Figure 5-5. Measure the acceptable distance of 20 inches.
d. Repeat the test if the distance is outside the prescribed range. Always repeat
a test that gives inferior results. Perhaps the equipment needs adjustment, or perhaps
you made an error in performing the test. Anyway, before you call a service engineer or
a manufacturer's representative, you want to be sure that the repeat test results are the
same as the first test results.
a. Perform this test when a quality assurance program is begun.
b. Test the machinery when it is newly installed.
c. Repeat the test every time a fluoroscopic x-ray tube is replaced.
d. Test the equipment after every repair or service of any kind.