Checking The Compression Unit - Siemens MAMMOMAT Novation DR Parts Replacement

Compression Unit
•
Repeat the measurement once/twice if the scales show a value exceeding the pre-
scribed tolerance +/- 0.3 kp of the nominal 20 kp. To do this, decompress by about 50 N
via the other foot-switch and then compress again.
•
If the (average) force shown on the scales doesn't fall into the given range, the hexa-
decimal value for force = 200 N stored in the data field has to be adjusted.
(This is only an approximation, meant as an example; please observe the actual
behavior: decreasing the default value "02D8" by four units (to: 02D4) will result in a
force decrease of approximately 2 N. A corresponding increase (to: 02DC) will result in
a force increase of approximately 2 N. )
•
Adjust the hexadecimal value and save it by pressing F2.
•
When the adjusted value is saved (under calibration ), cross-check the force as de-
scribed above. Adjust the hexadecimal value, if necessary. Perform another
cross-check.
•
Save the final value by pressing F2. This should exit the menu (otherwise press ESC).
Optimized compression
•
Select Optimized Compression in the main menu, under Configuration > Compres-
sion.
•
Re-enter the value "5137" in both OPCOMP data fields, i.e. for OPCOMP 18 x 24 and
for OPCOMP 24 x 30.
•
Save the entered value by pressing F2.
•
Exit the menu by pressing ESC.

Checking the compression unit

Maximal compression – lowest position of the paddle
•
Attach the same compression plate used for the work step: "calibrating the thickness
top mm" to the compression unit.
•
Activate the foot-switch to move the compression plate cautiously downward.
•
Check whether the bottom of the paddle has reached the surface of the carbon cover.
Lower endpoint
•
First detach and remove the compression plate from the unit.
•
Attempt further downward motion via the foot-switch. Keep the switch pressed until the
sled reaches its lowest limit position (mechanical stop).
•
Read and record the compression thickness data (in mm) for the lower endpoint, as
shown on the stand display.
Upper endpoint
•
Move the compression plate upward to its upper endpoint.
•
Reattach the compression plate and measure the distance from the top of the carbon-fi-
ber cover of the object table to the bottom of the paddle of the compression plate, e.g.
by means of a tape measure. (As for the calibration of "thickness top mm".)
•
Read and record the corresponding data shown on the stand display. Compare it to the
data just measured.
•
Remove the compression paddle.
Siemens AG
Medical Solutions
SPB7-250.841.01.04.02
05.05
MAMMOMAT Novation DR
Page 35 of 64
CS SD 24
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