(c) If adjustment was necessary, repeat this procedure until the
exposed areas are within the limits described in paragraph (8)(b).
(9)
Six on one film adjustment .
(a) With the SFD set at the minimum SID, select the radiographic
mode on the generator. Load an unexposed cassette into the SFD and place the film in
the "park" position. Open the shutter blades to their maximum open position.
(b) Select the six on-one format and make six radiographic exposures on
the film. Develop the film and measure the exposed areas. The dimensions of each
exposure should be between 4.625 inches x 3.125 inches and 4.5 inches x 2.875 inches
with no more than 3/16-inch gap or overlap between the images. If they are not, adjust
the "HALF" and "1/3" potentiometers, R15 and R16, to increase or decrease the image
size.
NOTE:
Adjustment of R15 and R16 will affect the image sizes previously obtained
with the two-on-one and three-on-one format selections. Compare the images
obtained with those formats before making this adjustment.
(c) If adjustment was necessary, repeat this procedure until the
exposed areas are within the limits described in (9)(b).
(10) Nine-on-one film adjustment.
(a) With the SFD set at minimum SID, select the radiographic mode on
the generator. Load an unexposed cassette into the SFD and place the film in the
"park" position. Open the shutter blades to their maximum open position.
(b) Select the nine-on-one format and make nine radiographic exposures
on the film. Develop the film and measure the exposed areas. The dimensions of each
exposure should be between 2.75 inches x 2.75 inches and 2.5 inches x 2.5 inches with
no more than 3/16-inch gap or overlap between the images. If they are not, adjust the
"1/9" potentiometer, R17, to increase or decrease the image size.
(c) If adjustment was necessary, repeat this procedure until the
exposed areas are within the limits described in (10)(b) immediately above.
(11) Surface-to-image distance tracking verification. Raise the SFD to its
maximum SID. Repeat the procedures outlined in paragraphs (4) through (10) and
verify the film sizes are within the limits specified for each format. If they are not, it
may be necessary to recalibrate the SID tracking system. Refer to the manufacturer's
service manual for adjustment procedures.
MD0351
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