PCM-2 Manual.pdf - Voss Associates

v./henever the above parameters are changed, the following dependent values are
recalculated and displayed:
Alpha & Beta
RDA Lower Limits
False Alarm Rate
Min Count Time
At the current background count rates, these are the lowest RDA values which are
attainable using the specified count time and statistical parameters.
This is the percentage of users who will see false alarms given the current set of
parameters.
The shortest count time which can be used to detect the specified RDA at the
present background levels.
Detector Parameters
Detector parameters are normally set via the Override Parameters screen. Values
entered from that screen are written to all detectors; any entries made previously
to a single detector are lost. Parameters for a single channel are examined or
adjusted through the Detector Parameters screen by using the arrow keys to select
the desired detector. Detailed explanations of these parameters and their uses are
provided elsewhere in this manual.
Detector #0 Parameters - Preset All Mode
IHIGH VOLTAGE (VOLTS): 1600
LGEOMETRY FACTOR: 1.00
poAlpha Channel~=~~~=~~~~Beta
Channel~=======-il
ACTIVE: Yes ACTIVE: Yes
THRESHOLD (% MAX): 45 THRESHOLD (% MAX): 5
EFFICIENCY (%): 22.0 EFFICIENCY (%): 22.0
RDA (DPS): 16.7 RDA (DPS): 83.3
HI FAll (CPS): 100000 HI FAIL (CPS): 100000
LO FAIL (CPS): 0.00 LO FAIL (CPS): 0.00
WEIGHT FACTOR: 50.0 WEIGHT FACTOR: 10.0
SH IELD FACTOR: 1.00
Calculated Values
Calculated Values
BACKGROUND (CPS): 0.00 BACKGROUND (CPS): 0.00
ALARM LEVEL (NCPS): 1.00 ALARM LEVEL (NCPS): 1.00
RDA LOWER LIMIT (DPS): 1.00 RDA LOWER LIMIT (DPS): 1.00
L:0UNT TIME (SEC): 1.00 COUNT TIME (SEC): 1.00
High Voltage
The detector voltage may be adjusted in steps of approximately ten volts not to
exceed 1750 volts.
PCM2.MANI REV AI April 1995 5-3