Shift+F2 – Additional Test Menu
Gem-5 User’s Manual 213
• Ctrl+Home brings up Detector 1.
• The “Gamma Sum Zone All” (background) sum zone is available
(Ctrl+End).
• The number of background values available for average is 1080.
• The HV is turned on while on this screen.
• The Keys showed at the bottom of the display depend on the Methodology
selected (see page 46).
Shift+F2 – Additional Test Menu
The Shift+F2 – Additional Test Menu showing special tests, shown in Figure 40 on
page 73, is accessed from the main Service Menu (on page 81). It provides access a
special procedure used to determine the optimum high voltage settings for Gamma
scintillation detectors as well as tests appropriate self shield factors for various
operating modes. In the case of various gate and barrier options, the F3 – Test
Auxiliary Sensor Board and F7 – Barrier Exerciser choices appear.
The HV is turned off when Shift+F2 – Additional Test Menu screen is started.
The Menu Items avaliable are:
• F1 – Optimize Gamma HV (see page 82),
• F2 – Optimize Self Shield Factors (see page 213),
• F3 – Test Auxiliary Sensor Board (see page 218),
• F7 – Barrier Exerciser (see page 219).
F2 – Optimize Self Shield Factors
Self Shield Factors are required when the ambient Gamma background field is
attenuated by the occupant being measured or by the service technician performing a
procedure. These factors ideally would reduce the measured Gamma background by
the amount blocked by the occupant allowing correct alarm limits to be applied. In
practice, the ambient field may fluctuate and each occupant is a different size and
shape.
The Optimize Self Shield Factors procedure consists of a number of test screens that
are accessed in sequence to facilitate collection of data to determine appropriate self
shield factors for various operating modes. It is accessed by selecting Shift+F2 on
the F2 – Setup Menu and then F2 – Optimize Self Shield Factors. Note that the
Optimize Self Shield Factors screen is just a convenience for determining appropriate
settings; additional keystrokes, which are identified on the display when settings are
calculated, are required to apply these settings to individual detection zones. Refer to
line item Self Shield Factor on the F2 – (Zone) Settings screen (on page 116) for a
further discussion on the use of self shield factors.
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