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:

 


For Optimus RAD & R/F    (CU release 3.x)

·            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


 

Text Box:

 

 

 


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.)