MTR302/A - R302F/A - R302L/A DHHS
MANUALE ISTRUZIONI / INSTRUCTION MANUAL
Modello/Model R302/A
Adjustments
1
R30
2/A
- Adjustment
s
Ralco
srl
ADJUSTMENTS
F
IELD
S
IZE
I
NDICATION
A
DJUSTMENT
EN60601-1-3- par. 29.201.8
Regulations state that collimators must indicate the size of the X-Ray field at the FFD (SID) in
use to within 2% of that FFD (SID).
Shutter Dial Adjustment
• Rotate the two control knobs to completely close both sets of shutters. Use the field light to
check that the shutters are in fact closed.
• Rotate the knobs and make the knob index coincide exactly with the scale reading that
corresponds to size 30x30cm at 1m FFD (SID).
• Measure the x-ray field of the test image.
• If the reading is not correct, adjust the indicator using the screws on the sides of the knobs.
B
UCKY
L
IGHT
L
INE
A
DJUSTMENT
Remove the collimator rear cover to gain access to the point of adjustment. See Chapter -
C
OVER
R
EMOVAL
.
Bucky Position Adjustment
• The line is to fall on a perpendicular bisector line constructed against the antidust plastic
panel toward the control face of the collimator.
• To adjust the position of the line, shift the light support group as required. Note that the
support group and bracket are inside the collimator frame and cannot be seen, but may be
controlled by the two securing screws as shown.
C
ROSSHAIR
A
DJUSTMENT
• Activate the light-field.
• Adjust the light field to a narrow line for each pair of shutters by turning the two knobs alter-
nately.
• Check that the project cross line is exact halfway between the edges of the shutters.
• If adjustment is required, remove the cover from the sides and bottom of the collimator. See
Chapter -
C
OVER
REMOVAL
.
• Loosen the four screws securing the plastic panel and adjust the cross lines to coincide
with the light lines.
• Tighten the screws.
F
RICTION
B
RAKE
A
DJUSTMENT
If the shutter movement is too loose or too tight,
proceed as follows:
• Remove the kobs and the parts of the cover to
access the adjustment point. See chapter -
C
OVER
R
EMOVAL
.
• If a shutter control is too loose and does not hold
position, tighten one of the two screws “
A
” on
on the U bolt that frictions the shaft - as illus-
trated in the
Figure
.