PCM-2 Manual.pdf - Voss Associates

Alpha & Beta
Sum Zone Alarm
Alpha & Beta
Sum Channel Alarm
A sum zone is a user defined group of two to four detectors which are grouped
together to enhance the monitor's ability to detect contamination spread over an
area shared by several adjacent detectors. The alpha or beta sum zone alarm
setpoint defines the activity required within the sum zone area before a sum zone
alarm is triggered. Refer to the upcoming section or sum zone setup for more
information on sum zones.
A sum channel is a sum zone consisting of every channel in the monitor. The
alpha or beta sum channel alarm setpoint is the activity which must be present
within the entire monitor before the sum channel alarm is triggered.
Whenever the above parameters are changed, the following dependent values are
recalculated and displayed:
Count Time
False Alarm Rate
The measurement count time required at present background rates. This is the
longest count time calculated for any detector channel.
This is the percentage of users who will see false alarms given the current set of
parameters.
Detector Parameters
Detector parameters are normally set via the Override Parameters
screen. Values entered from this screen will be written to all
detectors; any entries made previously to a single detector will be lost.
Parameters for a single channel may be 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 - Min Count Time Mode
HIGH VOLTAGE (VOLTS):
GEOMETRY FACTOR:
1600
1.00
io=Alpha Channel
ACTIVE:
THRESHOLD (% MAX):
EFFICIENCY (%):
RDA (DPS):
HI FAIl. (CPS):
LO FAIL (CPS):
WEIGHT FACTOR:
Calculated Values
BACKGROUND (CPS):
ALARM LEVEL (NCPS):
COUNT TIME (SEC):
Yes
45
22.0
16.7
100000
0.00
50.0
0.00
1.00
1. 00
Beta Channel~~c~~~~~~=91
ACTIVE:
Yes
THRESHOLD (% MAX): 5
EFFICIENCY (%): 22.0
RDA (DPS): 83.3
HI FAIL (CPS): 100000
LO FAIL (CPS): 0.00
WEIGHT FACTOR: 10.0
SHIELD FACTOR: 1.00
calculated Values
BACKGROUND (CPS): 0.00
ALARM LEVEL (NCPS): 1.00
COUNT TIME (SEC): 1.00
PCM2.MANI REV AI April 1995 ~-11