LLD
Sets the devices Lower Level Discriminator (LLD) as a percentage of the ADC’s full
scale.
Conv. Gain
Sets the device’s conversion gain. It can be set from 256 to the maximum number of
channels supported by the device. The gain will change by a factor of two. Note that
this value is automatically copied down to the Lynx’s internal Conversion Range pa
-
rameter.
FDisc Mode
Sets the device’s Fast Discriminator threshold mode. AUTO allows the threshold to be
optimized automatically above the system noise level; MANUAL allows the threshold
to be manually adjusted.
FDisc Setting
Sets the device’s Fast Discriminator threshold level (when MANUAL Fdisc Mode is
selected). The range is 0 to 100%.
PUR Guard
Sets the device’s Guard Time (GT) multiplier to reject trailing edge pileup in the event
of detector/preamp anomalies. The PUR guard sets the pileup reject interval, which is
defined by GT x T
Risetime
+T
Flattop
.
LT Trim
Allows adjustment of the trapezoid pulse evolution time or dead time to optimize LTC
performance. The adjustment range is 0 to 1000; the default value of 250 provides
good LTC performance for a wide range of applications.
LTC Mode
Sets the amplifier’s Pulse Pileup Rejector and Live Time Corrector. When PUR is On,
the pileup rejector and live time corrector (LTC) are enabled. Off disables the pileup
rejector and LTC.
Inhibit Mode
Selects inhibit mode. NORMAL instructs the device to gate off while the INHIBIT In
-
put is true. In RESET mode, the inhibit time is automatically extended to account for
the system overload recovery time or while external INHIBIT Input is set true.
Chapter 3 - System Setup
46 Lynx™ Digital Signal Analyzer
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