Programmable Controls
Lynx II DSA User's Manual – 7096089 141
Programmable Controls
Gain
The combination of Coarse Gain and Fine Gain set the overall system gain to match the
requirements of the detector and energy range for the application; overall gain is
continuously adjustable from x1.6 to x516.3 based on a 2 V full scale. Upper gain
adjustment is comparable to an x2581.5 setting on a traditional analog amplifier with 10 V
full scale.
COARSE GAIN
Range is x2 to x430 in 19% increments.
FINE GAIN
Range is x0.8 to x1.2 in approximately 0.001% increments.
GAIN ATTENUATOR
ON/OFF; When ON (selected) enables a divide by four input attenuator to minimize
overload due to preamp signals with large dc offsets and Reset Preamps with large output
ramp dynamic range. When OFF is selected the signal attenuation is removed.
CONVERSION GAIN
Selections of 256, 512, 1024, 2048, 4096, 8192, 16384, or 32768 channels define the size
of the spectrum and resolution of the digitized PHA signal. Support for two memory
groups of equal in size to the Conversion Gain setting. Conversion gain is set
automatically through the Input Size setting. The Input Size also determines the size of the
PHA spectrum in channels.
LLD MODE
Selects Automatic or Manual Lower Level Discriminator (LLD) mode; AUTOMATIC:
the LLD cutoff is automatically set just above the spectral noise threshold; MANUAL:
allows the LLD cutoff to be set manually as a percentage of the full scale spectral size or
range.
LLD SETTING
Active when the Manual LLD mode is selected, set the minimum input acceptance level,
range is 0 to 100%.
ULD SETTING
Sets the maximum input acceptance level for the Upper Level Discriminator (ULD), range
is 0 to 110%.
INPUT POLARITY
Selects either POSITIVE or NEGATIVE input polarity.
To Next Page
Loading...
Need help?
General
