Table of Contents
Advertisement
ORTHORALIX 9200
Service Manual
3.6.
REPRODUCIBILITY
To perform the reproducibility test proceed as follows:
(1)
Dismount the collimator.
(2)
Place the dosimeter at 20 cm. from the focus.
(3)
Inhibit the movements during the test exposures.
(4)
Select 70 kV - 10 mA - 0.80 s
(5)
Make a series of 10 exposures within a 1 hour period and
take note of the value of the radiation dose after each
exposure.
3.7.
RADIATION LEAKAGE
Measure radiation leakage at 100 cm from the focus in any direction,
and check that the dose rate values for the combination tubehead
and collimator are lower than 250 G/h (28 mR/h) as specified.
W
T
e h
p
e r
c s
b i r
d e
u d
y t
y c
l c
f e
c a
i
t n
e h
a c
c l
l u
i t a
n o
, s
n i
o
d r
r e
3.8.
EARTH RESISTANCE
The Orthoralix system requires a fixed installation, therefore the
resistance between any exposed conductive part and the earth
terminal of the mains input contactor has to be lower than 0.1 Ohm.
Disconnect the unit from the mains and measure with the Bonding
tester.
DENTSPLY Gendex
A
R
N
N I
G
r o t
1 (
2 /
) 0
h s
l a
b l
t e
k a
n e
n i
o t
o t
b o
i a t
t n
e h
c
r o
e r
t c
o d
e s
a r
e t
3.9.
EARTH LEAKAGE
Measure the earth leakage currents in all conditions, using the
circuit arrangement shown below.
Check that the results conform to the table below:
S
1
O
F
F
O
F
F
O
N
O
N
O
F
F
O
F
F
O
N
O
N
a
c c
u o
t n
d
r u
n i
g
e
p x
o
s
g i f
r u
. e
L
MAINS
N
V
= DIGITAL VOLTMETER INPUT IMPEDANCE = 10 M OHM
R
= 1K OHM +/- 1%
C
= 0.15 uF +/- 5%
T
= K1 INSULATION TRANSFORMER
L
= LINE TERMINAL
N
= NEUTRAL TERMINAL
(03.0)E
S
2
S
3
O
F
F
O
N
O
N
O
N
O
F
F
O
N
O
N
O
N
O
F
F
O
F
F
O
N
O
F
F
O
F
F
O
F
F
O
N
O
F
F
u
e r
T
S1
S3
C
S2
R
V
Section D
M
A
. X
L
E
A
K
A
G
E
C
U
R
R
E
N
T
(
m
) A
<
5
<
5
<
5
<
5
<
1
0
<
1
0
<
1
0
<
1
0
<
1
0
L
N
ORTHORALIX
P.E.
D-3
D-3
Advertisement
Chapters
Table of Contents
