InnoVet Select
™
HF APR
Service Manual
76
12.0 ACCURACY TESTING
12.1 Overview
Once the 20 kHz APR generator has been installed and calibrated, the outputs must be
verified. Record the kVp and mAs values, ensuring that they are compliant with the
accuracies stated in this manual, as well as federal and local guidelines.
Note: When calculating kVp or mAs accuracy, the test equipment accuracy must be
subtracted from the stated generator accuracy. If the kVp output is within this new
performance standard then the kVp is certain to be within the generator
specifications, even if the test equipment is at the maximum of it’s error range.
The formula for this calculation is:
(Generator accuracy)
−
(test equipment accuracy) = performance standard.
For instance, if the generator kVp accuracy is 5% and the test equipment has a 2% error,
subtract 2% from 5% to achieve a new required system accuracy of ±(3%+1) kVp.
SAMPLE CALCULATIONS:
For 40 kVp, the output must be within ± (40 x 3%) + 1 = (1.2) + 1 = 40 kVp
±
2.2 kVp.
For 100 kVp, the output must be within ± (100 x 3%) +1 =
±
(3) + 1 = 100 kVp
±
4 kVp
These sample calculations are for kVp with a 2% test equipment error. The kVp or mAs
output measured and the accuracy of the test equipment used will be different than in
these samples, but the method of generating the system accuracy will be the same.
