Crown-audio PT 1.1 Bedienungsanleitung PDF herunterladen

Crown International

P.O. Box 1000

Elkhart, IN 46515-1000

TEL: 219-294-8200

FAX: 219-294-8FAX

www.crownaudio.com

PT 1.1

10/01 133810-1

For more details refer to the applicable Reference Manual or

Contact Crown Technical Support. The provided data should not

be construed as speciﬁ cations.

Crown is a registered trademark of Crown International.

Printed in U.S.A.

AC Power Draw and Thermal Dissipation

POWER-TECH SERIES

This document provides detailed information about the amount of power

and current drawn from the AC mains by the PT 1.1 ampliﬁ er and the

amount of heat produced under various conditions. The calculations pre-

sented here are intended to provide a realistic and reliable depiction of

the ampliﬁ er. The following assumptions or approximations were made:

• The ampliﬁ er’s available channels are loaded and full power is being

delivered.

• The ampliﬁ er efﬁ ciency at standard 1-kHz power is estimated to be

65%.

• Quiescent power draw is approximately 90 watts.

• Typical power draw for the internal fan is 12 watts or less.

• The estimated duty cycles take into account the typical crest factor for

each type of source material.

• Duty cycle of pink noise is 50%.

• Duty cycle of highly compressed rock ‘n’ roll midrange is 40%.

• Duty cycle of rock ‘n’ roll is 30%.

• Duty cycle of background music is 20%.

• Duty cycle of continuous speech is 10%.

• Duty cycle of infrequent, short duration paging is 1%.

Here are the equations used to calculate the data presented in Figure 1:

The following equation converts power draw in watts to current draw in

amperes:

The value used for Power Factor is 0.83. The Power Factor variable is

needed to compensate for the difference in phase between the AC mains

voltage and current. The following equation is used to calculate thermal

dissipation:

The value used for inefﬁ ciency is 0.35 (1.00–0.65). The factor 3.415

converts watts to btu/hr. Thermal dissipation in btu is divided by the

constant 3.968 to get kcal. If you plan to measure output power under

real-world conditions, the following equation may also be helpful:

Figure 1 Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles

POWER-TECH SERIES 1

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Seite 1 - POWER-TECH SERIES

Crown InternationalP.O. Box 1000Elkhart, IN 46515-1000TEL: 219-294-8200FAX: 219-294-8FAXwww.crownaudio.comPT 1.110/01

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