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12 Pelco Manual C1917M (12/97)
4.1.2 Vertical Phase
Use the V PHASE (vertical phase) button to compensate for vertical phase discrep-
ancies that may occur when two or more cameras are used when the SYNC switch
is set to L.L. Use the tip of a ballpoint pen or the like to press the button. Each time
it is pressed, the line lock position shifts by 60°.
Vertical phase adjustment is not vertical roll adjustment. Vertical phase problems
arise when:
1. Switching rapidly between widely separated cameras with manual or sequen-
tial switchers.
2. Switching between cameras not operating off the same phase of the AC line.
3. Transformers are wired backward (refer to step 8 in Section 4.0, INSTALLA-
TION).
When the vertical phase is out of adjustment, switching between two cameras
may produce what appears to be vertical roll on the monitor. Turning the ver-
tical phase adjustment on the camera, while switching as rapidly as possible
between the two camera views, will synchronize the cameras to the same
phase of the AC line so that there is no vertical roll or flip when switching
between cameras.
4.1.3 Back Focus
The camera is shipped with the back focus adjusted to suit almost all lenses. If
necessary, turn the BACK FOCUS adjusting screw with a screwdriver to adjust the
focal plane. It has a self-locking mechanism, so once adjusted the focus will not
drift.
Fixed Lens Models (Indoor Method)
1. With the camera operating, view an object at least 75 feet away.
2. Set the lens focus ring to infinity.
3. Set the lens iris to its widest usable opening.*
4. Adjust the back focus to bring the object being viewed into the sharpest focus.
Fixed Lens Models (Outdoor Method)
1. With the camera operating, view an object at least 200 feet away.
2. Set the lens focus ring to infinity.
3. Use a neutral density filter in front of the lens to insure that the iris is fully
open.*
4. Adjust the back focus to bring the object being viewed into the sharpest focus
(the filter must be in place).
* The lens aperture must be wide open for all back focus adjustment procedures.
This can be done in subdued lighting or with filters.