Sedecal SHF-310 - Page 427

IMPORTANT NOTE FOR AUTO-CALIBRATION
Auto-calibration procedure of “Digital mA Loop Open” (Filament Current Numbers)
is the recommended method to achieve the most accurate calibration. In any case,
Auto-Calibration is a help for the Manual Calibration procedure that can be
performed at any moment or when Auto-calibration procedure is not fully performed.
(Refer to Section 2.5 “Digital mA Loop Open” in the Calibration document).
During the Auto-calibration process, the Generator informs about different conditions
through messages or codes displayed on the Console. The table below is a resume of
these situations:
MESSAGE / CODE SITUATION
“TUBE OVERLOAD”,
“GENERATOR OVERLOAD”,
ETC
The Generator can not calibrate in this moment the s elected kV / mA combination
(because anode overheated, space charge, generator power limit, etc...). In this
case, the Generator will continue with Auto-calibration of the following available
kV/mA combination for the selected Focal Spot. At the end of the process it will try
to calibrate or calculate the combinations previously uncalibrated.
“CONFIRM” / “DISMISS”
This messa
g
e / code a
p
p
ears at the be
g
innin
g
of the
A
uto-calibration
p
rocedure to
“222”
T
h
i
s
m
e
s
s
a
g
e
/
c
o
d
e
a
p
p
e
a
r
s
a
t
t
h
e
b
e
g
i
n
n
i
n
g
o
f
t
h
e
A
u
t
o
-
c
a
l
i
b
r
a
t
i
o
n
p
r
o
c
e
d
u
r
e
t
o
confirm or leave the Auto-calibration procedure.
“TUBE TOO HOT”
Exposures are inhibited momentarily because the Heat Units capacity that remain
i
s
4
0
%
o
r
l
e
s
s
W
a
i
t
u
n
t
i
l
t
h
e
X
r
a
y
T
u
b
e
b
e
g
i
n
s
t
o
c
o
o
l
a
n
d
r
e
c
o
v
e
r
s
t
h
e
H
e
a
t
U
n
i
t
s
“111”
is 40% or less. Wait until the
X
-ray Tube begins to cool and recovers the Heat Units
capacity.
“AUTOCALIBRATION
FAILURE”
Auto-calibration procedure has been cancelled after ten attempts of calibration of
the same kV / mA combination. In this case, calibrate manually the k V / mA
combinations uncalibrated.
C
d
“
7
7
7
”
i
t
d
d
“
8
8
8
”
h
A
t
l
i
b
t
i
d
i
“777” or “888”
Code “
7
7
7
” appears instead code “
8
8
8
” when
A
uto-calibration procedure is
cancelled due to “space charge” during calibration of 40 kV at any mA station for
Small Focal Spot.
“AUTO CALIBRATION OK”
A
uto-calibration
p
rocedure has been success
f
ull
y
p
erformed for the selected
“999”
A
u
t
o
-
c
a
l
i
b
r
a
t
i
o
n
p
r
o
c
e
d
u
r
e
h
a
s
b
e
e
n
s
u
c
c
e
s
s
f
u
l
l
y
p
e
r
f
o
r
m
e
d
f
o
r
t
h
e
s
e
l
e
c
t
e
d
Focal Spot.
Auto-calibration procedure is indepen d en t fo r each Fo cal Spot. If Auto-calibration
has been successful for one of the F o cal Spots and aborted for th e o ther Focal Spot,
it is only required to perform the Manual Calibration of the mA station uncalibrated
for t h e o t h er Focal Spot. Enter in “Manual Calibration” mode, select each kV / mA
combination and identify the combinations that require to be manually calibrated
(these combinations keep the Filament Stand-b y valu e as F ilament Current
Number).