User manual

Bijou
31
tionship between a Fader (automatic or manual
control) and how the dimmer turns ON. The first
Profile on the screen is the Bijou default profile.
Profile 1 is a LINEAR PROFILE that has the out-
put of the dimmer equal to the percentage of
travel of the Fader. If you raise a Channel Fader
to a level of 65, the dimmer is at 65% of its total
output.
To navigate to the Profile Screen (Figure 36),
push the [Patch/Profile] key twice. The green/
yellow column on the right of the screen lists Pro-
files 1-25. The row across the top shows the fade
position as a percentage.
On the Profile Screen, Profile 1 is entered auto-
matically as the system default. The need to mod-
ify or select a profile other than Profile number 1,
is limited to special case applications.
Profiles 2, 3, and 4 are listed as Preheat. The
selection of a Preheat Profile for a dimmer sends
a small amount of current out of the dimmer, even
when the dimmer control Fader and Grandmaster
is at 0. Preheat Profiles are often used for out-
door dramas where condensation in a fixture
could cause lamp failure or cracked lenses if sud-
denly turned from OFF (cold) to ON.
A cold filament requires a substantial current to
glow. By preheating the filament, the lamp fades
rather than POP ON. The three preheat choices
allow you to select the right amount of current for
the size of the filament being worked with.
Profile Number 6 is SQUARE LAW which, in the-
ory, makes the visible output of a lamp equal to
the percent of travel of the Fader controlling the
dimmer output. In theory, if the Fader is faded up
to 35m, the lamp appears to be at 35% of its total
light output. This is dependent on the optics of the
fixture, the size of the lamp filament, the input
power voltages to the dimmers, and the length
and size of the wiring from the dimmer to the fix-
ture/lamp.
Profile Number 7 is ballast. It is used for non-
incandescent fixtures such as neon, cold cath-
Figure 37-Profile Screen
Figure 36-Profile Screen