Siemens MAMMOMAT Novation DR Parts Replacement page 34

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Attach a compression plate to the compression unit. Do not use the compression plate
with the "flex" paddle for this work step. Use the compression plate with a regular paddle
(recommended size: 18 x 24cm). This same compression plate has to be used for the
final check of the compression after all the calibration steps have been performed. The
object table (e.g. 18 x 24 cm) has to be mounted on the base plate.
•
Position the cursor in the data field for thickness top mm.
•
Move the vertical sled of the compression unit to its highest position by means of the
foot switch. Use the hand wheel when the drive stops to ensure that the sled reaches its
upper mechanical limit position.
•
Measure the distance from the top of the carbon-fiber cover of the object table to the
bottom of the paddle of the compression plate, e.g. by means of a tape measure. Enter
the data measured in millimeters (mm) in the corresponding data field.
Calibrating force = 0 kp
NOTE
•
Position the cursor in the data field of the force = 0 kp row with the help of the "TAB key"
on the keyboard. The actual position of the two-digit cursor in the four-digit data field is
of no importance.
•
Activate the foot-switch to move the compression plate downward approximately 5 cm.
•
Press F3 (calibrate), then press F4 (update).
Calibrating force = 20 kp
•
Move the compression plate to its highest position.
•
The compression plate used in previous step remains attached to the compression unit.
•
Position the cursor in the data field of the force = 20 kp row with the help of the "TAB
key" on the keyboard. The data field should contain the default hexadecimal value
"02D8". First perform a cross-check and then use the keyboards to make any neces-
sary corrections.
•
Place a suitable dynamometer, e.g. a very good quality scale with a digital display (hav-
ing a measuring tolerance possibly lower than 100 pond/gram), onto the object table.
Protect both the carbon-fiber cover of the object table and the plexi of the compression
paddle with a cloth or towel against damage from the used scale.
•
Move the drive downward from the compression plate via the foot switch. Never use the
hand wheel during this measurement! The paddle will move and reach the scales. Hold
the foot-switch steady. The paddle will compress the scales. Release the foot-switch
only when the compression force, i.e. its value displayed on the scales, no longer
changes. Wait approximately 10 to 15 seconds in order to allow the setup to stabilize
before reading the measured value.
MAMMOMAT Novation DR
The sled is still in its highest position. The regular compression
plate 18 x 24 cm used for the previous calibration step is still at-
tached to the compression unit. These are the correct prerequi-
sites for the following calibration step. In order to eliminate the
tolerances of the gear within the compression unit, it is important
to move the sled down approximately 5 cm by means of the foot-
switch. Do not use the hand wheel in this step! Proceed as follows:
SPB7-250.841.01.04.02
05.05
Compression Unit
Page 34 of 64
CS SD 24
Siemens AG
Medical Solutions