Acquisition Modes and Acquisition Units
Lynx DSA User's Manual - 9240227J
5
Acquisition Modes and Acquisition Units
The Lynx supports several acquisition modes:
PHA Mode
The PHA (Pulse Height Analysis) mode acquires energy-correlated data. Each
channel, defined as an energy window, is incremented by one count for each
event that falls within the window, producing a spectrum which correlates the
number of energy events as a function of their amplitude. The energy resolution
of the spectrum (number of channels) is determined by the Input Size setting. Its
range is from 256 to 32678 channels.
Input #1 must be set for PHA mode. Acquisition can be directed into either of
two memory groups. The memory groups are identical in size. Each group can
store the spectrum data and the acquisition times independent of the other group.
Spectrum data and acquisition times are stored in persistent memory, meaning
that cycling power to the Lynx will stop any acquisition in progress but will not
lose data already accumulated.
Spectrum data is cleared by the Lynx when changing acquisition modes for Input
#1.
DLFC Mode
The DLFC (Dual Loss Free Counting) mode of operation allows real-time
acquisition of events, and will produce two PHA-type spectra. One spectrum
contains live time corrected counts, and the other produces the normal
uncorrected counts. Each spectrum may be viewed from the web display via the
memory groups. Memory group 1 displays the corrected spectrum. Memory
group 2 displays the uncorrected spectrum.
Input #1 must be set for DLFC mode. Acquisition is automatically directed into
both memory groups. The memory groups are identical in size. Acquisition times
for both groups are identically when in DLFC mode.
MCS Preset Mode
The MCS (Multichannel Scaling) mode acquires time-correlated data. Each
channel is sequentially allocated a dwell time (a specified time period) for
accumulating counts until all the memory has been addressed.
Input #2 must be set for MCS mode. Acquisition can be directed into either of
two memory groups. The memory groups are identical in size. Each group can
store the spectrum data and the elapsed sweeps independent of the other group
MCS and PHA acquisitions are independent of each other. Spectrum data and
elapsed dwell values are stored in persistent memory, meaning that cycling
power to the Lynx will abort any acquisition in progress but will not lose data
already accumulated.
