Fluke Biomedical 35080M - Manual (Page 53)

35080M
Operators Manual
A-2
4. Measure the peak voltage and record in box A on the accompanying data sheet. (Figure A-2.)
Part B
1. Set the generator for 26 kVp and make an exposure.
2. Record this voltage value in box B on the data sheet (Figure A-2). (The voltage values, A and B,
should be equal to within ± 0.020V; if so, this will be your BASE VOLTAGE; if not, then repeat the
above steps, at one kVp lower.)
Part C
1. Set the generator for 29 kVp and make an exposure.
2. Measure the peak voltage. (If this voltage is greater than the BASE VOLTAGE by 0.1V but not
greater than 0.25 V above the BASE VOLTAGE, record in box C (Figure A-2). If the voltage is
greater than 0.25 volts above the BASE VOLTAGE, repeat this step at one kVp lower. If the
voltage is not greater than the BASE VOLTAGE by 0.1 volts, repeat this step at one kVp higher.)
Part D
Repeat the last measurement to verify that the generator is repeatable. The voltage reading should
repeat to within 0.020 V. If the reading is not repeatable, the generator needs service.
Part E
1. Subtract the BASELINE voltage from the voltage measured in Part C, step 2 (box).
2. Multiply this voltage by 10, add to 27.0, and record in box D (Figure A-2). This is the true kVp for
this station.
3. Set the scope for single sweep, storage mode, and in the ‘‘DC’’ input mode.
PROCEED TO LINEAR MEASUREMENT - DO
NOT CHANGE THE GENERATOR SETTINGS.
A.3 Linear Measurement
MEASUREMENT SETUP
1. Replace the Cadmium K-edge Mammo Filter Pack (37355) with the Linear Mammo Filter Pack
(37351).
2. Reposition the Model 35080 kVp Divider to approximately 15 inches from the focal spot (see Figure
5-3).
OSCILLOSCOPE SETUP
1. Set the vertical sensitivity to 0.05 volts per division.
2. With the input switch in the ‘‘GROUND’’ position use the vertical position control to place the trace
on the bottom graticule line.
3. Set scope for single sweep, storage mode, and in the ‘‘DC’’ input mode.
NOTE