《Bogen-System-Design-Manual 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Bogen-System-Design-Manual 电路图 维修手册.pdf（15页珍藏版）》请在收音机爱好者资料库上搜索。
1、www.bogen .com 63 SYSTEM DESIGN GUIDE SYSTEM DESIGN B og en created th e System D esig n Guide ( pag es 6 4 - 7 7 ) to h elp you to understand h ow a pag ing system works and h ow to set one up. I t is f illed with h elpf ul inf ormation and ref erence material th at is sure to h elp answer your que
2、stions about centralized 7 0 V amplif ier and 2 4 V self - amplif ied systems and products, h ow and wh en to use th em, and h ow to correctly set th em up. A ctually, all you need to desig n a proper pag ing system is a f ew simple measurements. Th en f ollow th e step- by- step process to select t
3、h e type and quantity of system components needed. A t any point you can contact B og en s toll- f ree Tech nical Support D epartment f or assistance, or take advantag e of B og en s Free A pplica- tion D esig n Service ( see pag e 8 2 ) . INDEX : Pa gi n g Sys te m Te c h n ology (In trodu c ti on
4、). . . . . . . . . . . . . . . . Pag e 6 4 70V Sys te m s (Ce n tra l Am pli fi e d). . . . . . . . . . . . . . . . . . . . . . . . Pag es 6 4 - 6 7 Wh at is a 7 0 V System? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 4 Wh y Use 7 0
5、 V Outputs? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 4 Wh at Makes a 7 0 V Speaker? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 5 A mplif ier Output Types . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 5 A mplif ier I nput Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 6 D esig ning 7 0 V Systems . . . . . . . . . . . . . . . . . . . .
7、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 7 A mplif ier Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 7 24V Sys te m s (Se lf-Am pli fi e d). . . . . . . . . . . . . . . . . . . . . . .
8、. . . . . . . . . Pag es 6 8 - 6 9 Wh at is a Self - A mplif ied System? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 8 Wh y Use Self - A mplif ied Tech nolog y?. . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 8 Wh at Makes a Self - A mplif ied Speaker?
9、. . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 9 D esig ning Self - A mplif ied Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 6 9 Spe a k e r La you t. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10、 . . . . . Pag es 7 0 - 7 1 Si te Su rve y. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 7 2 Si te Su rve y Ch e c k Li s t. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11、. . . . . . . . . . . . . . . . . . . . . Pag e 7 2 Spe a k e r Wi ri n g. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 7 3 Spe a k e r Ph a s i n g. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 7 3 Wi re Type s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 7 4 Wi re -Re la te d Los s e s. . . . . . . . .
13、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 7 5 Te le ph on e In te rfa c e s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 7 6 Sou n d Pre s s u re Le ve ls Ch a rt. . . .
14、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag e 7 7 Boge n Sys te m De s i gn Gu i de De s i gn Y ou r Own Sys te m s Le a rn De s i gn Pri n c i ple s Ma s te r th e Ba s i c s of Pa gi n g Sys te m Te c h n ology Un de rs ta n d th e Be n e fi ts of b oth 70V a n d 24
15、V Sys te m s RadioFans.CN 收音机爱 好者资料库 70V Paging Systems co nsist o f: A Cen tral ized Amp l ifier wh ich of f ers a variety of f eatures to enh ance voice and music reproduction as well as easy system expansion. Sp eakers th at connect with a simple 2 - wire installation because th e audio power is
16、supplied f rom th e central- ized amplif ier. An In terface Device th at connects th e pag ing system to th e teleph one system. ( D epending on th e teleph one system and amplif ier, an interf ace device may not be needed. ) Th e aim of a pag ing system is to deliver important audio announcements,
17、at th e proper level and with suf f icient clarity, to people working in a f acility and to make th ose announcements easily understood. Th e two most common ways to accomplish th is are to use eith er 7 0 V central- ized amplif iers with passive speakers or self - amplif ied speakers operating f ro
18、m a 2 4 V D C power supply. Pag es 6 4 - 6 7 explain 7 0 V systems and pag es 6 8 - 6 9 explain self - amplif ied systems. Speaker layout, wiring meth ods, and ph asing are th e same f or eith er tech nolog y and are covered on pag es 7 0 - 7 6 . Central-Amplified Systems - pages 64-67 Self-Amplifie
19、d Systems - pages 68-69 Power Lost In Wires (Watts) Resistance of Wire (Ohms) Current Flowing In Wire (Amps) P = I 2 * R Current Flowing In Wire (Amps) Amplifier Output Voltage (Volts) Power Needed By Load (Watts) I = P/V www.bogen .com 64 SYSTEM DESIGN GUIDE PAGIN G SYSTEM TECHN O L O GY WHAT IS A
20、70V SYSTEM? WHY USE 70V O UTPUTS? L o w Currents Al l o w L o ng Runs Wh y do distributed sound systems use centralized ampli- f iers with 7 0 V output sig nals? B ecause 7 0 V systems can h andle extremely long leng th s of wire to connect th e speakers to th e amplif ier, and th ey can power a lar
21、g e number of speakers in each system. Wh en sending power sig nals over long distances, it is im- portant to minimize th e amount of current f lowing in th e wire. H ig h currents allow too much power, or electrical en- erg y, to be wasted in wires in th e f orm of h eat. Th e power ( P) lost in th
22、 e wire is related to th e square of th e current ( I ) , so reducing th e current in th e wires a little reduces th e power lost in th em considerably. I n f act, reduc- ing th e current f lowing in a wire by a f actor of 2 will reduce th e power loss by a f actor of 4 . H owever, th e power th e l
23、oad demands and th e output level of th e amplif ier determine th e amount of current th at must f low in th e speaker wires ( Oh m s law in action) . So to lower th e amount of power lost in th e wires, th e voltag e th at th e amplif ier uses to drive th e load is increased. B y doing th is, th e
24、current in th e wires can be reduced wh ile still supplying th e same power to th e load ( f or th e same power P, any increase in V will lower I ) . Of course you cannot just ch ang e th e voltag e driving a load f rom one level to anoth er with out also making th e load compatible with th e new vo
25、ltag e level. To ensure compati- bility, 7 0 V systems use transf ormers on th e speakers th at ch ang e th e h ig h 7 0 V amplif ier output levels to lower levels th at are compatible with typical 8 - oh m speakers. Easy To Co ntro l Speaker Po wer Draw Th e output of a central pag ing amplif ier i
26、s desig ned to limit th e maximum output voltag e th at can be supplied to th e speakers. Th is maximum output voltag e remains th e same reg ardless of th e amplif ier s power capacity. B ecause th e output voltag e is limited, speaker manuf acturers can desig n products th at consume a specif ic a
27、mount of power f rom th e amplif ier. Th is is benef icial in two ways. First, th e speakers will not consume more power th an th ey are desig ned f or; so, th ey cannot blow out f rom using an amplif ier th at s too powerf ul. Second, since each speaker s power consumption is known, th e correct am
28、plif ier power f or th e pag ing system is simply th e total power consumed by all th e speakers. RadioFans.CN 收音机爱 好者资料库 70V O utput A 7 0 V output is available on B og en amplif iers and is th e primary type of output f or pag ing systems. A step- up output transf ormer in th e amplif ier provides
29、 th e h ig h 7 0 V output sig nal. A ll speakers with step- down transf orm- ers( rated f or 7 0 V systems) are connected to th is output. O ther O utput Types (25V, 16- and 8-o hm) Th ere are a number of oth er standard speaker imped- ances th at B og en amplif iers can be connected to. Th ese outp
30、uts provide th e correct speaker sig nal level f or dif f erent conf ig urations of low- impedance speakers. Th e lower voltag e ( 2 5 V) output is provided on many B og en amplif iers f or use in pag ing installations th at require a speaker voltag e of less th an 7 0 V to meet building code requir
31、ements. Direct O utput D irect outputs are used with low- impedance speakers. Th ese outputs h ave an exceptional low f requency ( bass) response, providing th e f uller sound th at low- imped- ance speakers can reproduce. C ertain B og en amplif iers, desig ned f or g eneral purpose sound reinf orc
32、ement applications, include th is f eature wh ich allows th e step- up output transf ormer to be bypassed f or direct connection to th e power amplif ier s output. Step-Do wn Transfo rmer 7 0 V pag ing speakers h ave a step- down transf ormer, wh ich is used to convert th e h ig h - voltag e/ low- c
33、urrent amplif ier sig nal of th e central pag ing amplif ier to th e low- voltag e/ h ig h - current sig nal th at speakers use. Taps Th e primary side of th e step- down transf ormer (the s ide that co nnects to the amp lifier ) h as a number of connections (called tap s o r p o wer tap s ) th at c
34、an be used to select th e peak power th e speaker will con- sume f rom th e amplif ier. Why Taps? Th e selection of th e power tap h as an ef f ect on both th e amplif ier power needed f or th e system and th e volume of th e speaker. Th e more power a speaker consumes, th e louder th e sound f rom
35、th e speaker. B y tapping speakers f or lower power in quiet areas and f or h ig h er power in noisier areas, th e sound level of th e pag ing system can be controlled and balanced. I t is important th at speakers be tapped correctly f or th e area th at th ey will be used in. Setting all th e speak
36、ers f or th e same power reg ardless of th e amount of noise in dif f erent areas will cause balance problems. I f th e amplif ier is adjusted to produce adequate pag ing levels in th e noisy areas, th e pag ing levels in th e quiet areas will be too loud or vice versa. Selecting th e proper tap set
37、- ting is not dif f icult, but it does require knowing th e level of ambient noise in dif f erent areas. ( See Sound Pressure Levels C h art on pag e 7 7 . ) I t is always better to use th e next h ig h - est wattag e tap if th ere is any doubt about th e speaker being suf f iciently loud f or th e
38、area. Of course, th e best way to determine h ow ef f ectively a system covers an area is to test it. Never install a pag ing system and leave th e site with out testing it. Sound adjust- ments or additional speakers may be needed. Some pag ing equipment, such as B og en s PC M2 0 0 0 , UTI 1 , and
39、UTI 3 1 2 pag ing interf aces include a test tone th at is sent to all speakers in th e system so installers can ch eck th e system installation. For oth er systems, th e installer can h ave pag es made wh ile th e installer walks th e area to listen f or appropriate sound levels and unif orm covera
40、g eof th e system to f ind out if and wh ere adjustments need to be made, and to make sure th at all speakers are properly connected. Easy DesignWitho ut Taps To make desig ning pag ing systems as easy as possible, B og en of f ers a line of Easy D esig nspeakers. Th ese speakers do not require tapp
41、ing and allow f or on- th e- f ly adjustment of speaker pag ing levels. A ll th e inf ormation th at is needed to desig n a complete system are th e dimensions of th e dif f erent pag ing areas and th e type of environment. With th is basic inf ormation, you can use th e Easy D esig n speaker line t
42、o quickly desig n a robust, prof essional, and powerf ul pag ing system. ( See pag es 1 5 - 2 1 f or more inf ormation. ) www.bogen .com 65 SYSTEM DESIGN GUIDE WHAT MAKES A 70V SPEAKER? AMPL IFIER O UTPUT TYPES RadioFans.CN 收音机爱 好者资料库 Auxil iary Input (AUX) Th e A uxiliary input is th e most common
43、type of input used in pag ing . Th is input is desig ned to connect to most music sources, such as a C D player or tuner. Usually th e connector f or such an input is a Ph ono jack ( also called an RC A jack) . I t connects to oth er equipment using stan- dard audio cables. Th e A UX input h as an o
44、uter connection th at is directly con- nected to th e equipment s g round and a center connec- tion th at is th e “h ot” input. A UX inputs, sometimes ref erred to as H i- Z or h ig h - impedance inputs, h ave a h ig h input impedance so th at th ey won t put too much of a load on th e source equipm
45、ent s output. Th is type of input is “unbalanced” . You must use sh ielded cable with th is type of input in order to avoid g etting noise induced into th e system. Normally, connections between source equipment and th e amplif ier s A UX input sh ould not be too long , about 6 f eet. Th e problem w
46、ith long connections is th at th e cable acts like an antenna, picking up any electrical noise in th e area. Th e long er th e cable, th e more noise th at is picked up. Tel epho ne Input (TEL ) Th e TEL I nput is so named because it was desig ned to be compatible with pag e port outputs of teleph o
47、ne systems. Th e TEL input is a 6 0 0 - oh m transf ormer- coupled input th at: match es th e impedance of th e teleph one port to provide proper interf acing electrically isolates th e amplif ier f rom th e PB X or Key System provides a balanced input with a g reat deal of noise immunity B og en s
48、TEL inputs do not h ave to be sh ielded, but it is al- ways a g ood idea to provide more noise immunity ( nor- mally a g round terminal is available on th e input f or th e sh ield connection) . H ig h er noise immunity allows th e am- plif ier to be located much f arth er away f rom th e source equ
49、ipment th an wh at an unbalanced input will allow. Th e input transf ormer is not desig ned to pass loop current f rom a teleph one line. A ny time you want to connect to a teleph one stationor trunk port, you will need to use a tele- ph one interf ace module like th e TA MB 2 , wh ich converts th e teleph one sig nal into a “dry” audio sig nal compatible with th e amplif ier s TEL input. Micro pho ne Input (MIC) Th e traditional pag ing amplif ier input is th e Microph one input. MI C inputs were th e primary announcement source until connection t
免费区 
