Repair manual

CALIBRATION & ADJUSTMENTS
5-24
before starting to rise once again. The lowest value before the first rise is called
the Null Point (Figure 5-13).
3. When you have found the Null Point, turn the focus wheel slightly to lose it, then
turn the wheel to once again find the Null point. Do this several times to make sure
you have properly established the Null Point.
4. With the meter needle on the Null Point, set the dial on the Dial Gauge to zero.
5. Again, turn the focus wheel to lose the Null Point, and then re-adjust the focus wheel
to re-establish it. The dial should still read zero +/- .002. If it doesn’t, start this
procedure from the beginning.
6. Remove the 108 Adapter Collimtion Master and install the 108 Camera Back, that
needs to be checked, in its place.
7. Carefully turn the focus wheel on the Dial Gauge Assembly while observing the Null
Meter. Stop when the Null Point is reached.
8. If the reading on the Dial Gauge Assembly is within +/- .015 from zero, the Camera
Back Assembly is in collimation.
Procedure:
1. Turn on the Light Source and the Null Meter.
Note
Set the Light Source to the lowest possible intensity
in order to preserve the lamps.
2. While observing the null meter, turn the focus wheel on the Dial Gauge Assembly.
There is a point where the meter starts to rise and then drops back to a lower value
3. Connect the fiber optics to the Light Source #1-150 and the Null Meter #C-13000.
Secure the fibers using the setscrews on the connectors. The fiber optics are
interchangeable; either can terminate at the Light Source or Meter.
1. Install the Dial Gauge Assembly on the Camera Back Collimator #12993. Make
sure the Gauge Assembly is set at the 108 position.
2. Install the 108 Adaper Collimation Master #12994 on the Camera Back Collimator.
Make sure the master is firmly attached to the collimator.