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 Figure
lamp's field.
Step 1: Turn on the fixture and aim it at a flat surface. Adjust the barrel to create a hard edge.
Step 2: Unlock and loosen the outer knob by turning it counterclockwise.
Step 3: Gently move the outer knob from side to side and up and down until the lamp is centered
within the reflector.
Step 4: Once the lamp is centered, turn the outer knob clockwise to lock it in place.
Step 5: Finally, turn the inner knob either clockwise or counterclockwise to achieve an optimum
flat field. See
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: Loosen the beam focus knob(s) on the underside of the barrel as shown in
Step 2: Slide the lens(es) forward or backward to achieve the desired beam edge.
Step 3: Once the fixture is focused, tighten the beam focus knob(s).
Inner Knob -
peak/flat field
adjustment
Figure 4
4. The outer knob centers the lamp within the reflector. The inner knob adjusts the
Figure 5.
Beam focus knobs
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