5. Adjust this amplifier’s gain until these peaks are seen in the MCA spectrum.
The RDY LED of the selected Amplifier/TCA will be blinking.
6. If all modules are to be set for the same energy range, TCA polarity, PUR,
and Auto Threshold mode, select “Apply to all Amp/TCAs”.
7. When the SCA calibration is complete, the MCA spectrum can then be
calibrated. You must position the cursor on one peak centroid and select
which SCA (1, 2 or 3) it corresponds to. This would normally be the highest
energy peak.
8. Now calibration steps 3 through 6 can be repeated for the remaining
Amplifier/TCA modules or, alternatively, to perform a Gain Normalization.
9. The Gain Normalization procedure uses the calibrated MCA and allows
individual amplifiers to be selected and to manually adjust their Gain to
position the spectrum at the proper locations. This will match the amplifier’s
gains to the calibrated module. The SCAs are forced to be at the widest limits
and allow all pulses to be converted. Once again, the selected Amplifier/TCA
will have its RDY LED blinking to aid in locating the amplifier to adjust.
46
Performance Adjustments
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