Chapter 5 Web-Based Operations
112
Lynx DSA User's Manual - 9240227J
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, making adjustments to 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 by. 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 focus 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 to be used for stabilization control.
Manual
uses the value set the through the Manual Ratio setting, and
Automatic
allows the
Lynx to calculate the value automatically when acquisition and stabilization are
active. For most typical applications this setting should be set to
Automatic
.
