Fluke Biomedical 10100AT - Manual (Page 43)

Operation
Using the Ion Chamber Test Stand and Accessories
2
2-25
3. 26 kVp Measurement Procedure: Repeat the baseline measurement at a slightly higher kV setting
that should still be below the k-edge (26.7 kV). Set the generator for 26 kVp. Press the
RESET/MEASURE button. The display should read:
Make an exposure. The new voltage should be the same as the previous voltage ± 0.020 V as in
the following representative display.
If the voltage is within the limits, this is the base voltage. Proceed to step 4. If the voltage is outside
the limits, repeat steps 2 and 3 at 24 kVp and 25 kVp respectively.
4. 29kVp Measurement Procedure: Do NOT press RESET/MEASURE. Set the generator for 29
kVp. Make an exposure. If the exposure is within the range 27.5 to 29.5 kVp, the reading is
accurate. If ---.-kVp is displayed, set the generator for 28 kVp and repeat step 4. If 0.0 kVp is
displayed, set the generator to 30 kVp and repeat step 4. The last displayed k-edge kVp is used to
determine linear correction as in the following example.
Once an accurate determination of kVp has been made do not disturb the x-ray generator settings.
Proceed to linear mammo filter pack use.
2.11.4.2 Linear Filter Pack Use
If the Model 35080/80A/80B kVp Divider changes position in the x or y axis with respect to the x-ray
generator during the linear kVp measurements, you must repeat the determination of the k-edge kVp and
the correction value since this measurement is position sensitive.
1. Linear filter pack Setup: Select the linear filter pack using the DETECTOR SELECT button and
the UP or DOWN button on the Model 35050AT Dosimeter. Remove the k-edge filter pack and
replace it with the linear mammo filter pack. Increase the target to filter pack distance to about 15
inches (38cm). Press the RESET/MEASURE button. If the last kVp measured in step 4 is an
acceptable value for the k-edge, the instrument will proceed to step 6. If the kVp is not acceptable,
the instrument will proceed to step 8 with kVp correction turned off.