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Forumas » Elektronika žaliems » Galia ir jos matavimo vnt...
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Puslapis 1 iš 2 Pereiti prie 1, 2 Toliau |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 23, 02:20 |
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plz, kas nors paaishkinkite, kurie W yra "tikrieji" W? Nes pasiziurai i s90, ten parashyta kad ju galia yra 35w, o pasine 90W. Nuejes i gariunus pamataij chiurku surinkta centra uz 0.5k LT, kurio galia 2.5kw.... ?!? Kas yra tas peak power, pasine galia ir t.t... Kaip supratau taij cia vos ne kiekvienas pasaulio zhemynas turi savo atskira supratima apie galios matavimo vnt... Labai buciau dekingas uz ishssamu paaishkinima ir kaip apsiskaiciuoti W ish vienu i kitus (na ish tu "kosminiu" 2.5kw i normalius).
Ish anxto aciu uzh atsakymus! |
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_________________ eyeamcomputer |
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Re: Galia ir jos matavimo vnt... |
Parašytas: 2004 06 23, 10:22 |
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klausimas neblogas. vardine galia (RMS) tai kokiai galiai yra apskaiciuotas pvz.garsiakalbis, pasine galia tai yra maksimali galia kuria gali atlaikyti garsiakalbis, tie PMPO tai yra vatai is lempos arba kazkokie muzikiniai vatai kurie velniai zino ka reiskia. galia apskaiciuoti paprasta: issimatuoji stiprintuvo isejimo itampa,kai prijungta pastovi varza - ne garsiakalbis! tada itampa keli kvadratu ir dalini is apkrovimo varzos |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 23, 15:03 |
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as tai esu kazkur girdejes kad tuos PMPO watus reikia padalint is 11 ar dar siek tiek daugiau kad gautum tuos tikruosius watus... |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 24, 12:25 |
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nei is 11 nei is 7 padalijes negausi tikru watu,nes kiekviena karta tas santykis buna kitoks |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 25, 00:04 |
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Sveiki norejau paklaust ar imanoma pagal stirpintuvo masininio vartojama srove nustatyti stipro watus. Va pas draugo yra stipras ir naudoja 6.4A prie galingumo kuri velka ir neplerpia tai kiek mzdaug ten watu tame stipre(stipras samadelkinis nieko neuzrasyta)
aciu  |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 25, 02:03 |
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Jeigu naudoja 6.4A tai padaugink is maitnimo itampos kuri yra apie 13V
gaunasi 83 W tada ivertini stiprintuvo viduje esanti maitino bloka, (jeigu ten toks yra) paprastai jis yra apie 80 %, tai 83 * 0.8 = 66.4
tai realiai turetu buti apie 60 W, jei ten du kanalai, tai 2*30, jei 4 tai 4*15W.
Turetu buti mazdaug taip. Cia aisku dar dasideda galios nuostoliai pacio stiprintuvo, nes ne visa galia tenka kolonelem. Dalis galingumo kaitina galinius tranzus Bet grubiai primetus tai turetu buti taip |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 25, 09:00 |
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na cia dar nuo stiprio klases daug priklauso, jei A klases tai tu vatu bus labai nedaug, jei AB daugiau, o D klases gali but ir labai daug. |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 25, 09:03 |
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tingiu tik verst i lietuviu, bet kas labai nores turetu susigaudyti:
PMPO stands for Peak Momentary Performance Output. It is a dubious measure of the power output of a loudspeaker of more interest to advertising copy-writers than to consumers. The PMPO is calculated by the vendor or tester of the speakers as the maximum power in watts under perfect conditions that are impossible to achieve in practical use. No sound system can sustain its PMPO for more than a few milliseconds without being destroyed.
A much more serious and reliable measure is watts rms. Rms stands for root mean square. The rms power is found by averaging the instantaneous power output over a long period of time.
To get an idea of the relationship between PMPO watts and watts rms, consider the following numbers advertised for some current loudspeakers. These models have been selected at random, and inclusion in or exclusion from this list is neither a recommendation nor a criticism.
Teac PM-100 3D surround-sound speakers: 16W rms, 180W PMPO
Kinyo "200W" PC speakers: 3W rms, 200W PMPO
Philips Fun Power Plus MMS-102 PC speakers: 10W rms, 120W PMPO (however, the Philips data sheet mentions only the rms value; the PMPO value is claimed by retailers)
This list shows that PMPO figures are hugely exaggerated compared with the rms values used by professionals.
AC power, which includes audio, is rated in watts rms, which is equivalent in heating value to DC watts. This is the honest method. A given direct coupled amplifier (transformers are rare in non-distribution equipment) can obviously only swing its output from ground to VCC at best. This limits a simple car amplifier to something like a 12 volt swing peak to peak.
For example, an ideal (100% efficient) amplifier with a 12 volt peak-to-peak supply can drive a signal with an amplitude of 6V. Into an 8 ohm loudspeaker this would deliver
6V x 6V / 8ohms = 4.5 watts peak instantaneous.
If this signal is sinusoidal, its rms value is 6V x 0.707 = 4.242 V(rms). This voltage into a speaker load of 8 ohms gives a power of :
4.242V x 4.242V / 8R = 2.25 watts(rms)
With a 4 ohm speaker these figures double. You can see which the marketing person wants to use. You can also see why some car audio uses 2 ohm speaker loads.
With a differential (push-pull) output the swing is doubled so the power increases by a factor of four. Therefore, with a 14.4 V supply, which is the highest voltage usually available from a fresh car battery, the maximum possible output into a four ohm speaker is about 14.4 x 14.4 x 0.707 / 4R or about 46 watts rms.
"Music Power" is a somewhat arbitrary multiplier based on the fact that amplifiers cannot provide full power for long, but can produce high power in short bursts. This allows them to reproduce normal audio, which has a high peak-to-average ratio.
To get more power, high-end equipment uses a DC to DC converter to generate a higher supply voltage (at the expense of drawing more current from the battery).
The true power output of an amplifier can be estimated by examining the DC input. Linear amplifiers tend to be about 60% efficient at best. An amplifier labelled "500W PMPO" but fitted with a 5 amp fuse can therefore deliver an average power of 5A x 14.4V x 60%, or about 43 watts |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 25, 14:48 |
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Kaip supratau RMS tai yra maximali galia (pvz RRR s90 pasine [vardine galia] arba RMS yra 90W) , kuria atlaiko dinamikas.
PMPO - kazkokia kosmine galia, kuria sakyciau gamintojai parasho ish lempos nes shitos galios realiai ishgauti neimanoma.
Aciu uz paaishkinimus. |
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_________________ eyeamcomputer |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 25, 15:20 |
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tame angliskame tekste yra pasakoma,kas yra tie PMPO, o pvz tokios kaip S90(seno modelio) RMS yra 35W,o Pmax yra 90W |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 26, 11:22 |
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rms yra ilgo (atsizvelgiant i dazni) laikotarpio galia. tipo suvidurkinimas. pmpo yra grynai momentine galia, kuri kiekvienu momentu yra skirtinga ir jos reiskmes skiriasi smarkiai. |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 06 27, 00:38 |
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Senuose S90 gulejo 35GDN tai ir buvo 35W
o S90D maciau stovi 75GDN - tai norite pasakyti vistiek RMS=35W
nesamone butu man be jokiu barskimo tas 75GDN tikrai laiko 75W
na jau veliau prasideda sunkus atsidusimai |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 07 02, 11:15 |
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nominaliai naujoji S90 su 75ZT ar 75GD laiko 75W, o kiek maksimaliai tai neaisku. kai kurie sako,kad prie 150W pradeda saudyti,kiti - 100W.....  |
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Galia ir jos matavimo vnt... |
Parašytas: 2004 07 02, 11:30 |
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jei stipriako galia 100, tai ir saudys kazkur ties 100W (o gal tesiog nebelaiko klausa???)
pas mane 120W tikrai stipra atiduoda, tai nesaudo, o jei atsuki daugiau tai jau pats stiprintuvas neistengia graziai uzkurti - karpo sinusus ir gaunasi kad barshka
ir zinote, ilgiau pasitusini prie galios 8] ir galima pastebeti kad jau eina lygtai kliju kvapas nu bet gal tik man senai jos taip nedirbo
ir vat klausimas:
jei stiprintuvas groja mazdau 2x200W (groja abi kolonkes) tai ji is 220W tinklo traukia 400W??? |
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