Chapter 5 Web-Based Operations
114 Lynx II DSA User's Manual - 7096089
Mode
Sets the Gain Stabilization mode to Off, On, or Hold.
• Off disables the spectrum stabilization, and resets the correction to the system gain
back to zero.
• On enables gain stabilization by allowing the Stabilizer to continuously monitor the
incoming data during acquisition and compare its rate against a pre-established
reference, adjusting the system gain as necessary to maintain a stable ratio.
• Hold suspends the spectrum stabilization and retains the current correction to the
system gain until the Stabilizer is switched to either Off or On. The stabilizer will
automatically switch the mode to Hold when an over-range or under-range
condition develops.
Divider
The Gain Rate Divider is a factor by which the level of correction applied to the system
gain is reduced. This value in effect determines the aggressiveness of the stabilization
algorithm. The algorithm becomes less aggressive as the correction divider is increased.
Spacing
Sets the spacing (in channels) between the upper and lower sampling windows. The
windows should be placed so that a shift in the reference peak reflects a significant change
in count rate through the window. For broad peaks, the spacing should be set so that the
windows’ edges are not on the flat part of the peak.
Window
This adjustment sets the width (in channels) of the upper and lower sampling windows on
either side of the gain reference peak. For best results, the windows should be placed so
that a shift in the reference peak reflects a significant change in the count rate through the
windows.
Centroid
The Centroid parameter sets the centroid (as a channel number) of the reference peak at
the high end of the spectrum that will be used for gain stabilization. The centroid channel
becomes the focal point for the stabilization algorithm.
Use Cursor
Pressing the Use Cursor button will transfer the channel number at the current cursor
location into the Centroid field.
Ratio Mode
Determines the source of the ratio value used for stabilization control. Manual uses the
value set through the Manual Ratio setting, and Automatic allows the Lynx II to calculate
the value automatically when acquisition and stabilization are active. For most typical
applications this setting should be set to Automatic.
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