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Key terms and concepts
Audiovisual technician
A person with the knowledge, skill and
expertise to set up and operate audiovisual equipment.
Cables
All electrical components
in audiovisual (AV) system are interconnected with cables - wiring which
has been temporarily rigged to carry electrical current.
Common problems and solutions
These would include the consideration
of workplace requirements and decisions to ensure correct cabling, correct
connectors, correct data transfer protocols, key stoning, focusing, operating
distances and screen sizes.
Electrical measurements
This relates to the use of equipment with
corresponding or appropriate voltages, current, resistance and other electrical
features. (In Australia we use 240 volt AC power and most domestic fuses
are 10 to 15 amps)
Features, purpose and basic operating
procedures for vision system equipment
This relates to the appropriate selection
of vision system equipment as needed for each situation. For example, it
would not be appropriate to use a film projector and a two metre square screen
for a presentation to 300 people using a computer as the source. Also, operating
a projector at a distance from the unit would require a remote control.
Legal issues
These may include display of material
that does not breach copyright or break privacy laws, display in appropriate
venues, and use of equipment as intended by the manufacturer or supervisor.
Power
Power types include three phase industrial
power, standard 240volt domestic power or DC battery power, and should be
appropriate to the venue or equipment.
Production plans
This relates to the understanding and
interpreting of technical notes, vision system plans, stage plans, rigging,
audio and lighting plots, production schedules, ground plans etc.
Rigging and positioning points
Rigging (hanging) or positioning of projectors,
screens, source devices and cables must be appropriate to the audience size,
position, angle of head lift and rotation, and must take all safety issues
into account.
Safe work practices
There are a number of safe work practices
which should be considered when using vision systems. These include following
all OHS procedures for the use of appropriate personal protection equipment
and taking care when lifting and working at height.
Safety issues
These may include electrical hazards,
heights, weight, lifting, cabling and trip hazards, extreme light exposure
hazards and operating hazards such as excessive head rotation or lift angle.
Set-up sequences/procedures
It is essential to follow schematics,
signal flow diagrams and production plans to ensure correct set up and operating
sequences for each particular item of equipment.
System checks
This entails testing all of the equipment
pre and post set-up. Each device should be tested both separately and as
part of a system once interconnected.
Vision system plans/instructions
This refers to things such as schematics,
signal flow diagrams and production plans which enable the vision system
to be used for the optimal effect.
Vision systems
Often
called ‘A/V (audio-visual)
systems’
in the past, now more often known as ‘vision systems’, this term
refers to groups of devices which are interconnected to provide visuals, including
data, still photos, graphs or other still images, animations or video. From
the simplest VCR and TV monitor combination to a camera, computer, DVD, vision
mixer, data projector, video projector, monitor and screen combination, each
group of interconnected devices is called a vision system.
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