Calibration
Fluorographic Pulsed mA Accuracy Test
1. Power up the Workstation and allow the Workstation and C-Arm to boot completely.
2. Use the oscilloscope to monitor TP40 (HI_MA_SENSE) on the HVSR PCB. You will be converting voltages displayed on the
scope to tube current values:
A. TP40 to ground: 51.6 mV = 1mA
B. TP40 to TP49: 50 mV = 1 mA)
3. Use a second channel on the oscilloscope to monitor TP21 (KVP_SENSE_TP) on the HVSR. You will be converting
voltages displayed on the scope to kVp values (1 VDC = 15 kVp).
4. Press the
PULSE
button on either C-Arm control panel to enable the Pulse mode. Select 15 pps.
5. Set the C-Arm to 60 kVP @ 40 mA. Step on the HLF foot pedal to make a pulsed HLF exposure. Record the peak
amplitude of the pulses you see on TP40. Verify that the result is 40 mA +
4 mA (1.85 to 2.25 VDC).
6. Step on the HLF foot pedal to make another pulsed HLF exposure. Record the peak amplitude of the pulses you see on
TP21. Verify that the result is 60 kVp +4 kVp (3.67 to 4.29 VDC).
7. Set the C-Arm to 90 kVp @ 40 mA. Step on the HLF foot pedal to make a pulsed HLF exposure. Record the peak
amplitude of the pulses you see on TP40. Verify that the result is 40 mA + 4 mA (1.85 to 2.25 VDC).
8. Step on the HLF foot pedal to make another pulsed HLF exposure. Record the peak amplitude of the pulses you see on
TP21. Verify that the result is 90 kVp + 4 kVp (5.63 to 6.16 VDC).
9. Set the C-Arm to 120 kVp @ 35 mA. Step on the HLF foot pedal to make a pulsed HLF exposure. Record the peak
amplitude of the pulses you see on TP40. Verify that the result is 35 mA + 4 mA (1.59 to 1.99 VDC).
10. Step on the HLF foot pedal to make another pulsed HLF exposure. Record the peak amplitude of the pulses you see on
TP21. Verify that the result is 120 kVp + 4 kVp (7.60 to 8.12 VDC).
11. Power down the Workstation and take the High Voltage Supply Regulator off the extender. Install the HVSR PCB back in the
C-Arm chassis.
20
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Periodic Maintenance
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