Universal Radiographic System
Service Manual
SM-0524R4
40
b. If the light level in all quadrants is less than 170 lux, it is necessary
to check the following:
G The lamp voltage level when it is ON shall not be lower of
24 VAC. (Measure on the Bulb socket contact).
G Check that the Collimator Lamp, the Mirror and the Mylar
window are not dirty or discolored.
G Check the correct position of the Mirror (Refer to Collimator
Manual).
c. If the light level is still low:
G Replace the Collimator Bulb.
G Replace the Collimator Bulb socket.
4.7.2 COLLIMATOR L IGHT FIELD CONTRAST RATIO
1. Place the Swivel Arm in vertical position. The Tube-Collimator Assembly
has to be perfectly aligned with the Bucky Assembly. Check with a level
correct horizontal position of both assemblies.
2. Position SID at 1 meter (use the SID scale of the Column).
3. Open the Collimator blades to set a Field Size of 25 x 25 cm for SID 1m.
4. T urn ON the Collimator Light and center the Collimator in relation to the
Bucky Table-Top. Horizontal and transversal position of the light axes
projected by the Collimator Lamp must be in line with the axes or Film
Size marked on the Table-Top.
5. Place the Light Meter on the Table-Top with sensor directed toward Light
Source.
6. Place the Light Meter in the center of one quadrant of the light field.
(Refer to Illustration 4-19).
7. Minimize the room lighting. With the Collimator Lamp OFF, measure and
record the ambient light level.
To Next Page
Loading...
