Formula Sound SENTRY MK2 사용자 설명서 - 페이지 10

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Formula Sound SENTRY MK2에 대해서도 마찬가지입니다: 사용자 설명서 (11 페이지)

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adjustments when the noise level is displayed on the bar graph meter as you will be able to see the

changes displayed on the meter.

The adjustment pre-sets have a slipping clutch at the end of travel to prevent damage. But this can

cause confusion if the pre-set is at the end of travel as it then appears to do nothing (this is not

usually a problem once you know about it).

The actual sound pressure level (SPL) at which the unit operates can only be determined by

measuring the noise level using a calibrated sound pressure level meter and adjusting the unit

accordingly. Play music at the maximum required level (monitor with SPL meter) and adjust ADJ1 so

the "LIMIT" LED's (right hand of display) are going on and off. A small increase in the music level will

now trip the system after about 20 seconds, level 1 is now set. Repeat for level 2 if the second level

is also to be used.

Alternatively the unit may be adjusted using trial and error but this should be used only as a

temporary measure or last resort. Measuring the sound level and setting to a limit agreed with the

local area official is the only recommended method.

An internal measuring microphone is fitted which will be suitable for most applications but should the

need arise an external microphone can be connected. The external microphone may be a moving

coil type, capacitor or electret. Microphone phantom power is provided and may be selected as

required. Select a microphone with the required frequency response and polar response. (Please

telephone our technical department if help is required).

NOTES:- If the unit is to be used in an entertainment venue to control a band or disco use a meter

with either a linear scale or 'C' weighting response.

The frequency response of the measuring circuit of the Sentry may be selected to be, Linear (Flat

response) 'C' (conventional C scale), Bass (LP filter @ 300Hz 12dB per octave slope) or A weighting.

see Drg No 879.

'A' weighting is a frequency response curve that resembles the human ear response. It is much more

sensitive in the mid 500Hz - 5 kHz region. It is not recommended for entertainment venues as it is

less sensitive to the bass regions and bass regions travel most and annoy neighbours more. Most

industrial applications will need A weighting.

SECURITY LABELS ARE PROVIDED. THESE SHOULD BE FITTED TO COVER

THE SCREW HEADS HOLDING THE REMOVABLE COVER IN PLACE AND WILL

REVEAL ANY UNAUTHORISED ATTEMPT TO CHANGE THE THRESHOLDS

ALWAYS FIT SECURITY LABELS AFTER ADJUSTMENTS HAVE BEEN MADE.

EXTRA LABELS ARE AVAILABLE FROM FORMULA SOUND IF REQUIRED.

Remember that the acoustic characteristics of a venue will change depending on the number of

people in it. Our experience has shown that it is always advisable to take readings when the venue is

in use. It would be a wise precaution to allow in your costings for a site visit during opening hours to

take measurements and make final adjustments.