Gendex ORTHORALIX 9200 Service Manual page 62

To measure exposure time, a timer counter can be used connected
basic accuracy for exposure time measurement of the radiation
monitor must be considered.
MODE
CEPH
CEPH
CEPH
Check that the results conform to the specification.
D.3.5 Radiation dose rate
Dismount the collimator and place the dosimeter at 20 cm from
the focus.
the dose rate in R/min.
kV mA
60 10
70 10
80 10
Check that the results conform to the specification, with a toler-
ance of ± 30%.
D.3.6 Reproducibility
1.
Dismount the collimator.
2.
Place the dosimeter at 20 cm from the focus.
3.
4.
Select 70 kV - 10 mA - 0.80 s
5.
posure.
Gendex Dental Systems 4519-190-71193-7
EXPOSURE TIME (s)
12
0.16
1.00
2.50
6
8
DOSE RATE
s
Gy/s R/m
1 6.1 42
1 8.3 57
1 10.2 70
Printed on: 20 Apr 2012, 04:59:40 pm; Printed by: UWE.ZELLER
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
terminal of the mains input contactor has to be lower than 0.1
Ohm.
S1 S2 S3
-
OFF OFF
OFF
OFF
OFF OFF OFF
OFF OFF
OFF OFF
OFF
V
-
R
C
T = K1 insulation transformer
L = Line terminal
N
D-3
ORTHORALIX 9200 Service Manual
MAX. LEAKAGE CURRENT
(mA)
< 5
< 5
< 5
< 5
< 10
< 10
< 10
< 10
< 10
(06.0)E
-
-