Note: This revised section to be filed into the Service Manual to replace the section ‘Tube Conditioning‘.
1x.1
Tube adjustment
1x.1 Conditioning of the tube(s)
U Warning! Radiation is released during the procedure!
This procedure must be performed for each new installation, tube replacement, but also if a symptom points to any kind of tube arcing.
Precondiontions
/ Programmings:
·
Perform the following programmings
temporarily for each tube connected to one of the assigned RGDV = Free
cassette:
XRGSCOPE
PROGRAMàREGISTRATION DEVICESàRGDV#àDATA SET A:
Temporarily: Original:Tube1,2,3
Enable handswitch.... YES Verify
the
Synchmaster present NO custimezed
Exposure switch type Double Step entries
Exposure series / Tomo... YES in
2Z-2.x
Mounted radiographical.. NONE
· Reset the generator
· Select appropriate programmed RGDV ‘Free cassette‘ for each tube to be break in.
For
Optimus C ( Duo Diagnost)
Note: No change of programming is required.
· Select Registration Device ‚Free cassette‘ for this tube.
Procedure:
· Select large focus
Note: The generator must be in the READY state.
· Run reconditioning procedure for an adapted tube, refer to the table ‘Exposure data set for conditioning’, left column ‘Tube adapted’.
or
· Run conditioning procedure for a new or non-adapted tube, refer to the table ‘Exposure data set for conditioning’ , right column ‘Tube not adapted’.
·
It is recommended to monitor the high
tension during conditioning. Connect
the scope:
Channel1: kV AV HT at EZ 130 X3
(1V/div), scale: 20kV/V
Trigger external: CTRL_X_C/ at backpanel EZ X74, negative slope
Time base: 2ms/div.
·
In case of problems like tube arching
see flowchart ‘Exposure sequence’ as an example, apply for applicable kV range
only:
i.e. 109 kV is the max kV value for normal application, perform just up to next
higher kV step = 117kV.
Notes (refer to flow chart ‘Exposure sequence’): If the tube arcs at a certain kV value, conduct another 3 exposures with same parameters and 10 s pause between subsequent exposures. In case of success (no arcing anymore) continue with next kV step of the table “Exposure data set...”.
If the last exposure still arcs go one kV step back and follow normal procedure. If this routine has been performed three times without improvement; à replace the tube.
Exposure
parameter for conditioning
|
|||||
Tube adapted |
|
Tube not adapted |
|||
kV |
mA |
ms |
# exposures |
kV |
mAs |
80 |
10 |
50 |
< 1 > |
80 |
0.5 |
80 |
10 |
500 |
< 1 > |
80 |
5 |
80 |
200 |
250 |
< 1 > |
80 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
80 |
max mA |
100 |
< 1 > |
80 |
100 |
1 minute pause |
|
1 minute pause |
|||
90 |
10 |
50 |
< 1 > |
90 |
0.5 |
90 |
10 |
500 |
< 1 > |
90 |
5 |
90 |
200 |
250 |
< 1 > |
90 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
90 |
max mA |
100 |
< 1 > |
90 |
100 |
1 minute pause |
|
1 minute pause |
|||
100 |
10 |
50 |
< 1 > |
100 |
0.5 |
100 |
10 |
500 |
< 1 > |
100 |
5 |
100 |
200 |
250 |
< 1 > |
100 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
100 |
max mA |
100 |
< 1 > |
100 |
100 |
1 minute pause |
|
1 minute pause |
|||
110 |
10 |
50 |
< 1 > |
110 |
0.5 |
110 |
10 |
500 |
< 1 > |
110 |
5 |
110 |
200 |
250 |
< 1 > |
110 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
110 |
max mA |
100 |
< 1 > |
110 |
100 |
1 minute pause |
|
1 minute pause |
|||
120 |
10 |
50 |
< 1 > |
120 |
0.5 |
120 |
10 |
500 |
< 1 > |
120 |
5 |
120 |
200 |
250 |
< 1 > |
120 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
120 |
max mA |
100 |
< 1 > |
120 |
100 |
1 minute pause |
|
1 minute pause |
|||
130 |
10 |
50 |
< 1 > |
130 |
0.5 |
130 |
10 |
500 |
< 1 > |
130 |
5 |
130 |
200 |
250 |
< 1 > |
130 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
130 |
max mA |
100 |
< 1 > |
130 |
100 |
1 minute pause |
|
1 minute pause |
|||
140* |
10 |
50 |
< 1 > |
140* |
0.5 |
140* |
10 |
500 |
< 1 > |
140* |
5 |
140* |
200 |
250 |
< 1 > |
140* |
50 |
10 seconds pause |
|
10 seconds pause |
|||
140* |
max mA |
100 |
< 1 > |
140* |
100 |
1 minute pause |
|
1 minute pause |
|||
145* |
10 |
50 |
< 1 > |
145 |
0.5 |
145* |
10 |
500 |
< 1 > |
145 |
5 |
145* |
200 |
250 |
< 1 > |
145 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
145* |
max mA |
100 |
< 1 > |
145 |
100 |
1 minute pause |
|
1 minute pause |
|||
148* |
10 |
50 |
< 1 > |
148 |
0.5 |
148* |
10 |
500 |
< 1 > |
148 |
5 |
148* |
200 |
250 |
< 1 > |
148 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
148* |
max mA |
100 |
< 1 > |
148 |
100 |
1 minute pause |
|
1 minute pause |
|||
150* |
10 |
50 |
< 1 > |
150 |
0.5 |
150* |
10 |
500 |
< 1 > |
150 |
5 |
150* |
200 |
250 |
< 1 > |
150 |
50 |
10 seconds pause |
|
10 seconds pause |
|||
150* |
max mA |
100 |
< 1 > |
150 |
100 |
Note: If a tube arcs at a kV value which is not required for application the max kV (e.g.117kV) program this new limit value via
XRGSCOPE
Program à Tubes à Tube Limits à Max. Tube Voltage Limit [kV]: [117].
Since the limit value got reduced by this reason, a following re-adaptation procedure will set the field ‚Adapted To [kV]‘ to this value as well.
· Set RGDV programming to original status if no adaptation procedure has to be executed.
· Reset the generator
(Note: If adjustment ‘factor for duty cycle’ was interrupted by tube arcing, return to that procedure now.)