LESSON 11
PROTECTIVE DEVICES QUALITY CONTROL TESTS
Section I. X-RAY TUBE PROTECTIVE CIRCUITRY TEST
11-1. PURPOSE
The x-ray tube protective circuitry test is to verify that the x-ray tube protective
circuitry is performing properly. The x-ray tube protective circuitry test is essential to the
quality assurance program. You, as a radiographer, need to be sure that this protective
device is functioning correctly at all times.
11-2. EQUIPMENT/MATERIAL
a. Tube rating chart.
b. Recording data forms.
11-3. PROCEDURE
a. Set the control panel to select.
(1)
90 kVp, x-ray generator control.
(2)
Maximum mA allowed from the tube rating chart.
NOTE:
Ensure the tube rating is for a small focal spot.
(3)
Maximum time allowed for kVp/mA from the tube rating chart.
(4)
Time, the closest time, not exceeding it.
b. Activate the x-ray tube protective circuitry.
(1)
Do not make an exposure.
(2)
Check the technique overload indicator.
c. Record the data on the form.
d. Select the next highest time.
(1)
Determine if the overload indicator activates on first time station.
(2)
Record the results of the overload indicator on the form.
MD0062
11-2
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