Universal Radiographic System
Service Manual
SM-0524R4
39
5. Place the Light Meter on the Table-Top with sensor directed toward the
Light Source.
6. Place the Light Meter in the center of one quadrant of the light field (refer
to Illustration 4 -18).
Illustration 4 -18
Light Meter on Table-Top
LIGHT FIELD
1st QUADRANT
3rd QUADRANT
LIGHT SENSOR ON THE 2nd QUADRANT
LIGHT METER
4th QUADRANT
7. With Collimator Lamp OFF, measure and keep record of the ambient light
level.
8. Do not move the Light Meter. With the Collimator Lamp ON, measure and
keep record of light level of that quadrant.
9. Determine the light intensity of that quadrant by subtracting the ambient
light level from the corresponding light level.
10. Repeat measurements at the approximate center of remaining three
quadrants of light field.
11. With the measurements obtained on the step-10., the results of Light
Field Intensity in all quadrants should be higher of 170 lux
(16 foot-candles) and among all the quadrants the intensity light field
shall be not differ more than 10%.
12. The average illumination at a distance of 1 meter from the focal spot shall
not be less than 160 lux (15 foot-candles). Rejection limit is 170 lux
(16 foot-candles).
13. If the deviation of Light Field Intensity is out acceptance limits, it is
necessary to take into account the following:
a. If the difference of Light Field Intensity among all quadrants is
higher than 10%, we need to readjust the Collimator Lamp socket.
Refer to Collimator Manual.
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