FU - mA adaptation results

 

Adaptation Results

 

 

Select Adaptation Table for Reading

 

Only possible with an adapted filament

focus:

 

type in filament number, see table ‘focus number FU-mA’ 

U  [kV]:

 

type in a kV value between 40...150kV (or whatever the limit is)

 

 

 

Read Previously Selected Adaptation Table

 

Displays tables of different sizes (kV stage dependent) after the filament has successfully been adapted.
Screen (or value line) 1/xx always displays the individual standby filament current at 100uA.
Screen xx/xx displays a filament current which is just one step above the limit filament current.

If  [mA] :

 

filament current

lowest value

highest value

 

=

=

 

standby filament current

upper filament current limit + a little bit on top

 

 

table size depends on the filament current mA steps (individual for every kV stage)

Ie  [uA] :

 

emission current at the given filament current

boost time  [ms] :

 

how long it takes to boost up from a specific emission current (filament temperature) to a higher emission current (higher temperature) with the boost current = max filament current  + 2A  (positive boost)

blank time  [ms] :

 

how long it takes for the filament to ‘cool down’ from a specific emission current to a lower emission current (negative boost)

 

 

to get to a lower mA value the filament current goes down to 0.5A
(0.5A is required as lowest current to feed a grid switch unit, if present)

 

 

typically the negative boost time is 2-3 times positive boost time