AUDIO VISUAL SYSTEMS 27 4116-
© BNA Consulting, Inc.
recognized industry practices, to insure that the system fulfill requirements.
B. Use extreme care in handling, fishing and pulling of electronic cable to avoid damage to
cable. Avoid excessive number of bends. Contractor is responsible for replacing cable
that has been mishandled or suffers from poor performance due to installation. Cables
shall not be spliced, specified junction boxes, conduit, cabling, pull strings, speaker
enclosures and equipment cabinets are properly installed and labeled with labeling
requirements previously mentioned.
C. Contractor shall ensure that no solid or decorative structure shall impede audio broadcast
from speakers and that no structure greater than 3/4 inch is permanently placed in front
of the speakers.
D. Firmly secure all equipment in place that is not intended for portability.
E. Mount permanently and/or provide mechanical index insuring precise alignment of the
projected image of optical projectors.
F. Provide adequate structural support for components. Provide fastenings and supports
with a safety load factor of at least five.
3.2 FIELD QUALITY CONTROL:
A. TESTING:
1. Upon completion of installation of each system and after electrical circuitry has
been energized, demonstrate capability and compliance with requirements.
Where possible, correct malfunctioning units on site, then retest to demonstrate
compliance; otherwise, remove and replace with new units, and proceed with
testing.
2. Before inspection by owner and engineer, and after completion of the installation,
conduct system tests and make necessary corrections for proper system
operation including, but not limited:
a. Test for compliance with the functional requirements and performance
standards.
b. Adjust, balance and align equipment for optimum quality and to meet the
manufacturer’s published specifications.
c. Prepare and maintain documentation of performance tests, including
numerical values of established equipment settings, for reference during
the system acceptance tests. Submit final results to owner and Engineer.
d. Prepare and maintain documentation of performance tests, including
numerical values of established equipment settings, for reference during
the System Acceptance Tests. Submit final results to owner and
Engineer.
e. Test signal: Establish a nominal test signal level to be input to the
speech and program sound systems. Record preliminary signal level.
f. Loudspeaker-Line Impedance: Measure at 250 Hz, 1 kHz, and 4 kHz the
impedance and resistance of each loudspeaker line leaving the sound
equipment rack with the line disconnected from its normal driving source.
g. Measure the hum and noise levels of the overall system for each
microphone input channel and line-level input channel.
h. Adjust gain controls for optimum signal-to-noise with 0 dBu at a line-level
input.
i. Provide uniformity coverage of ±2 dBa, measure octave band of pink
noise test signal, at 1, 2, and 4 kHz, played through loudspeaker system.
j. Perform polarity checks of loudspeaker lines by means of a polarity
tester or use DC source at one end of each line and a voltmeter at the
other end. Loudspeaker lines shall be identically polarized with respect
to color coding.
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