ORTHORALIX 9200
Service Manual
D-3
Gendex Dental Systems 4519-190-71193-7
To measure exposure time, a timer counter can be used connected
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basic accuracy for exposure time measurement of the radiation
monitor must be considered.
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MODE
EXPOSURE TIME (s)
1"/ 45"/%"3%
12
CEPH
0.16
CEPH
1.00
CEPH
2.50
$&1) %%&0/-:
6
$&1) %%&0/-:
8
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Check that the results conform to the specification.
D.3.5
Radiation dose rate
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Dismount the collimator and place the dosimeter at 20 cm from
the focus.
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-
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the dose rate in R/min.
kV
mA
s
DOSE RATE
P
Gy/s
R/m
60
10
1
6.1
42
70
10
1
8.3
57
80
10
1
10.2
70
Check that the results conform to the specification, with a toler-
ance of ± 30%.
D.3.6
Reproducibility
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1.
Dismount the collimator.
2.
Place the dosimeter at 20 cm from the focus.
3.
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4.
Select 70 kV - 10 mA - 0.80 s
5.
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-
posure.
%
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-
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tubehead and collimator are lower than 250 µGy/h (28 mR/h) as
specified.
The prescribed duty cycle factor (1/20) shall be
taken into account in the calculations, in order to
obtain the correct dose rate figure.
D.3.8
Earth resistance
The Orthoralix system requires a fixed installation, therefore the
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terminal of the mains input contactor has to be lower than 0.1
Ohm.
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-
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%
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S1
S2
S3
MAX. LEAKAGE CURRENT
(mA)
OFF
OFF
0/
< 5
OFF
0/
0/
< 5
0/
OFF
0/
< 5
0/
0/
0/
< 5
OFF
OFF
OFF
< 10
OFF
0/
OFF
< 10
0/
OFF
OFF
< 10
0/
0/
OFF
< 10
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< 10
V
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R
,0).
C
V'
T
= K1 insulation transformer
L
= Line terminal
N
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(06.0)E
Printed on: 20 Apr 2012, 04:59:40 pm; Printed by: UWE.ZELLER