Appendix A Specifications
142 Lynx II DSA User's Manual - 7096089
TRP INHIBIT MODE
Selects AUTO or MANUAL Reset Preamp Inhibit Modes; disables pulse processing,
extends the system dead time, reinitializes the pileup rejector, and gates off the baseline
restorer. AUTO: System is gated off for the greater of the external RESET signal “OR”
the Internal Inhibit Time. MANUAL: Functionality same as Auto mode except the signal
processor is inhibited for the greater of the user-selected Inhibit Setting “OR” the external
RESET signal “OR” the Internal Inhibit Time.
TRP INHIBIT SETTING
Active when the MANUAL Reset Preamp Inhibit Mode is selected, sets the Inhibit Time,
range 0 to 160 μs in increments of 10 µs.
TRP GATE POLARITY SETTING
Sets the TRP input polarity to POSITIVE or NEGATIVE.
Digital Filter
Note: Filter output (Trapezoid Signal) may be displayed on the Host computer using the
digital oscilloscope feature.
RISE TIME
254 settings for rise and fall times from 0.2 to 51 µs in 0.2 µs increments.
FLAT TOP
33 settings for flat top times from 0 to 3.2 µs in 0.1 µs increments.
PUR GUARD
Selects Guard Time (GT) multiplier of 1.1 to 2.5 in increments of 0.1 to reject trailing
edge pileup in the event of detector/preamp anomalies.
FAST DISC SHAPING
Selects NORMAL or LOW ENERGY 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; LOW ENERGY: The Fast Discriminator filter
rise time is set proportional to the slow shaping rise time selection.
FAST DISC MODE
Sets the Fast Discriminator Threshold mode. AUTO: the threshold is optimized
automatically above the system noise level; MANUAL: allows the threshold to be
adjusted manually.
FAST DISC SETTING
Active when manual FAST DISC MODE is selected; sets the Fast Discriminator threshold
level, the range is 0 to 100%; the rear panel ICR LED serves as a user aid when manually
setting the Fast Discriminator threshold.
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