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D
DIMMER RACK
Dimmer racks contain individual dimmer modules arranged for convenient
electrical connection. Some racks are designed for permanent installation,
while touring racks are designed for portable use. Dimmer racks typically
contain 6, 12, 24, or 48 dimmer modules typically with 2 dimmers per module.
DMX (DIGITAL MULTI-PLEX)
DMX 512 is a standard dimmer control protocol implemented by U.S.I.T.T. to
provide a means for interfacing dimming and control equipment from different
manufacturers. A single DMX control cable carries dimmer intensity
information for 512 dimmers serially down 2 wires. Many other devices can be
controlled via DMX. Examples include fog machines, strobe lights, and
automated fixtures. These devices, developed since DMX was first
implemented, may interpret the DMX intensity data in different ways. An
automated fixture, for example, may interpret a level of 50 on dimmer 1 as
meaning move mirror in the x direction to the mid-way point.
DRY-ICE FOGGER
A simple fog machine which creates thick, opaque, low-lying or ground fog by
the emersion of frozen CO2 in hot water. This type of fogger is often made
from a large drum containing a heating element and some type of basket in
which dry-ice can be lowered into the water. The resulting fog is often
forced through a hose to the desired location onstage. Dry-ice fog effects
are somewhat short lived as the dry-ice quickly evaporates and the water
cools. Dry-ice is often used to cool the fog produced by other types of fog
machines making it to stay close to the ground. These chiller modules or
attachments are little more than insulated coolers attached to the output
end of a standard fog machine.
DAISY-CHAINING
Connecting items of equipment together by linking from one to the next in a
chain. Used for connecting demux boxes to dimmers etc.
DANCE LIGHTING
Lighting design for Dance is reliant on a great deal of sidelight from BOOMS
at the side of the stage. There are normally at least three lanterns on each
boom, and three heights - SHINS (to light feet and lower legs), MIDS and
HEADS.
DBO
Dead Blackout
DC
Short for DIRECT CURRENT.
DE-RIG
The process of removing lanterns & cabling from flying bars or grid -
returning the venue to it's normal state, or as preparation for the next
production.
DEAD
1) A pre-plotted height for a piece of scenery or lighting bar - "that bar's
on its dead". The positional indicators on the rope (either PVC tape, or
more traditionally cotton tape passed through the strands of the rope) are
called DEADS. Sometimes flying pieces are given a number of extra deads,
that may be color coded, in addition to the "in dead" (lower) and "out dead"
(higher - out of view). In the US, TRIM has the same meaning.
2) Scenery or equipment not needed for current production - "that table's
dead".
3) An electric circuit that has been switched off or has failed - "the
circuit's dead, you can change the lamp now"
DEMUX BOX
Interface unit between the serial digital output of a memory lighting
control desk to the parallel analog signal understood by a non-digital
dimmer.
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