Adjustments; Centering Lamp And Adjusting The Field; Focusing The Beam - ETC source four jr User Manual

Adj ustments
C e n t e r i n g l a m p a n d a d j u s t i n g t h e f i e l d
Rear lamp
housing
Outer Knob - lamp
center adjustment
The two concentric knobs located on the lamp housing allow you to align the lamp and adjust its
field. See
lamp's field.
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
F o c u s i n g t h e b e a m
On a fixed field angle Source Four jr., with a 26°, 36° or 50° lens, adjust the lens single beam focus
knob to focus the edge of the beam. On a Source Four jr Zoom, adjust the position of both lens
beam focus knobs to set the beam's spread and to focus the edge of the beam. The Zoom lens
provide a range from 25° to 50°.
Step 1:
Step 2:
Step 3:
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Figure 4. The outer knob centers the lamp within the reflector. The inner knob adjusts the
Turn on the fixture and aim it at a flat surface. Adjust the barrel to create a hard edge.
Unlock and loosen the outer knob by turning it counterclockwise.
Gently move the outer knob from side to side and up and down until the lamp is centered
within the reflector.
Once the lamp is centered, turn the outer knob clockwise to lock it in place.
Finally, turn the inner knob either clockwise or counterclockwise to achieve an optimum
flat field. See Figure 5.
Beam focus knobs
Loosen the beam focus knob(s) on the underside of the barrel as shown in
Slide the lens(es) forward or backward to achieve the desired beam edge.
Once the fixture is focused, tighten the beam focus knob(s).
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Inner Knob -
peak/flat field
adjustment
Figure 4
Flat field-best adjustment
Hot spot - lamp pulled out
too far
Field with hole - lamp
pushed in too far
Figure 5
Figure 6
Figure 6.
5