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Operation
Operation Instructions 2
2.4.10.1 Changing Front Panel Gain Factor's From the Measurement Screen
The five FPGF's may be set by adjusting the measurement readings to achieve a set of desired values. Press the MEASURE SELECT button until the desired Measurement screen is displayed. Press the GAIN SELECT button to advance the "X" cursor among the five measurement values. Next use the UP and DOWN buttons to adjust the selected measurement value.
When the measurement values are displayed in the absolute form, see Figure
dose value by 2% will increase the left FPGF by 2%.
Figure 2-26. An Absolute Dose Measurement With the Center Ion Chamber Selected for FPGF Modification
When the measurement values are displayed in the
When the measurement values are displayed in the
absolute dose value by 2% will increase all five of the FPGF's by 2%.
Figure 2-27. A Percentage Dose Measurement With the Left Ion Chamber Selected for FPGF Modification
2.4.10.3 Saving the FPGF Changes
To save any changes made to the FPGF's, press and hold the GAIN SELECT button for approximately three seconds. These settings become permanent and will be used when the 35360A TRACKER Display displays the FPG annunciator.
2.4.10.4 Aborting the FPGF Changes
To abort any changes made to the FPGF's, turn off the instrument while in the Gain Setting Mode. This causes the 35360A TRACKER Display to discard the new FPGF settings and use the values previously stored.