After hardware installation, the overall system function should be verified. Before doing this, please study the myQA Accept Instructions for Use. You need to know how to start the software and setup/define the equipment. The following functions should be verified:
- Servo movement
- Electrometer control
- High voltage
Servo Movement
Verify the servo movement functions as follows:
- Ensure that the CCU is switched on and that it is connected to the computer.
- Establish Ethernet connection via XX setup tool.
- When performed, close the XX setup program.
- Start the myQA Accept program.
- Define the equipment under Common Settings > Equipment Setup (at least the controller should be defined).
- With the movement keys on the remote control, drive the servo mechanics to the following point: Middle of the phantom (position 0 on the rulers) in the horizontal dimensions X and Y, and upwards (e.g., position 160 mm) in Z.
CAUTION: MOVING PARTS (WATER PHANTOM)
Follow the instructions on the label to avoid injury to fingers. Keep your hands away during movement of the phantom mechanics. - At this position, define isocenter and water surface with the remote control at the phantom. Refer to
Section 2.1.2 for detailed information about how to use the hand control. - Open the Measurement menu and pin the Controller window in the Measurement window.
- Click the Connect icon at the left menu bar to establish a connection between software and control unit.
- Choose Servo as the coordinate system in the Controller panel tab. Check that the displayed position is displayed as 0, 0, 160 mm (X, Y, Z).
- Select the Positioning panel to use the Go to drop-down menu to enter a position, e.g., 100, 100, 100 mm, and confirm two times by pressing the Return key at the computer keyboard.
Electrometer Control
- Ensure that the High Voltage (HV) in the CCU Control Panel is set to zero (Electrometer panel tab).
WARNING: HAZARDOUS VOLTAGE
The HV outputs of the CCU provide hazardous voltages of up to 500 V DC. Do not switch on mains power until all cables are connected. Always set the HV to zero before connecting or disconnecting detectors. - Connect detectors (recommended: CC04 ionization chambers) to the Field and Reference inputs on the CCU by usage of the two 5 m detector extension cables.
- Move the field detector to the central beam, at approx. Dmax depth.
- In the Electrometer panel, set a High Voltage of +300 V for both channels and select Ratio.
- Press the Background button to perform a background measurement. Wait until the measurement is finished.
- Turn on the accelerator.
- When the beam is stabilized, press the Normalization button. Wait until the normalization procedure has finished.
- Turn off the accelerator.
- Now unselect Ratio in the Controller panel.
- Define a profile scan in the Queue Setup window.
- Run the scan with accelerator off in the Measurement window. Check that the displayed offset signal (background) is low: not more than 1 pA. The current is updated only under measurement.
- In the CCU Control Panel, under Channel, select Ratio.
- Turn on the accelerator.
- Perform the profile scan.
- Turn off the accelerator.
- Check that the profile scan was properly performed.
HV Test on CCU
- In the Controller panel of the SW, switch off the high voltage by clicking HV Setup button (if the high voltage is on).
- Disconnect the detectors.
- Connect a high impedance voltmeter to the Field Sensor (1) and Reference Sensor (2) inputs of the CCU.
CCU front side - In Common Settings - Equipment Setup – Detectors window, select a detector and set the Default Bias Voltage value between -300 V and +300 V.
- In the Controller panel, turn on the high voltage by clicking the HV Setup button.
- Measured voltage with the voltmeter. With 100 M impedance, the measured voltage should be the same the value set for the Default Bias Voltage with a few percent deviation.