F1 – Optimize Gamma HV
Gem-5 User’s Manual 87
Note that instead of trying to test them, detectors put in Conditional Service on the
Faults screen show the words “Conditional Service” in place of the F1 = Collect
Background Data and the F2 = Collect All Gamma Detectors descriptions. In
addition, these detectors grey out the F3 = Stop Background (or Source) Data
choice. The High Voltage, Minimum Volts, Maximum Volts, Step Volts, Dwell
Time and Maximum Rate settings for any detectors in Conditional Service are still
changeable so that one may use these to possibly correct a fault that might have taken
the detector Out of Service in the first place.
F4 = Clear Data: clears the data and moves OptimizeHV*.CSV file to the Windows
Recycle Bin (so that it can be restored).
Ctrl+F8 = Set All Detectors = to this one sets all detectors of same type to match
settings of detector shown.
F5 = Re-plot Graph is only available while viewing the Efficiency or Monitor Time
graphs. When pressed it re-plots both Efficiency and Monitor Time graphs to match
current setting. It is intended to be able to correct graphs if Source Data was
collected with the wrong or no “Source ID” being set. It also corrects Monitor Time
graph if Alarm Setting has changed since data was collected.
• Step Volts default is 25 V for all types of detectors.
• Minimum Volts starting level for the optimization.
• Maximum Volts is the maximum voltage for the optimization.
• Dwell Time default is 15 s for Gamma detectors.
• If the expected name “Optimize…CSV” files from previous version is not
found, then previous name is tried. If previous name is found it is renamed to
the expected name (it also cycles through these names using other installed
language DLLs in case previous files were collected using language specific
names).
• HV is turned off when not collecting.
• Status area shows: “Discriminator XXXX V” “ULD XXXX V”. “Source
Used <source data>”. These indicate the conditions under which the data
was acquired.
• When collecting HV for PMT based detectors a count rate going ≥
Maximum Rate does not stop collection.
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