Hologic QDR 4500 - Page 78

QDR
®
4500 Technical Manual
3-22
Figure 3-19. Tube Current Mode 1
11. Press <F1> to turn on the X-rays.
12. Observe the oscilloscope. You should see a trace similar to Figure 3-20, approximately
4ms pulses with a peak amplitude of 10v (ignore the overshoot and measure current on
the back, after it settles out). This corresponds to 10mA
±
35% tube current.
If the scope trace seen in either Figure 3-19 or Figure 3-20 is not as shown, the system may have
a faulty X-ray Controller or tank.
Figure 3-20. Tube Current Mode 3
Note:
Enter this information into
The Radiation Measurement Report
(see page 3-28).