Del Medical DynaRad Phantom-8000, Installation, Operation & Service Manual

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Phantom Installation, Operation & Service Manual
Calibration 5-3
5.2.1 Equipment setup
Connect the mAs (Keithely model 35035) meter to the phone jack (J4),
located in the bottom plate of the X-ray tube head. Load the kVp divider
(Keithely model 35080A) with the 50 = 135 kVp filter pack #37946 and
place it in the X-ray field, being careful to collimate down to the size of the
filter pack. Set the function switch to Run.
Connect the kVp divider cable to the oscilloscope (storage type) and set up
the scope as follows:
Connect X10 probe to test point TP12 of the control board (#500978).
Connect the ground clip to the top (ground) side of CR15 for a positive
going signal.
Connect to channel 2 of the oscilloscope and set up as follow:
Table 5-2: Channel 1 Settings
5.2.2 Pre-Calibration (only necessary if replacing an X-ray tube)
Attach a DVM to TP6 on PCB #500978 (located on the generator
assembly), using R12, set TP6 to 18.00V
Attach a DVM to TP13 on PCB #500978 (located on the generator
assembly), using R28, set TP13 to -10C
Set the dip switches as shown in row 18 of Table 5-3 (binary capacitor
chart).
Set the service switch to position 1, set the kV to 80, set mA to 15 and time
to 0.1 sec. Make exposure and note the leading edge of the kV waveform.
Volts/Div: 0.1 Display: Set to storage
Time/Div: 20 mS Source: Channel 1
Ground input/trace: Lower line Input: DC
Mode: Channel 1 Trigger mode: Single
Pre trigger: 2 divisions Push “Ready”
Table 5-1: Channel 1 Settings
Volts/Div: 0.2 Display: Set to storage
Time/Div: 20 mS Source: Channel 1
Ground input/trace: Lower line Input: DC
Mode: Channel 2 Trigger mode: Single
Pre trigger: 2 divisions Push “Ready”