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City of Santa Ana Public Library Renovation <br />Smith, Fause & McDonald Inc.Group 4 Architecture Research + Planning, Inc. <br />Conform SetASI #026 – August 72, 20254 Group 4 Project No. 22575-01 <br />SECTION 27 4116-68 INTEGRATED AUDIOVISUAL SYSTEMS AND EQUIPMENT <br />6.Routing and dressing of wire and cable. <br />7.All wiring, including polarity and continuity, including conformance with wire <br />designations on running sheets, field and shop drawings. <br />8.Mechanical integrity of all support provisions. <br />C.Rig temporary power and grounding. Comply with all applicable Codes, regulations and <br />ordinances. <br />D.Determine the proper sequence of energizing systems to minimize the risk of damage. <br />Energize. Burn in for at least 168 hours. <br />E.Sound Systems: <br />1.Gain control settings: Establish tentative normal settings for all gain controls. Set all <br />equalizers flat. Set all automatic gain control devices to bypass. Terminate power <br />amplifier outputs with power load resistors with resistance value within 10% the <br />nominal output impedance of the respective amplifier. Adjust all gain controls on <br />equipment for optimum signal-to-noise ratio and signal balance and, unless they are <br />sub-panel mounted, cap them to prevent tampering. Unless specified or directed <br />otherwise, adjust gains such that in a given system the "front end" operates at unity <br />gain and maintains 10 dB of clip margin referenced to the first onset of clipping of the <br />associated power amplifier(s). Measure and document system gains at 1 kHz. <br />Settings may require further adjustment by the Contractor, a result of testing by the <br />City's Representative. <br />2.Freedom from parasitic oscillation and radio frequency pickup: Maintain previous <br />setup. Set up for each mode of operation specified in the functional requirements; <br />verify that all systems are free from spurious oscillation and radio-frequency pickup <br />using broadband oscilloscope. Correct any such defects. <br />3.Hum and noise level/signal to noise level/signal to crosstalk level: Maintain previous <br />setup. Terminate microphone and line-level inputs with shielded resistors of 150 and <br />600 ohms, respectively. Set available variable gain controls such that full power <br />amplifier output would be achieved with -40 dBm input level at a microphone input <br />and +12 dBm at a line-level input. Measure and document the specified parameters <br />of the system overall for each microphone input channel and line-level input channel. <br />Compare with nominal signal level. <br />4.Total Harmonic Distortion: Maintain previous setup. Measure at reference operating <br />level at least at 63 Hz, 125 Hz, 1 kHz, 10 kHz. <br />F.Baseband Video Systems: <br />1.Picture Monitors: <br />a.Apply crosshatch. Verify linearity. <br />b.Apply red field. Adjust purity. <br />c.Apply SMPTE bars and PLUGE. Adjust to standards. <br />2.Video Path Test: Use manufacturer's procedures. Use full field or line signals. <br />G.Data/Graphics Systems: <br />1.Projector: <br />a.Apply crosshatch. Converge at design distance. Verify linearity. <br />b.Apply red, green and blue field. Adjust purity. <br />2.Wideband Component Analog Video Path Test: Use manufacturer's procedures. <br />H.Control System: <br />1.Demonstrate complete operation. <br />3.10 PROJECTION SCREEN INSTALLATION