[woes] WARD -BECK S YSTE MS LTD ..... PAOGAIESS~.~c;NT......c ........ ax ..Tali,. oe.>.~ n!"'~ "l!!UoO.38~

M405PORT ABLE EXTENDED RANGE

VU METER

!::!"'''' UAL ISSUE 12

WAFl D-B E CI< S YSTE M S LTD .

TABLE OF CONTENTS

""' OS PORTA BLE EXTENDED RANGE VU MET ER

Warran l yTe c h n ic a l Da taGe nera lCIN:ui l De sc rip t io nOperaliona l De sc r i pl ionMa int en a n c eDC VOl tage ChartPar t s U st

"""OS Schemal ic",",OS Front & Re ar La youtSA 142 PC8 COtnpon enl La you t

I.'2-'3- 1 103-24_ 1 10 4_2

5-'.-,7_ 1 to 7_4

8 4OS-Q2_00te4OS-Q4-0IJ8142-<16_001

WARD-BECK SYSTEM. LTD.

TECH NIC AL DATA

"14M PORTA BLE EXTE NDED RANGE VU METER

Ra ng e; -50 dBm to ·30 d Bm i n 2 d B s te ps loro VU r eading.

F r equency Response: . /_O.~ d B l rom 20 Hz to 20 k H:r.-30 dB do wn a t 60 Hz wi lh filt er i n .

S ignll ! 10 no is .. r ll i io b elte r Ih a n SO dBme llsured from 0 VU meter relld lng .

To tal Harmonic Les s tnlln 1'1 from 20 Hz to 20 k H:rDistor iion ; (mea su r ed with a n y speci fi ed inpu t le v e l

and a l 0 VU ou tpu t le v e l ).

Source Imp edance : ISO/600 o hms .

I npu t Imp ed an c,,: Selec tab le , 150 /600/20K oh ms ' / - 5%,unba lanced, l loa t i n g " bovegrou nd .

All " n u "tor Tr a c k i n g: '/~O .25 d B p" " s t e p (non cumu la tive)

Me le r Ba ll i st ic s : Comp lies with ASA VU me Ier s t a n d a r d s .

Heee set Ou tpu t: 0 dBm (approx l 600 ohm s .

Pow e r R..quir....... nt s: Sel f-con l a ined re~charg.. a bl .. ba l le ri e , .L ine cord s u pp l ie d to opera l.. from 115Vec and t o r e-ch arge cel ls.

Banery L if e: Mor e than 40 1'1..... con tinuou", u "''' .Ty p ic al ly 30 d a y s a l 2 hrs. ~.. dayInle......i l ten l us" .

5.00" wi d e .. 9 .00 " h ig h x 5.00" d eep( 125mm .. 225mm .. 125mml .

Weigl'l l: 7 Ib "'. ( 3 kg ) n" t .

WARD-BECK SYSTEMS LTO .

~

M405 PORT ABLE EXTE NOEO RANGE VU MET ER

The M405 Extended Ra n ge VU Me Ie r i .. a n ac/ba llery opera te d,porlable InSlrumen l d es ig ned fo r Ih .. me .. "u remen l of I r a n s mis s lon ,noise .. nd VU levels Ihroughoul "n .. u d io .. yS lem . The insl ......men tproduces e 0 VU indic.. t ion on a 4 1/ 2 inch meier for i np ut levelsfrom -SO dBm to -30 d Bm over e 20 Hz to 20 kH z b.. ndwid th.

An inpul .. Ue n U.. lor , c .. libr.. l e d in 2 dB " Ieps, .. ccommod.. le s the fu ll80 d B r e nge in one conlinuous 300 de g ree ro t e t ion. Front p .. nelseleclor swilchn e re pro\/ided 10 permi l Ih .. M405 to op.. r e l e In t hemalchlng or bridging mode {fo.- u" .. wi lh un lermi na te d or l e rm i n a le dIr e nsmission lines), a s we ll e s allow me inSlrument 10 operatedirec lly wilh 150 or 600 ohm 5ysl"'" ilTlP<'dance:s . In .. d dilion, e 60Hz nOlch l it l e r may be switched in 10 permit measuremenll 10 beoble ined In Ih e presence of hum .

The act,\/e clrcui ,,-y ulil lzes FE T dO'vlces 10 .. chi .. v .. high Imped.. oceopenl.lion wllh minimum Curl'"fll t dem.. n d (I .. "" Ihan I mAl . The M405..... y be OPe .... led con tinuous ly from the in le ..n .. l nicke l c .. dtnlu", cellslor more than 40 hours or t yp ic .. l ly 30 d.,ys of in termittent usebefore rech.,rglng .

InpU I conne<:l ions to the mel m.. y b .. vi a binding po st 1....... I..., l s or., t.. l.. phone t y pe jack conv ie ntly loca led on th e fron t panel . Anoutput jack provides .. n i nd e pe n d en t 0 d Bm (a pprox .) 600 ohm le v elfor use a s a headsel mon l lor or auxlli .. ,-y l in e .. mpllli .... .

CI RCUI T DESCR IP T ION

M405 P ORTABLE EXTE NDED RANGE VU MET ER

Th e s ig n a l i n p u t to t he M4 0 5 Ex tended Range VU Me te r ma y b" viabinding po st t"rm in a ls J2 and J3 or t" lephone j ack J1 . An input viaJl autom"tic" lly di sconnects t h e b inding po s t in p u t c i rcu it wh ich i sconnected t o t h e norm,, 1 s p ri n g s of t h e j "ck .

The i npu t a mp l ifie r conf i g u r a t io n i s unbalanced but f lo a t i n g wi t hr e s pe ct to chassi s ground and c an , t herefore, be u t i li ze d in conj un c t­i o n w ith bal anced a u d io l i n es wi t houl i n troduc i ng dis t u r b a n ce s .

Ma tc h in g / b ri dg in g sw i tch SW1, d e term in es th" lo a d p r e sented by th ei n s tr u me n t to the s ou r<;" (matching or 20K o hm bridgingl . Met e ri mp ed a n ce swi tch SW2 compens ates t he i np u t o f the in st r umen t topresent t h e p r-ope r- line termina tio n and si mu l t a neo us l y IIdj u s t s t h ein St r u me n t voltage g ain to produce t h e c o rrec t met er i n di c a t io n fo rISO or 6 00 ohm line mellsuremen t s .

Coupli ng cllpa c i to r s Cl an d C2 prevent dc vo ltages, wh ich may bep r e s en t on a l ine, from interfer in g w ith th e in strument ci r c u itry .T he s ig n lll i s app l i"d to th e i n st r u me nt a mp lif ier v ia cal ib ra t" d 2dB / s tep r o t a r y attenua tor R3, re s istor R4 a nd coup ling c lIPllc itorC3. Th e Cllli brllted II tt e n ua tor accom mod ates li n 60 dB range anda llows t h e M405 to mea sure i npu t levels f r o m _50 dBm t o ' 30 dBm fora 0 Vu me ter r e a ding .

Clippin g d io d e s CRt an d CR2 in co n juncti o n w it h R4 limit t he s ig n ali n p u t a mp l i t u d e to t h e amp lifier a n d mete r c ir c u i tS . 01 FET lind 0 2P NP transi stor fo r m a v ery h ig h i mp e d a n ce compleme nt a r y p r e_ am pli_f i e r . Hence , th e ca l ib ra te d poten tiomete r , R3 o perates un loaded . Thepreamplifier ga i n is de term ined by t h e r ati o o f r e s is to r netwo rk s R9to RIO a nd RII or R9 to R12 and R I 3 depending on t h e s e lec t ion ofi mp e dll n ce sw i tc h SW2 . T h is prod uces a simul taneous 6 dB g a i n~ci~u~~::~t when t h e ma tching i np ut i mp e d a n c" is s" l"cted to ISO or

T h" p reamplif ier o u tput is v ia c apacitor C5 . The outpu t a mplif iercompr i ses t r a n s i s to r s 0 3 t h r o u g h 07 . The c ir c ui t i s an op e rationa lIImp lif ie r f u n c t io n in g i n th e invert i ng mode and w i th fee d b a c kr e s i stor s R14 and R22 d e term in ing the g ain . Fi lter sw i tc h SW3 i n s e rt sa para ll el T-t yp " f i l te r , compr is ing r e si stor s R15 through R2 1 andcllpac itors C6 t h rou gh C9. Th e f i l te r produces a sha rp 60 Hz n ot c hw i th g r e a t e r t han 30 d B a t tenua t ion . Locat i ng th e f i l t e r- compon ent swi thin th e feedback loop produces h igh - O respon s e c ha racter i st ic swith 3 d B points a t SO and 70 Hz.

C IRCU IT OESCRIPT ION

M405 PORT ABLE EXTENOED RANGE VU METE R

OUlput coupling capacitor C I I connects lhe s igna l to the VU me tervia s wi lc h SW4. Re l is lor RJ 3 provide s Ihe required ,.OUf"'Ce dri v ingimpedance, wh il e R34 and CI3 in t roduces high frequency compe nsa tiont o re" tore me Ie r rK tHier resees . Zen er diode,. eR 9 and CR 10 offerp ro tK t ion Ilga i n s t me te r overdrive . Headse t j ack J5 de l iv er s Ilppro><_ime tely 0 d 8 m to a 600 ohm loa d whe n me te r MI Ind ica te s 0 VU.

P r i ma r y aC pow er Is IlPp lied 10 the i n s t r u me n t vi a t he Ihree po s it ions wi tc h SW4. Th i s mul t i -deck fu nc t ion s wit c h d ;" c onnect s li n d IIPplie sde pow e r from t he b a uery com p lemen t to Ihe IIc t ive me ter Ci f"'Cu i l ry .

Wh en selected to t he BATTERY TEST po s ition, SW4 Ilpplies a le s t loa dto t he ba ttery ci f"'Cu l t and prov id e s a visua l indicll i ion of theba t le ry condi lion Ire fer 10 Operation s ec li on l .

Tr a n sforme r Tl, tr ll n s i" tor 08 and a s soci a te d ci r c u il ry c omp r ise acons t" n t cu r r e n t c h"rger . Wi th SW4 s e lec te d to th e ON p osit ion IlC i l"ppli e d to T l and a de vo lt age is produced v i a re c t ifiers CR?, CR8and fil te r c ll pac i tor C lio . Tr a n s isl o r 0 8 d eli vers " con ,. tan l 8 rnAemi lter c urr ent via iSOlati n g d iod e CRS 10 charge t he n ickel cadmiu me eus • Wh.,., I he cha rgi n g proc e s s occ u rs , neon i nd ic a tor 051 i llum_in ates to prov id e a v isua l indica tion o f t h e c h arg ing mod e.

WAR C- B E CK B Y BTEMS L T C .

OPE RAT IONAL OESC R IPT ION

M405 PORT ABLE EXTE NOEO RANGE VU METER

( Ref e .. 10 F r-onl (, Rea .. Layoul B4 05 - 00l0 - 00I )

"arJI

' J

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7l

Ch a " g e I n di c at or i" l i t du .. in g b atle .. y c ha rg i n g .

OFF / ON/ TEST swi l c h (S W4) a c ti v a t" " t h" in strumen t in Ih e "ON"po si tion by a p p lyi ng po wer fr'Om e i l her Ih e in te rnal b atle r ypack or from t he AC l i ne .In a d d i li o n Ih e batle r y cond i t ion i " mea su ...e d in Ih e "TEST"posi tion . Sufficient ch . ...g e 15 ind ica ted b y • need le def lec li onin to th e ...e d colou....,d ..egion of lhe VU mete.. se e te ( 0 10 '3) .

150/600 Iln(le d a n ce S ... ilC h f SW2 ) compen5llle 5 Ih e meI er in d iC. I_ion for vo l l a ge p ..e sen l al l he inpul le nn in a l .. w hoe<> l hein .. I"' umenl '5 con nec te d 10 r ead aCros s a 150 or 600 otvncirculi . For e"amp le, • 0 VU level wou ld norma ll y r ead 6 dBlo w" r wh en Ih e in .. lrumenl ...a .. connlPCl ed 10 a si g n a l d eve lopeda Cross • 150 o hm l "'a n 5m l 55 ion l ine I h a n it i l ...a s connec ledaCros s a 600 ohm line. By s e l ec t i n g SW2 10 Ih e knownI r a n s m ls s io n line impedanc e a dire<;1 s ca le reading may beo b t ai n e d wit ho u t Ih e n .... d for co .. rec lion ' a CIOr S .

20K/ MATCH .. witch (S W1) se l ec t s a brid gin g Or match in g i np uta l Ih e In p ut le rmin<l15 o f t h e M4 0 5. Th e b .. i d g i n g mo de is fo ru s e ... i l h te r mina te d t r a n s m i s s io n l in e s and wh e r e in l ro d u c t iono f I h e me ter to t h e s ys te m is ..e q u ir e d n o t 10 load t h e c ircu i t .Th e ma tching mode , s for uSe wh en Ih e s en d i n g line isunloaded and, Ih .....e fo ..e , ..e q u i r e s a l erminalion to p r o d u ce teed e s ig ned 5 y5 1..... le v e l .

F ILTER " .. i tc h (S W) ) , n serlS II 60 Hz n ........... ban d reje<;ti onnotch wIt h i n th e me ter a mp li fie r 10 min imize Ih e (Off ec l s o f hu mp ..e 'Senl ... l l h l he sl g n .1 10 be measured . Th u 'S, Ih e possibi li l yo f e r ror due 10 the pre senc e of a 60 hz h u m comp on enl In l h eci<'Cuil Is e limated .

INPUT bind ing po.5t lenn in a ls . A .. ignal sco ec e may either beconnecled 10 these l ...-m i n ll is 0 .. 10 Ih e le lephone I y pe inputjack (see 8 ).

WARO - B ECK B YSTEMS LTO .

OPE RAT IONAL DESCR IPTION

114'05 PORTABLE EXTENDED RANGE VU METER

8) An Inp u t connlN: led 10 th e mei er v i .. t he te lep hon e type inputj .. "k " u tomalic" lly d i s con n lN:lS t he b i nd ing POSI termin" ls fromt he in pu t c i r c ui t .Th e 114405 in pu t offers a fl oa li ng i np u t 10 th e s ou rce . The b od yof th e te l ephone j ""k and th e g r ound bind in g po,", t e r mi na l a recoonectec to t h e c h " s sl s grou nd of th e In s t r u me n t .

9) A he "dSet may be "onn tN;ted v ia OUlput tel eph on e j "ck J5 Inorder to l i st en to I he p r o gr a m t r a n smi s s io n lIn d to Id e n t ify Ihemet er Ind lc" t lon . In a dd iti on, thi s ""tpul sou rce offe r .. Ihecapa b l i l l y o f d r ivin g a 600 ohm li ne 10 appro><im"tel y 0 d Bmand h e nc e adap l s Ih e 114405 for boos ter a mp H fie r app lica t iOluwith a visu al indica l io n o f pro g r .. m Iransm i s s ion . Low le velinPUI sI g n als from _!>O dB l'Il ma y be a djus led v ia Ihe /l44OSamp lifier ci rc u i l to produ ce 0 d Bm " I JS ou tpul .

10 ) Calibrllled ROl a ry All enua to.- (RJ ) con l ro ls the r ange of t hein Sl rument. ' 0 5teps <Ire provided , wil h cIolenlS , a n d Ihe pot ­en ti ome le r is <lrrll n ged to atte n uale in 2 d B/s tep incr~ents .

The in s lrument p <ln e l i s en graved 10 indica te t he co rreoclion11'1,,, i s a d de d 10 Ihe met er in d ica tion to ob tain t h e VU levelr e a d i n g for th e c ircui l of in t e r e s t . Le v el s from - SO d Bm to+30 d Bm are accommoda ted and produc e a 0 VU rea d i n g .

It ) AC r e<e p t a cl e. Con nKt pow er co r d to recha r g e b a t t er y pack .

WAR e-B ECK SYSTE M S LT O .

"1405 PORTABLE EXT ENDED RANGE VU METER

Th e M405 is de sign ed fo r depen d a bl e , lrou bl e-free s e r v ic e . Howe ver,as wilh all h igh q u alit y e l ect r on ic eq u ip me n t , a regul ar s ch ed u le o finspec t io n s h o u ld b e e s t a b li s h e d . Any a c CUmUl lll ion of du sl s houl d bep eriod ic a lly remo"ed with a so ft brus h a nd a v aC u um ho s e.

Th e a c ti ve circui try ma y be in specl e d by r e mo v i n g th e in slrumen lfront pane l . Remov e Ih e t wo 4_40 sc rewS on top a nd I wo ru bb e r feelli t the bollom th ai Se Cu r e th e frO nl p anel to th e meter case .

The compon ent board may be re mo ved fo r i n SP fCCl ion by removing t h elw o nut s wh kh se cure Ihe PC board to th e me ter te rmi n a ls . In l h i smanne r a cce ss may b e g a i ned 10 Ih e so l de r s ide o f l he PC bo ard.

If il i s n ec essar y to r em o v e o r in st a ll b atte r ie s , relea",," t h e ba tte ryc la mp . Discon nec t the ba tte r y le r mina l c lips a n d r e mo v e b a t te ri es .InS l a l 1 ne w u olts a n d s ec u r e b attery c1 l1mp by r e -Iocllt ing th e 4 _40rela i n in g screws . The r elai n ing sc r e ws lap i nlO th e met e r s i de P ll n e l .

If a t a ult i s s uspec l ed , measur i n g th e d c vo l tage p resen t a t t h et ran s is lOr el ec tro de s may ass i s l to de te r mine l h e ca u se. Wh en co mpa r ­ing th e me " " ur"", en t s li st ed i n t h e vo l ta ge c h"' ·t co n si d e r a t ion s hou ldb e g iv en to I he f llCl Ih llt , for d i r ec l coup led s ec t ions , a fa u l t i n o n eci n:u il ma y CauSe abnormal condi tions i n o t he r ci rc uit IIreas withi nth e s a me se c t ion .

If i l is necessa ry to i n terch a nge a co mp o ne nl to dete r mi n e t h e ca us eof a fa ul l , r emov e t h e s us p ec led co mp on e n l w ilh a s ma l l so lderi n giron a n d a d e solde "ing too l . P lace I he so l de r in g ir o n a nd t h ede s o lderin g tool on t he sol de r con nec tio n 10 b e ee sc tee-eo . Wh e n t h es o ld e r mells Ihoroug h ly , p re s s Ihe plung e r r e l e ase l r i g g e r . If any ofI he lead co nnec tion s s t iCk to l h e pr in te d c ircuit boa r d , fre e t h e mw ith a sc r ibe Or a s imil ar s h a r p ly poin te d i n str umenl. Ca r e fu l l yre mov e th e com p o ne n t w h ich , if prov en 10 b e sat is f ac to ry, may beused aga in for o th er a p p l ic a t io n s .

To in slal l t h e n ew componen t , s hap e l h e le a d s 10 t h e corre cts pad n g . In s erl tb e part a nd fo ld Ih e le a ds u n d e r Ihe p r intedc in:u il b oa rd to f irml y h o ld t he componen t. Cl i p off me exce s s wir ele a v: n g a b o w 1/ 16 inch . So lde r th e n"w l ea d s , usi ng r e si n Coresolder and c le a n n-e bo ard wi l h a n incr! f lu id such a s p erch ­lorelhely ne.

The loc atio n o f comp onen t s i s s h o w n in d rawi n g 8142_06_001 .

WAR D-B E CK S Y STEM S LTD.

OC Voc. TAGE CHART

""405 PORTABLE EXTE NDEO RANGE VU ""ETER

I . Ka si g nal applied .

2 . Unit tur- n e d on w il l'l no a C pow er app l ie d whenme a suring Cl to C7 . AC pow er appl ie d andc l'larger OPera l lng .. l'Ien me tlsur i n g C8.

J . Bti ll ery vo l t a g e 22.5 va I lS .

BAT TERY CURRENT DRAIN lno si g na l applied) 1. 25 mA

Ka le: Will'l charger operat ing b all er yr eversed and sl'lou ld measure 7.8 rnA +/_l QS.

WAR D-I!IECK lIye T E M B l.TD.

~

M. OS EXTE NDED RANGE VU MET ER

DESC RI P TI ON _ !::lFG PAR T NU",~

Belle" y Nic k e l Ce d m ium 9 V Ou ..a cell

Cap~cllo" 2 . 2 uF/2~O V P h :,l i P S 341 ~49_22S

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0.047uF P h :!i p "O.047uF0.047u F0.047u F10 uF /2'!JV

n uF /2S V T39OE.76M025A5100 u F/2S V P h i l i p s .26ETFloo. 700 pF A.... le o CQ92-MC-l(l()....1072M100 uF /40 V Ph~l i p s 426 ETGloo

0.' uF /lOO V )4451104

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SLD853_R

W A R O· B E C K S YSTEM S LT O .

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M. 05 EX TENDED RANGE VU MET ER

Sme 11 KnobBl a c k Cap

La rg e Kn obB l ac k Ca pSkirt

MFG PART NUMBER

023-.520c.O-4620

02 1-5520040 _5620042 . 5920

c tcaOJ

0'0'0<>

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2N51632N50872N440 12N440 12N5OO7

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All 25K .0 POS; I;on 2 dB step Sha lt co

R"s;,~ tor 1/ . ~I : ~ Ph,;} ; ps

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"' 405 EXTENOeO RANGE VU METER

DESCRIPTION

' " Re " istor 1/4W 51 620 Ph i lip..era 620

"" Trim Pol SOO P i her

"" Resi stor 1/ 4W :5I " Ph il ips

"" '"'" ""' " ".'18 Tr im Pol 21" P i he r

'" R.."is to r l /AW S'lj '" Philips' 20 aoc

'" Tr i m P OI '" P ih er

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'" lW sl '"aae I /2 W 5' 620

'" """ '"' W, Sw i tCh T,~9 91 .. SPSTSW, OPDlSW, SPSTSw. Rotary

"'FG PART NUMBER

PTlOV_500

PTlOV _20K

7 10112017 101PA2007

WAR D · S E CI< SYSTEM S L.TD .

~

M40S EXTENDEO RANGE VU METE R

DESCR IP TION

Po wer Transf or mer

MF G PART NUMBER

Fuse C li p

Ball.~ ry C!,i P

Pow er Cord

l ittl e fu s e 357001Duracel l 0483

was r eeommen d s t he u s e o f rep laceme n ( p aris made b y th e s peci fi edmanufa c tu r e r s fo r con t inued optimum e q u i p me n t p erforma n ce .

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100/2 S

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+22 . 5V - ---r- -,- - --- -

1~ CRI ·1....4 148

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100/:25

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I . AL.L. RESISTORS 1/4W 51 ANDALL. CAPACITORS ARE IN oFUNl..ESS OTHERWISE SPEC IF IED.

:2. L.AST COMPONENT D£S IGNATIONS ,Cle , CRIO. DS1 , Fl . QII , J5R4I , S.4 (, r r ,

3. I'll _ SI,", Auenuator-(40 posIt ion, :2 dB / $ I,",) .

(was) WAAD--.cK~

M406PORTABLE EXTENDED RANGE VU METER

SCHEMATIC

B 406-02-001 ISS. 1

0-----...2-11

~=======:..j

e

11

(was) WARD-BECK SVSTEMS

M405PORTABLE EXTENDED RANGE VU METER

FRONT & REAR LAYOUT

B 405-04-013 155.1

C14 ~

_ R33~9 _ R31 !.!Sl

_ RJ4 1§.K _ R32~'- 0o 0

_ R36 ~6

-R29 ~ - R30 ~

..... CR9 7* A -CR ~~7~

- C 1 2~

CI34700P

- R35~

- R37.lM'..... CR5~OO3

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