Maaintenance
8-3
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 (3±0.1) VDC, and the kV waveform duration is (100±5) ms.
d) SSet the loading conditions of the control panel to 125kV ,40mA,4mAs. 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
Perform exposure at 40kV ,20mA, 2.0mAs. The mA feedback value shall be (1.5±0.1)
VDC, and the rise time of the mA waveform front shall be within 10ms, and the mA
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