Chapter 5 Web-Based Operations
108 Lynx II DSA User's Manual - 7096089
Fast Disc Shaping
Sets the digital filter’s Fast Discriminator to Normal or Low Energy mode to optimize the
fast discriminator shaping for the selected detector type.
• Normal: The Fast Discriminator shaping is optimized for Ge detectors and general
gamma spectroscopy. The fast discriminator filter rise time is set to 100 ns.
• Low Energy: The Fast Discriminator filter rise time is set proportional to the slow
shaping rise time selection.
Slow Disc Mode
Selects the threshold mode for the digital filter’s slow shaper discriminator. Can be set to
Manual or Automatic. Default is Automatic, in which case the slow shaper’s threshold is
automatically optimized above the system noise level. In Manual mode, the threshold is
set through the Manual Slow Disc setting. Manual mode is useful when working with low
energy applications. Please refer to the SDisc Setting on page 51 and the Low Energy
Applications on page 111 for more details.
Manual Slow Disc
Sets the digital filter’s slow discriminator when the Slow Disc Mode is set to Manual.
Setting ranges from 0.0% to 100.0%. Manual mode is useful when working with low
energy applications. Please refer to the FDisc Setting on page 49 and the Low Energy
Applications on page 111 for more details.
Fast Disc Mode
Selects the threshold mode for the digital filter’s fast shaper discriminator. Can be set to
Manual or Automatic. Default is Automatic, in which case the fast shaper’s threshold is
automatically optimized above the system noise level. In Manual mode, the threshold is
set through the Manual Fast Disc setting.
Manual Fast Disc (%)
Adjusts the Fast Discriminator threshold parameter applied when Fast Disc Mode is set to
Manual mode (see Fast Disc Mode). This allows manual adjustments above the spectrum
noise level ranging from 0.00% to 100.0%. Refer to the FDisc Setting on page 49 for more
details.
Rise Time (µs)
Symmetrically sets the rise time and fall time of the digital filter time response. As with
conventional Gaussian shaping, the degree of noise filtering depends on the rise time
selection. The Rise Time setting ranges from 0.2 to 51.0 µs.
Note: Having the ability to independently set the Rise Time and Flat Top allows greater
flexibility when optimizing the processing time or shaping for a wide variety of
detector applications.
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