Radiation Leakage; Earth Resistance; Wall Mounted Systems; Mobile Systems - GENDEX Oralix AC Manual De Servicio

ORALIX AC SYSTEM
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
cross under the 25% of the I
e) the figure bellow shows the measurement for 120ms exposure time; the acceptance is : 120ms+/-
(10%+1ms) = from 107ms to 133ms.
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 µGY/h (5 mR/h) as specified. (See
Section A).
The prescribed duty cycle factor (1
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.
Gendex Dental Systems
.
peak
WARNING
Printed on: 22 Mär 2012, 09:28:10 am; Printed by: TOBIAS BAUER
NOTE
shall be taken into account in the calculations, in
4519-190-70943_4
ACCEPTANCE
and the last
peak
D-3