the midb n

f req en y of the filter in the set with the hig est midb n freq en y

7.2.2.3 Deviation b twe n actual an req ested f req en y s al b con idered when

statin the u certainty for testin of relative aten ation

7.2.3 Ef fe tiv ba dwidth d viation

7.2.3.1 The ef f ective b n width, B

e, s al b determined from Formulas (13) an (14)

given in IEC 612 0-1:2 14, b sed on n merical evaluation of the integral expres ion in

Formula (14) of the same stan ard for normal zed ef fective b n width

7.2.3.2 For eac f ilter in a f ilter set, the recommen ed proced re for n merical integration

of Formula (14) of IEC 612 0-1:2 14 is by the tra ezoidal rule f or s mmation of elemental

are s ac ordin to:

7.2.4 Summation of output signals

7.2.4.1 L t j identif y a f ilter in a set of f ilters with j 1 an j+1 re resentin the contiguou

f ilters with midb n f req en ies lower an hig er than f or the j-th f ilter L t ∆A

7.2.4.2 With S eq al to the n mb r of test freq en ies p r f ilter b n width f rom the relative

at en ation tests, let M b eq al to the largest integer ju t les than or eq al to S /2 an let i

b an integer b twe n –M an +M to determine a freq en y f or a me s rement of relative

dif feren e ∆

j(Ω

i) b twe n the input sig al level min s the ref eren e aten ation an the level

of the s mmed output sig als is determined f rom the relation hip:

7.2.4.4 The test s al b car ied out f rom the filter with in ex j cor esp n in to the f ilter

adjacent to the f ilter with the lowest midb n freq en y to the f ilter adjacent to the f ilter with

the hig est midb n f req en y in the set of f ilters

7.2.4.5 For an f ilter b n width provided, the dif f eren e ∆P

j(Ω

i) calc lated ac ordin to

f ormula (3), s al not ex e d the ac e tan e l mits given in 5.16 of IEC 612 0-1:2 14

7.3 Line r operating ra ge, me s reme t ra ge, le el ra g control a d ov rloa

in ic tor

7.3.1 Line rity of the resp n e of a f ilter res ltin f rom c an es in the level of the sig al at

the input s al b tested with ste d sin soidal sig als with sp cif ied level an freq en y The

l ne rity s al b me s red at the exact midb n freq en y The level l ne rity deviation

s al b determined in ac ordan e with 5.13 of IEC 612 0-1:2 14

7.3.2 The level l ne rity s al b tested for thre filters on e c avai a le level ran e The

f ilters s al b the f ilter with the lowest an the hig est midb n f req en y in the set of f ilters

an a f ilter in the mid le of the freq en y ran e selected by the la oratory p rformin the

test

7.3.3 The level ran e control s al b set to select the referen e level ran e The level of

the input sig al s al f irst b set to the sp cif ied ref eren e input sig al level The

cor esp n in output level s al b u ed f or calc latin the level lne rity deviation for al

input levels on an level ran e for the p rtic lar filter

7.3.4 The test s al b p rf ormed f or levels from the sp cif ied lower b u dary of the

sp cif ied l ne r o eratin ran e up to a level where the overlo d in icator display an

overlo d Adju t the level of the input sig al with ste s that are not gre ter than 5 dB The

dif feren e b twe n s c es ive ste s of the input sig al level s al b red ced to 1 dB when

the distan e to the lower or up er b u daries of a l ne r o eratin ran e is les than 5 dB

an when the level is a ove the up er b u dary The b u daries are as stated in the

in tru tion man al for the filter If no overlo d is displayed, the filter do s not conf orm to the

req irements

7.3.5 The averagin time d rin a me s rement s al b lon enou h to esta l s a sta le

in ication con iderin the actual freq en y an the in uen e of internal y generated noise at

low input sig al levels so the u certainty of the me s rement is within the req ired maximum

-p rmit ed u certainty

7.3.6 The me s red level l ne rity deviation s al not ex e d the ac e tan e l mits given in

5.13.3 an 5.13.4 in IEC 612 0-1:2 14 f or al me s red levels b twe n the lower b u dary of

the l ne r o eratin ran e f or the a pro riate level ran e as stated in the in tru tion man al

f or the f ilter, and up to the hig est level, me s red as des rib d a ove, without an overlo d

in ication

7.3.7 An overlo d s al not b in icated if the level of the input sig al is b low the stated

up er b u dary of the a pro riate level ran e

7.3.8 It s al b verif ied that the minimum time f or presentin an overlo d is as sp cif ied in

5.17.3 in IEC 612 0-1:2 14

7.3.9 For b n p s f ilters with a device that display time-averaged output sig al levels,

time-integrated b n levels, maximum levels, or display stored res lts, it s al b verif ied

that an overlo d is displayed if an overlo d con ition oc ur ed d rin an p rt of the

me s rement d ration an that the in ication remain displayed u ti the me s rement res lt

is reset

7.3.10 Re e t the test f or al avai a le level ran es for the selected f ilters

7.4 Time-in aria t operation

7.4.1 If the in tru tion man al sp cif ies that the f ilter p rforms time-in ariant o eration, the

time-in ariant o eration of the filter s al b demon trated by a swe t-f req en y test as

des rib d in 5.14 in IEC 612 0-1:2 14 The test s al b con u ted on the referen e level

ran e The level of the input sig al s al b 3 dB les than the up er b u dary of the l ne r

o eratin ran e on the ref eren e level ran e

7.4.2 The swe p s al start at the freq en y, f

at en ation of the f ilter is again at le st 5 dB

7.4.3 For b n p s filters con istin of a set of f ilters with dif ferent midb n f req en ies,

the me s rement may b p rf ormed as one swe p coverin al f ilters in the set f

start

is then

les than the lowest b n ed e freq en y for the f ilter with the lowest midb n freq en y in

the set an where the relative at en ation for this filter is at le st 5 dB f

e d

is then gre ter

than hig est b n ed e f req en y for the f ilter with the hig est midb n f req en y an where

the relative at en ation of this f ilter is at le st 5 dB

7.4.4 The time-averaged level of the output sig al is me s red for an averagin time, T

a g,

whic starts no later than the time when the swe p freq en y is les than the lowest midb n

f req en y an where the relative aten ation of a f ilter is at le st 5 dB, an en s at a time

not les than when the swe p f req en y is gre ter than the highest midb n f req en y where

the relative aten ation of the f ilter is again at le st 5 dB The averagin time s al b

s f f iciently lon to also contain p rts of the output sig al delayed by the o eration of the f ilter

7.4.5 The me s red time-average or eq ivalent-contin ou output sig al level for e c

f ilter in the set s al b comp red with the calc lated value, L

c, given in Formula (17) in

IEC 612 0-1:2 14 The dif f eren e s al b les than or eq al to the ac e tan e l mit given in

5.14.3 in IEC 612 0-1:2 14

NOT 1 Th informativ An e B giv s a e ample for s le tin a e u te start a d e d fe u n y, swe p rate

a d a era in time

Both the ampl tu e an the swe p- ate s al b con idered when the u certainty of

me s rement is calc lated Some commercial swe p generators a proximate an exp nential

swe p by a piecewise l ne r swe p givin large deviation from the calc lated res lts, whie

others demon trate a con tant exp nential swe p rate within smal toleran es The

exp nential swe p sig al may b generated by playin a calc lated sig al throu h a digital

-to-analog e con erter with k own an verif ied sp cif i ation Se the informative An ex A for

f urther inf ormation

7.5 Power s pply c e k

7.5.1 For in truments that req ire a b t ery p wer s p ly, a s ita le p wer source with an

adju ta le s p ly voltage s al b s bstituted f or the b t ery The f ilter s al f irst b tested at

the nominal voltage sp cif ied in the in tru tion man al with a sin soidal input sig al

cor esp n in to the ref eren e level on the ref eren e ran e an at the exact midb n

f req en y in a f ilter selected by the la oratory p rf ormin the test The output level f or the

f ilter with a midb n f req en y cor esp n in to the f req en y of the test sig al s al b

noted

7.5.2 The test s al b re e ted with the p wer s p ly del verin the maximum voltage

sp cif ied in the in tru tion man al, an then with the p wer s p ly delverin the voltage ju t

a ove the voltage b fore the me n to c ec the p wer s p ly in icates that the voltage is

to low The largest dif feren e b twe n an two of the thre o servation of the output level

s al not ex e d the ac e tan e l mits given in 5.21 in IEC 612 0-1:2 14

8 Ele tromagnetic and ele trostatic compatibi ity requirements

The en ironmental con ition of temp rature an h midity d rin testin ac ordin to

Clau e 8 s al b recorded

8.2 Inf lu nc of ele trostatic dis harge

8.2.1 The eq ipment req ired to determine the in uen e of electrostatic dis harges on the

o eration of a f ilter s al conf orm to the sp cif i ation given in Clau e 6 of

IEC 610 0-4-2:2 0 The test set-up an test proced re s al b in ac ordan e with the

sp cif i ation given in Clau es 7 an 8 of IEC 610 0-4-2:2 0

8.2.2 Electrostatic dis harge tests s al b con u ted with the f ilter o eratin an set to

have the le st immu ity to electrostatic dis harge, as determined by prel minary testin If the

f ilter can b f it ed with con ection devices that are not req ired f or the con g ration of the

normal mode of o eration as sp cif ied in the in tru tion man al, then no ca les s al b

f ited d rin the electrostatic dis harge tests

8.2.3 Dis harges of electrostatic voltages s al not b made to electrical con ector pin

that are reces ed b low the s rface of a con ector or b low the s rface of the case of the

filter

8.2.4 Electrostatic dis harges of the gre test p sitive an gre test negative voltage

sp cif ied in 5.2 2.1 of IEC 612 0-1:2 14 s al b a pled ten times by contact an ten times

throu h the air Dis harges s al b a pled to an p int on the f ilter that is con idered

a pro riate by the testin la oratory The p ints s al b l mited to those that are ac es ible

d rin normal u age If u er ac es is req ired to p ints in ide the f ilter, those p ints s al b

in lu ed, u les the in tru tion man al pres rib s precaution again t damage by

electrostatic dis harges d rin this ac es Care s ould b taken to en ure that an eff ects of

a dis harge to the f ilter u der test are f ul y dis ip ted b fore re e tin the a plcation of a

dis harge

8.2.5 Af ter a dis harge, the filter s al return to the same o eratin state as b f ore the

dis harge An data stored b fore the dis harge s al b u c an ed af ter the dis harge Un

-q antif ied c an es in the p rf orman e of the f ilter are p rmit ed when a dis harge is a pl ed

8.3 Inf lu nc of AC power-f re ue c a d ra io- re ue c f ields

8.3.1 Input sign l

No input sig al s al b a pl ed, an the input terminal s al b con ected to sig al grou d or

a terminatin resistan e if so sp cif ied in the in tru tion man al f or the filter

8.3.2 Ra ge s t ing

If the filter has more than one level ran e, the referen e level ran e s al b selected

8.3.3 AC power-f re u nc te ts

8.3.3.1 Tests f or the in uen e of AC p wer freq en y f ield s al u e a device ca a le of

prod cin an es ential y u if orm ro t-me n-s uare mag etic f ield stren th of 8 A/m The

device s al p rmit immersion of the complete filter, or the relevant comp nents desig ated in

the in tru tion man al, in the mag etic f ield The freq en y of the alternatin mag etic f ield

s al b 5 Hz or 6 Hz The exp n ed u certainty f or me s rements of mag etic f ield

stren th s al not ex e d 8 A/m

8.3.3.2 The f ilter u der test s al b oriented as sp cif ied in the in tru tion man al for

le st immu ity to an AC p wer f req en y field

8.3.3.3 The level of the output sig al in e c b n s al b recorded an verif ied to b

b low the l mit sp cif ied in 5.2 3.9 of IEC 612 0-1:2 14 The d ration of exp s re s al b at

le st 10 s

8.3.4 Ra io-f re u nc te ts

8.3.4.1 The equipment req ired to determine the in uen e of adio-f req en y f ield on the

o eration of a f ilter s al conform to the sp cifi ation in Clau e 6 of IEC 610 0-4-3:2 0

The c aracteristic of s ita le faci ties for testin immu ity to radio-freq en y field are given

in An ex C of IEC 610 0-4-3:2 0 Anten as f or generatin radio-f req en y f ield are

des rib d in An ex B of IEC 610 0-4-3:2 0 The u if ormity of the radio-f req en y f ield in

the test faci ty s al b determined by the proced re given in 6.2 of IEC 610 0-4-3:2 0 The

test set-up an test proced re s al b in ac ordan e with the sp cif i ation given in clau es

7 an 8 of IEC 610 0-4-3:2 0

8.3.4.2 Tests for the in uen e of radio-f req en y f ield s al b con u ted with the f ilter

set to the normal mode of o eration as stated in the in tru tion man al The f ilter s al b

oriented in the direction with minimum immu ity to radio-f req en y f ield

NOT If th fiter is b s d o digital pro e sin of digitiz d s mple of th in ut sig al it wi b u lk ly th t th

immu ity to ra io- e u n y field wi c a g with th b n width of th f ilter a lo g a th mo ulatio fe u n y

is e u l to a mid a d fe u n y For s c fiters, it wi th refore b s f ficie t to te t th immu ity at o e

b n width o ly, s le te b th la oratory p rormin th te t

8.3.4.3 If the filter has an con ection device that p rmits the atac ment of interf ace or

intercon ection ca les, the in uen e of radio-freq en y field s al b tested with ca les

con ected to al avaia le con ection devices The len th of the ca les s al b as

recommen ed in the in tru tion man al Al ca les s al b u terminated an ar an ed as

des rib d in 7.3 of IEC 610 0-4-3:2 0 u les the man f acturer of the filter also s p les the

device that is con ected to the f ilter by a ca le In the later event, the in uen e of radi

o-f req en y f ield s al b determined with al items con ected together

8.3.4.4 In ac ordan e with IEC 610 0-4-6:2 13, f or group Z han -held f ilters, d rin the

tests of the in uen e of radio-freq en y f ield , an artif i ial han s al b placed aroun the

han -held ac es ories or keyb ard, as req ired

8.3.4.5 The ro t-me n-s uare electric f ield stren th (when u -mod lated) an mod lation

f req en y s al b as sp cif ied in 5.2 3.2 of IEC 612 0-1:2 14 The car ier f req en y of the

mod lated sig al s al b varied in in rements of up to 4 % over the ran e from 2 MHz to

5 0 MHz The interval s al b up to 2 % f or f req en ies f rom 5 0 MHz to 1 GHz an f or

freq en ies f rom 1,4 GHz to 2,7 GHz The l mits of the 9 % coverage interval arou d a

me s rement of ro t-me n-s uare electric f ield stren th s al b not les than – % or

gre ter than + 0 % of the target radio-f req en y electric f ield stren th

NOT A fe u n y in reme t of 2 % or 4 % me n th t th n xt sig al fe u n y is gre ter th n th pre io s

sig al fe u n y b a fa tor of 1,0 or 1,0 , re p ctiv ly Alth u h c rier fe u n y in reme ts of 1 % are

s e ifie in IEC 610 0-4-3:2 0 , fe u n y in reme ts of u to 2 % a d u to 4 % are c n id re a pro riate for

th p rp s s of this Sta d rd

8.3.4.6 At e c car ier f req en y, the level of the output sig al s al b recorded an

verif ied to not ex e d the l mit sp cif ied in IEC 612 0-1:2 14, 5.2 3.10

8.3.4.7 If the in tru tion man al states that the filter conf orms to the sp cif i ation given

in IEC 612 0-1:2 14 for electric f ield stren th gre ter than that sp cif ied in IEC 612

0-1:2 14, then al tests for the in uen e of radio-f req en y f ield s al b re e ted f or the

gre test of those electric f ield stren th

8.3.4.8 Testin at the dis rete f req en ies, as sp cif ied a ove, do s not el minate the

req irement to conform to the sp cif i ation given in IEC 612 0-1:2 14 at al car ier

f req en ies within the ran e sp cified in IEC 612 0-1:2 14 Tests s al b p rf ormed at other

car ier f req en ies if there are in ication that the ac e tan e l mits given in IEC 612

0-1:2 14 mig t b ex e ded at car ier f req en ies b twe n an two s c es ive freq en ies

8.3.4.9 Maintainin the con g ration des rib d a ove, the tests f or the in uen e of radi

o-f req en y f ield s al b re e ted to me s re the in uen e of radio-freq en y f ield in at

le st one other plane The other plane s al b a proximately orthogonal to the prin ip l

plane of the previou orientation, within the l mits of p sitionin for the test f i ture

8.3.4.10 When a radio-f req en y f ield is a pl ed, the f ilter s al remain o erational an in

the same con g ration as b fore the radio-f req en y f ield was a pl ed

8.3.4.1 For group Y or group Z f ilters, ad itional tests des rib d in Ta le 4 of IEC 610

0-6-2:2 0 s al b p rformed to verify conf orman e to the sp cif i ation of IEC 612 0-1:2 14

f or immu ity to radio-freq en y interf eren e at AC input an output p rts The l mits of the

9 % coverage interval arou d a me s rement of ro t-me n-s uare electric f ield stren th

s al b not les than – % or gre ter than + 0 % of the target radio-f req en y electric f ield

stren th

8.3.4.12 For group Z f ilters uti zin or sp cif yin intercon ectin ca les lon er than 3 m,

the ad itional tests des rib d in Ta le 2 of IEC 610 0-6-2:20 5 s al b p rformed to verify

conforman e to the sp cifi ation given in IEC 612 0-1:2 14 f or the immu ity of sig al an

control p rts to radio-freq en y interf eren e The lmits of the 9 % coverage interval arou d

a me s rement of the AC p wer s p ly voltage s al b not les than –0 % or gre ter than

+ % of the target voltage

8.4 Ra io-f re u nc emis ions a d publ c power s p ly disturba c s

8.4.1 Radio-freq en y f ield-stren th emis ion levels, in decib ls relative to 1 µV/m, s al

b me s red by the method of CISPR 16-2-3 The q asi-p ak-detector in trument s al b as

sp cif ied in CISPR 16-1-1 f or the f req en y ran es sp cified in IEC 612 0-1:2 14

8.4.2 Me s rin receivers, anten as, an test proced res s al b as sp cif ied in

Clau e 10 of CISPR 2 :2 0 Al emis ion levels s al conform to the sp cif i ation given in

IEC 612 0-1:2 14 Radio freq en y emis ion tests s al b con u ted with the f ilter

o eratin , p wered by its pref er ed s p ly, an set to the mode an level ran e, as stated in

the in tru tion man al, that prod ce the gre test radio-freq en y emis ion levels

8.4.3 Al f i tures an fitin s u ed to maintain the p sition of the f ilter s al have negl gible

in uen e on the me s rement of radio-f req en y emis ion from the f ilter

8.4.4 Radio-f req en y emis ion levels s al b me s red over the freq en y ran es

sp cif ied in IEC 612 0-1:2 14 in an orientation c osen by the testin la oratory

8.4.5 The radio-f req en y emis ion levels s al b me s red in one other plane c osen by

the testin la oratory The other plane s al b a proximately orthogonal to the f irst

orientation

8.4.6 If the f ilter has an con ection device that p rmits at ac ment of interface or

intercon ection ca les, radio-freq en y emis ion levels s al b me s red with ca les

con ected to al avaia le con ection devices The len th of the ca les s al b the maximum

recommen ed in the in tru tion man al Al ca les s al b u terminated an ar an ed as

des rib d in 8.2 of CISPR 2 :2 0 u les the man facturer of the f ilter also s p l es the

device con ected to the f ilter by a ca le In this lat er case, the radio-freq en y emis ion

levels s al b me s red with al items con ected together

8.4.7 For a group Y or group Z f ilter that is o erated from a publ c p wer s p ly, the

disturb n e to the publc p wer s p ly s al b me s red as des rib d in Clau e 9 of CISPR

2 :2 0 The method of me s rin the disturb n e cau ed by con u ted emis ion s al b

as given in CISPR 16-1-2 an CISPR 16-2-1 F r these tests, the f ilter s al b set to the

ref eren e level ran e u les the in tru tion man al sp cifies another level ran e The f ilter

s al conf orm to the sp cif i ation given in IEC 612 0-1:2 14 an to the l mits given in

5.2 4.2 of IEC 612 0-1:2 14 f or con u ted disturb n es

9 Sensitivity to ambient air temperature and relative humidity

9.1 Tests s al b car ied out to en ure that the f ilter satis es the req irements for the

ran e of ambient air temp ratures an h midity given in section 5.2 in IEC 612 0-1:2 14

The exp s re time at e c ambient temp rature s al b lon enou h to p rmit the in trument

u der test to re c eq i brium with the prevai n temp rature an h midity

9.2 The f ilter s al b p rmit ed to ac l matize at the ref eren e en ironmental con ition f or

at le st 6 h

9.3 For al test con ition other than ref eren e con ition , the f ilter s al b p rmit ed to

ac l matize f or at le st 4 h, u les the testin la oratory has a pl ca le eviden e that a

s orter ac l matization p riod is s f ficient Ra id c an es in air temp rature an h midity

le din to con en ation s al b avoided

9.4 The f ilter s al not b p wered d rin the ac l matization p riod

9.5 The output level on the ref eren e range s al b me s red with a sin soidal input

sig al with a level eq al to the referen e level Thre f ilters s al b tested at the exact

midb n f req en y: The f ilters s al b the filter with the lowest an the hig est midb n

f req en y in the set of f ilters an a f ilter in the middle of the f eq en y ran e selected by the

la oratory p rf ormin the test The tests s al also b re e ted for the same f ilters for an

input level 4 dB b low the ref eren e level

9.6 The resp n e to air temp rature an relative h midity s al b me s red at four

combination of temp rature an relative h midity The f ilter s al f irst b tested at the

ref eren e en ironmental con ition The output level s al b recorded The test s al b

re e ted with the fol owin con ition :

• 5 % relative h midity an the minimum temp rature;

• 5 % relative h midity an the maximum temp rature; an

• 9 % relative h midity an the maximum a pl ca le temp rature for this h midity

The deviation b twe n the actual air temp rature an the temp rature sp cif ied, exten ed by

the actual exp n ed u certainty of me s rement, s al not b more than ± 2 °C

9.7 The deviation b twe n the actual relative h midity an the relative h midity sp cif ied,

exten ed by the actual exp n ed u certainty of me s rement, s al not ex e d ± 5 % Care

s al b a pl ed to prevent con en ation

9.8 The deviation of the output level in icated at the l sted combination of temp rature

an h midity, f rom the output level in icated at the referen e temp rature an h midity s al

not ex e d the req ired ac e tan e lmits given in 5.2 2.3 of IEC 612 0-1:2 14

10 Pat ern-ev luation re ort

10.1 For e c b n p s f ilter that is tested, the p t ern-evaluation re ort s al give f ul

detais of the con g ration that was tested in lu in ac es ories that were in tal ed,

orientation of the f ilter d rin test of electromag etic emis ion an s s e tibi ty, test

con ition in lu in en ironmental con ition an test res lts

10.2 Eac test res lt s al give the me s red deviation f rom the desig go l an the

as ociated actual exp n ed u certainty of me s rement alon with an in ication of

conforman e or non-conf orman e

10.3 The test re ort s al state that the model of the b n p s f ilter conf orms to, or do s not

conform to, the man atory sp cif i ation of IEC 612 0-1:2 14 f or the stated p rforman e

clas an hen e whether the p t ern f or the model of the f ilter is, or is not, a proved If the

model of the b n p s f ilter is p tern a proved, notice of s c a proval s ould b made

publ cly avaia le f or u e d rin s bseq ent p riodic tests

10.4 The test inf ormation noted in Clau e 10 of IEC 610 0-4-3:2 0 s al b in lu ed in the

test re ort The re ort s al des rib an temp rary degradation in p rforman e, los of

f un tion, or los of data noted at the en of a series of tests with electrostatic dis harges, AC

p wer freq en y field , or radiof req en y f ield

Annex A

(informative)

Uncertainty related to test by sinusoidal sweeps

A.1.1 A con tant-ampl tu e sin soidal sig al with a freq en y in re sin at an exp nential

rate is req ired f or the test to demon trate time-in ariant o eration The u certainty in

me s red output level wi de en on the u certainty in the ampl tu e an the u certainty in

the swe p rate This informative an ex gives inf ormation of how the u certainties in the test

sig al may b o tained

A.1.2 If a close a proximation to an exp nential swe p with a con tant ampl tu e sin soidal

sig al f rom a lower freq en y, f

start

to a hig er f req en y f

e dcan b as umed, Formula (17)

in IEC 612 0-1:2 14 may b u ed f or the estimation of the u certainty in the me s red output

level The f ol owin s mb ls are u ed:

inL

u stan ard u certainty of the input level L

in(ampl tu e);

sweeT

swe p( ime) f or the swe p f rom the start

u stan ard u certainty of the averagin time, T

a g( ime);

efu

stan ard u certainty of the en f req en y f or the swe p f

e d(f req en y);

st arf

u stan ard u certainty of the start freq en y for the swe p f

start(f req en y)

Ad itional u certainties, s c as u certainty related to how close the swe p is to an

exp nential swee , u certainty related to the freq en y, s a e or distortion of the sig al an

u certainty related to the adju tment an re din of the values, may a ply

A.1.3 The relation b twe n the stan ard u certainty

cL

u in the output level, L

c, an the

stan ard u certainties defi ed a ove, may b f ou d from the ref er ed Formula (17) in

A.2 Digital y generate signal

A.2.1 The swe p sig al may b generated as a digital sig al with a con tant sampln

f req en y where e c sample of the sig al is computed by a mathematical o eration with

k own u certainty The sig al may b con erted by a digital-to-analog e s stem to generate

the req ired analog e test sig al The u certainty in the test sig al wi then b the combined

u certainty in the mathematical y generated digital sig al, the u certainty in the sampln

f req en y an the u certainty in the digital-to-analog e con erter

A.2.2 The sampl n f req en y of the s stem may b verif ied by playin a mathematical y

generated sig al with a k own an con tant freq en y an me s rin the f req en y by a

freq en y cou ter The u certainty in the swe p rate wi mainly b determined f rom the

ac urac in the mathematical y generated swe p an the u certainty in the sampln

freq en y

A.2.3 The ampl tu e u certainty of the digital-to-analog e s stem may b me s red with a

mathematical y generated sig al with f i ed f req en y an k own ampl tu e The level of the

sig al may then b me s red by a voltmeter The ampl tu e u certainty s ould b tested at

al freq en ies where hig ac urac is relevant f or the req ested swe p This wi normal y

cover the combined f req en y ran e f or the lowest b n -ed e f req en y to the hig est b n

-ed e f req en y in the set of f ilters to b tested

A digital swe p sig al s with ef f ective value 1,0 may b generated by the f ormula b low

where n is the sample n mb r an f

s

is the sampl n f req en y n is then a seq en e of

whole n mb rs from zero up to the whole n mb r closest to f

s

× T

swe p The swe p rate, r, is

given by:

1

lnen

A.3 Test signal f rom a signal generator

A.3.1 Sig al generators a le to generate a con tant-ampl tu e sin soidal sig al with a

f req en y in re sin at an exp nential rate are avai a le However, some generators del ver

only a cru e a proximation to the exp nential swe p with an u k own u certainty in the

swe p rate With s f f icient information from the man facturer of the generator, an u certainty

calc lation as des rib d in A.1 may b a pl ed If s c inf ormation is not avai a le, or the

inf ormation is not s ita le, the swe p rate an u certainty in level has to b me s red

A.3.2 The test sig al f rom the generator may b me s red by a s stem where the sig al is

sampled at a k own sampl n f req en y by an analog e-to-digital s stem with k own

u certainty in me s rement By sig al analy is of the recorded sig al, the in tantane u level

of the swe p sig al an the in tantane u f req en y an th s the swe p rate may b

determined Se [1]

1

f or further inf ormation

A.3.3 Some generators del ver the en f req en y ju t b f ore the swe p is started This

cre tes an u wanted tran ient, an s c generators are theref ore not regarded as s ita le f or

A.3.4 Some swe p generators may halt at the en f req en y f or a sp cif ied time b fore the

swe p is en ed an the f req en y returned to the start f req en y This may b very

con enient to prevent the return to the start freq en y from disturbin the me s rement

A.3.5 The formula (A.2) may b u ed for the fol owin example calc lation f or u certainty in

the test sig al

The input sig al is me s red to b con tant within an u certainty of 0,0 dB, an is adju ted

by re din a display with resolution 0,1 dB This gives

2

2

in0,1dB

Lu

f

st ar0,0 Hz

This gives

C

0,0 7dB

L

u ≈ or an exp n ed u certainty of the test sig al of 0,1 5 dB

If the res lt is in icated on a display whic also has a resolution of 0,1 dB, this u certainty

has to b ad ed The exp n ed u certainty of the displayed value wi then b 0,12 dB

Some u certainties may b ad ed to ac ou t f or the a proximation to an exp nential swe p

an for re e ta i ty

A.4 Comparing measurements

If the f ilter is time-in ariant, the eff ective b n width deviation may b me s red by two

method : the exp nential swe p method as des rib d in this informative an ex an the

f req en y-by-freq en y me s rement des rib d in 7.2.3 The ef fective b n width deviation

calc lated from the res lts are exp cted to coin ide within the u certainty of me s rement

This example s ows how an exp nential swe p may b p rf ormed f or verif i ation of time

in ariant o eration The f ilters to b tested are as umed to b a set of one-third-octave

b n p s filters in the ran e from 6,3 Hz to 2 kHz The filters are contained in an

integratin -averagin sou d level meter, an the display device in the sou d level meter is

u ed f or re din the averaged output level

B.2 Ex mple

B.2.1 A sig al generator with verif ied p rf orman e is as umed to del ver the test sig al The

output f rom the generator is coupled to the input terminal of the f ilter The generator is set to

del ver 1 volt at 1 kHz The sou d level meter/filter is set to the ref eren e level ran e The

sen itivity of the sou d level meter is adju ted to display 12 dB f or this input level ac ordin

to the as umed recommen ation f rom the man facturer The sou d level meter then display

sig al levels in decib ls relative to 1 µV The up er b u dary of the ref eren e level ran e is

as umed to b 13 dB The swe p s al b p rformed at 3 dB b low this level or at 12 dB re

1 µV

B.2.2 The sig al generator is set up f or a swe p from 0,01 Hz to 1 MHz with the ampl tu e

cor esp n in to the req ested level 12 dB This cor esp n s to a swe p ran e of

8 decades The req ired swe p rate is 2 s to 5 s p r decade If the swe p time is set to

3 secon s, this cor esp n s to 3,7 secon s p r decade The sig al generator alows the

swe p to b started man al y Before the swe p is started, the generator del vers a sig al

with the freq en y selected as the start freq en y When the swe p is en ed, the f req en y

is immediately returned to the start f req en y This may cre te a deviation in the me s red

level if the tran ient from the return of the freq en y is a p rt of the averagin p riod

B.2.3 The swe p time in the generator an the averagin time for the sou d level meter are

b th set to 3 s The swe p is man al y started a out 0,5 s to 1,5 s af ter the integration in the

sou d level meter is started Therefore the averagin is en ed b fore the swe p is f i is ed by

the same amou t of time The swe p f req en y when the averagin is f i is ed wi theref ore

b in the ran e 3 8 kHz to 7 6 kHz, whic is wel a ove the up er b n ed e f req en y

2 ,3 kHz for the f ilter with the hig est midb n freq en y an also a ove the f req en y

where the at en ation is at le st 5 dB The tran ient when the swe p freq en y is returned

to the start freq en y wi , with these setin s, b outside the averagin interval

B.2.4 The exp cted output level, L

c, may b computed f rom Formula (17) in

is regarded as the deviation in the test for time in ariant o eration an s al b b low the

ac e tan e l mits given in 5.14 in IEC 612 0-1:2 14 in order to claim time in ariant o eration

f or the f ilter

B.2.6 The one-third-octave f ilter with the lowest midb n f req en y wi have the lon est

impulse- esp n e The averagin p riod wi en 18 s to 2 s af ter the swe p f req en y is

eq al to the lowest midb n f req en y, 6,3 Hz Normal y the tai of the impulse resp n e f or

this f ilter wi b very smal when the averagin en s If this is not the case, the test ne d to

b modified

Bibl ography

[1] BORK, I , Exp nential swe p c ec u in Hi b rt-Tran f orm, Acta Ac stic u ited with

Ac stic , 2 14, vol 10 , p 6 9-6 6

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