CAMBRIDGE QT Guide d'installation télécharger pdf (Page 7)

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Setting the masking volumes can be approached in one of two ways:

BEST: If a sound level meter is available, it is recommended that

the control module’s masking volumes be adjusted up or down to

achieve the following readings on the meter:

Private Ofce Zones

38-42 dBA, averaged spatially within the ofce

Open Area Zones

45-48 dBA, measured 3 ft. (0.9 m) above oor level

OTHERWISE: If a sound level meter is not available, the above levels

are likely to be achieved in most environments by setting the control

module’s masking volumes as follows:

Private Ofce Zones

05-09, for all ceiling heights

Open Area Zones

13-16, for 8 ft. (2.4 m) ceilings

15-18, for 10 ft. (3 m) ceilings

17-20, for 12 ft. (3.7 m) ceilings

Masking volumes must be set sufciently high to improve speech

privacy and reduce distraction but not so high that the masking

sound becomes objectionable. Settings within the above ranges

should accommodate both objectives. As a general rule, use the high

end of the range. Base nal settings on site conditions and customer

preferences. If people object to the sound level, set masking volumes

toward the bottom of the range or refer to the ‘Ramping’ section of

this guide, found on page 24 for more information on introducing

masking into the space gradually. Remember that the effectiveness

of the system relies on sufcient masking sound level and that initial

objections are often overcome as people become accustomed to the

sound.

Different day and a night volumes may be set. The control module

ramps linearly between these two settings beginning at the time

specied and over the period of time specied. As the control

module ramps between settings, the current volume is displayed

under “Current.”

NOTE: This document uses the QtPro software version 6.0.0 for

feature conguration.

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CAMBRIDGE QT Guide d'installation Page 7