Ralco MTR 221/A - ADJUSTMENTS; FIELD SIZE INDICATION ADJUSTMENT; SHUTTER DIAL ADJUSTMENT; CROSSHAIR ADJUSTMENT

MTR221/A - MTR221/A DHHS
MANUALE ISTRUZIONI / INSTRUCTION MANUAL
Modello/Model R221/A - R221/A DHHS
ADJUSTMENTS
32
R221/A - R221/A DHHS - Adjustments
Ralco srl
ADJUSTMENTS
FIELD SIZE INDICATION ADJUSTMENT
EN60601-1-3- par. 29.201.8
Regulations state that collimators must indicate the size of the X-Ray field at the SID in use to
within 2% of that 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 30x30 cm at 1 m 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 each knob.
CROSSHAIR ADJUSTMENT
• Activate the light field.
• Adjust the light field to a narrow line for each pair of shutters
by turning the two knobs alternately.
• Check that the project cross line is exact halfway between
the edges of the shutters, see Fig. Cross Line.
• 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, see Chapter -
C
OVER REMOVAL.
• Tighten the screws.
FRICTION BRAKE ADJUSTMENT
If the shutter movement is too loose or too tight,
proceed as follows:
• Remove 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 the U bolt that frictions the shaft, see Fig.
Friction Brake.
• If a shutter control is too tight, loosen one of
the two screws A on the U bolt that frictions
the shaft, see Fig. Friction Brake.
WARNING:
THIS IS PROVIDED AS AN AID TO THE END USER. RALCO IS NOT
LIABLE FOR ANY DAMAGES RESULTING FROM THE ALTERING OF PRESET
FACTORY CONFIGURATIONS.
ADJUSTMENTS HAVE BEEN PRESET AT THE FACTORY PRIOR TO SHIPMENT
OF THE COLLIMATOR. SHOULD ANY PROBLEM ARISE REQUIRING THE
NEED TO RECALIBRATE, PLEASE CONTACT RALCO FOR ASSISTANCE BEFORE
PROCEEDING WITH THE ADJUSTMENT.
Fig. Cross Line
Fig. Friction Brake