CAPINTEC, INC.
CRC
®
-712MH
Reassignment of a Preset Push-Button
The calibrator provides eight preset radioisotope selection buttons for a quick setting of the
most often used isotopes.
As users requirements are different for each nuclear medicine facility, the following
procedure is provided to re-assign these preset buttons. (Refer to Figure 4-3).
1. Verify that the Zero and Background adjustments of the calibrator are within the
specified limits. (Reference CHAPTER 5: QUALITY ASSURANCE AND
ACCEPTANCE TESTING; SECTION: ACCEPTANCE TESTING.)
2. Press
the
OTHER
push-button and set the Calibration Control to the calibration
number assigned to the radioisotope being preset into the instrument. (obtained from
the Calibration Card or the table in Appendix II)
3. Insert any radioisotope of substantial activity (enough to display 100µCi [3.7MBq] or
higher; if possible, 0.5mCi [18.5MBq] or higher) into the calibrator well.
4. Record the activity displayed, including the decimal point and the units.
5. Remove the push-button being re-assigned by gripping it with pliers and pulling
straight out.
6. Activate the switch being re-assigned by pressing the white “fingers” that held the
button with a screwdriver.
7. With a small screwdriver, adjust the potentiometer directly above the button being re-
assigned until the display coincides (to within, ±5%) with the activity recorded in Step
4.
8. Replace the re-assigned push-button with the correctly labeled button. (Replacement
buttons are available from Capintec.)
Note: If the RS-232 data-logging printer option is used, the program EPROM located in the
readout unit will have to be changed. Consult Capintec’s Authorized Service Center
concerning custom program EPROMs for the different isotope selections.
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SYSTEM SETUP
January 08
