4519-190-70943_4
D-3
ORALIX AC SYSTEM
ACCEPTANCE
Gendex Dental Systems
b)
make an exposure with an exposure time greater than 160ms; measure the peak value of the waveform
and record it as I
peak
.
c)
select the desired exposure time and make an exposure.
d)
on the obtained waweform measure the time between the first cross over the 25% of the I
peak
and the last
cross under the 25% of the I
peak
e)
the figure bellow shows the measurement for 120ms exposure time; the acceptance is : 120ms+/-
(10%+1ms) = from 107ms to 133ms.
NOTE
Using non-invasive instruments for these measumerents does not allow a proper verification
of the compliance to the IEC Standard.
Perform the test at different tecnique, patient, and film speed selections, and verify that the measured exposure
time is corresponding to the displayed exposure time (within the acceptable accuracy). (see AZ-5)
3.5.
RADIATION LEAKAGE
Perform radiation leakage measurements at 100 cm from the focus in any direction, and verify that the dose
rate values for the combination Tubehead and collimator are lower than 45
µ
GY/h (5 mR/h) as specified. (See
Section A).
WARNING
The prescribed duty cycle factor (1
shall be taken into account in the calculations, in
order to obtain the correct dose rate figure.
3.6.
EARTH RESISTANCE
3.6.1. Wall mounted systems
The Oralix wall mounted system requires a fixed installation, therefore the resistance between any exposed
conductive part and the earth terminal of the Timer has to be lower than 0,1 Ohm.
Disconnect the unit from the mains and measure with the Bonding tester.
3.6.2. Mobile systems
The Oralix mobile system is an equipment provided with protective earth conductor in non detachable flexible
supply cord, therefore the resistance between the earth pin of the mains plug and any exposed conductive part
of the X-ray installation has to be lower than 0,2 Ohm.
Disconnect the mains plug from the socket and measure with the Bonding tester.
Printed on: 22 Mär 2012, 09:28:10 am; Printed by: TOBIAS BAUER
