Universal Radiographic System
Service Manual
SM-0524R4
35
c. Measure the radius of the circle (D/2) obtained on the Processed
Film (refer to Illustration 4-14).
Illustration 4 -14
Radius in Processed Film
D/2
SIGNAL
PROCESSED FILM
10. With the measurements obtained on the step-9., calculate the “X” value,
where:
SID
X
h
d/2
D/2
X=
(d/2) x h
(D/2)--(d/2)
11. The SID value to calculate will be: SID = X + h
12. The difference between the indicated SID and the calculated SID may
not exceed 1.8 % (rejection limit) of indicated SID. Therefore the
deviation of SID calculated should be not higher than 18 mm for SID at
1 meter.
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