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Maintenance—C-30B Camera
MAGNIFICATION ADJUSTMENTS
To verify that the camera magnification setting is
correct, perform Steps 1 through 4 of the following pro-
cedure. If there is a need fo r resetting the magnification,
perform the remaining steps of the procedure.
1. With the camera mounted to the instrument, obtain a
sharply-focused display of known amplitude on the
crt.
2. Set the camera magnification to 1.
3. If a Pack-Film or a Roll-Film back is being used,
install a focusing plate and focus the crt display. If a
Graflok back is being used, press the viewing hood
release button and focus the crt display on the
frosted plate. Secure the focus setting by tightening
the FOCUS LOCK knob.
4. Measure the image size on the focusing plate (or
Graflok back) and compare it to the trace size on the
crt display. The magnification ratio should be 1:1.
5. If the ratio is not 1:1, loosen the magnification sleeve
lock collar set screw by using a 0.050-inch hexagonal
wrench. Slowly slide the camera either toward the
instrument to increase the image size or away from
the
instrument
to
decrease
image
size (see
Figure 3-1).
6. Tighten the magnification sleeve lock collar set screw.
Release the FOCUS LOCK knob and focus the
camera.
7. Again determine the ratio between the crt trace and
the image on the focusing plate (or Graflok back). It
should be 1:1.
8. If a 1:1 ratio cannot be attained between the crt trace
and the image on the focusing plate (or Graflok
back), repeat steps 4 through 7 until the image size is
correct.
M A G N IF IC A T IO N
SLEEVE LOCK
COLLAR SET
SCREW
2 8 2 5 -1 6
SET THE CAM ERA
OBJECT-TO-IMAGE
TO 1 IN W INDOW
Figure 3-1. Sleeve lock collar location.
3-2
Summary of Contents for C-30B
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