Specifications

Status: Released
Version:2.2
Document: ITS-AVS Audio Visual Standards
V2.2Issued.docx
Author: Dean McFadden
Save Date: 25/08/2014
Page 27 of 63
a) Distance to furthest viewer shall be no more that 5.3 times the height of the displayed image
b) If the 5.3 Ratio cannot be maintained due to physical constraints the ratio can be extended to a
maximum of 6 with prior written approval from the Principal.
c) No viewer’s sightline to the top edge of the screen shall be more than 35º from horizontal. The
center of the image should not be more than15
o
from the horizontal.
d) No viewer’s sightline to the opposite vertical edge of the screen (furthest screen when multiple
displays are specified) shall be more than 45º from straight ahead
e) Distance to the closest viewer shall be no less than twice the height of the displayed image
In all cases the bottom of the projected image should be at least 1200mm above finished floor level.
Where an interactive white board is installed the top of the whiteboard is to be a maximum of 2100mm above
finished floor level. Note: depending on board size the bottom edge of the image may be a minimum of
850mm above finished floor level.
2.13.4 Image geometry
The projected image shall be rectangular with parallel edges and 90º corners. Optical image correction via lens
shift may be used to correct image positioning. Digital correction of ‘keystone’ or other geometric aberrations
must not be employed without prior approval from Principle.
2.13.5 Projector mounting
Projectors shall be installed on a University approved secure ceiling mount bracket adequately fixed to the
buildings structure. The bracket must include an adjustable dropper, configured to align with the top of the
projection screen. Electronic image adjustment shall not be used unless specifically nominated by the Principal.
Installation of the projector bracket must be coordinated with other services to ensure that other ceiling
mounted utilities such as sprinkler systems, mechanical ducts and light fittings do not interfere with the size and
quality of the projected image.
The AV Integrator is required to verify that the mounting surface will support the weight of the projector,
mounting bracket and associated loads imposed during maintenance (technical supporting themselves on the
mounting bracket as they service the projector or climb the ladder.
Projectors mounts must include an equipment cage to securely house twisted pair receivers and other
associated components and power supplies.
Projectors mounts must be include provision to fit an RMIT approved locking mechanism to prevent theft and
damage.
2.13.6 Projector Image Shake/Vibration
Protection image shake is a very real problem in both new building projects and refurbishment projects. This
issue is not always evident prior to the installation of the system. RMIT look toward its integration partners to
actively identify possible vibration problems that may occur throughout an install. If the image shows signs of
vibrations the principle must be contacted immediately.
The possibility any form of image degradation should be investigated during the room scoping at the time of
tender.
Installation methods used by the Integrators shall not cause, or exaggerate vibrations in the image.