The Department of HS recommends a standard of plus or minus 4 kVp to the
indicated kVp reading.
Perform preventive maintenance tests routinely at three-month intervals as well
as any time service work is done on the machine. That would be any work that would
affect the system calibration and any time an x-ray tube is replaced. Be sure to check
that more testing was done before the service person leaves.
Corrective maintenance should be done, when the measured kVp is more than
plus or minus 4 kVp difference than the indicated kVp.
Section II. ELECTRONIC X-RAY TIMING AND MILLIAMPERES TEST
The electronic x-ray timing and mAs test is to assure that the exposure time and
the mAs set on the radiographic equipment are correct.
A manual spin-top test may be used to check the timing system of single-
phase equipment ONLY. A spin top cannot be used on three-phase
equipment, but an electronic timer can be used on BOTH types of units (see
Figure 4-6. Spin top test tool.