NOTE:
The Department of HS recommends a standard of plus or minus 4 kVp to the
indicated kVp reading.
4-5.
PREVENTIVE MAINTENANCE
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.
4-6.
CORRECTIVE MAINTENANCE
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
4-7.
PURPOSE
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.
NOTE:
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)
Figure 4-6. Spin top test tool.
MD0062
4-8