9600 Service Manual - gmecorp-usa.com

20 Generator Calibration
5R THEORY - S/N 69-0001 TO 69-1160
The purpose of this procedure is to ensure compliance with FDA requirement 80-8035,
Section 1020.32, part D2 for systems manufactured before May 19, 1995. This
requirement refers to the maximum FLUORO dose rate output of 5R/min. To ensure
compliance, the 9600 is limited to 4.63 R/min in all FLUORO modes of operation (except
BOOST). 4.63R/min is used instead of 5R/min to allow for worst-case equipment
tolerances used to calibrate the system.
To satisfy this requirement, the mA Limit File must be modified within generator
software. This prevents the 9600 from exceeding 4.63R/min. The reason to limit the mA
is shown in the following examples.
Example 1
With the tube current set to 5.0 mA, the 4.63 R/min is exceeded at approximately 90 kV
and above. This is shown in the gray area of the graph.
Figure 5 - Dose Output Exceeds 5R/Min