Repair manual

CALIBRATION & ADJUSTMENTS
5-21
Before performing the following step, make sure the
plunger on the dial gauge is no more than 1/4 inch
from the end of the tube as shown in the inset of
Figure 5-12.
2. While observing the Null Meter, turn the focus wheel on the Dial Gauge Assembly.
There is a point where the needle starts to rise and then drops back to the lower value
before starting to rise again. The lowest value after the first rise is called the Null
Point (Figure 5-13).
Figure 5-13. Null Point
3. When you have found the Null Point, turn the focus wheel slightly to lose it. Then
turn the wheel to return the the Null point. Do this several times to be sure it’s
accurate.
4. With the meter needle on the Null Point, set the dial on the dial gauge assembly to
zero.
5. Again, turn the focus wheel to loose the Null Point and then adjust the wheel to
re-establish it. The dial gauge should still read zero (+ .002). If it doesn’t, repeat
this procedure.
6. Remove the 35mm Collimation Master #12995 from the Collimation Adapter.