Maintenance
8-3
aluminum sheet of the X-ray output, press the exposure hand switch level 1, make
sure the filament at the X-ray output is turned on normally, and then release the
hand switch.
【Caution】: Before exposure, the operator should make sure that the
shielded room is closed.
b) Use the hand switch for exposure. After the exposure is over, check the measured
kV value of the X-ray quality tester. If the measured kV value is (100 ± 5) kV, the
test is passed. If the kV value is out of range, fine-tune RP3 on the SYS board and
perform the exposure again till the kV value is within the range. Meanwhile, the kV
and mA output waveforms shall have no glitches and abnormalities. The proper kV
waveform is as shown Fig.8-1 below.
Fig. 8-1
c) Check the kV and mA feedback values on the oscilloscope. The kV feedback
value measured from the oscilloscope shall be (2.5±0.1) VDC, the mA feedback
value shall be (2.4±0.1) VDC, and the kV waveform duration is (100±5) ms.
d) Set the loading conditions of the control panel to 125kV ,25mA,2.5mAs. Under this
exposure condition, repeat the exposure operation multiple times. If the KV value
monitored by the X-ray quality tester is always maintained within the (125±5) kV
range, and the kV feedback monitoring value on the oscilloscope is (3.125±0.1)V,
the kV is passed.
4) X-ray tube current calibration
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