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:
Max Alpha &
Beta Channel RDA
False Alarm Rate
Detector Parameters
At the current background count rates, these are the highest RDA for any channel
in the PCM-2 with the specified count time and statistical parameters.
This is the percentage of users who will see false alarms given the current set of
parameters.
Detector parameters are normally set via the Override Parameters
screen. Values entered from this screen are written to all detectors;
any entries made previously to a single detector are 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 - Fixed Count Time Mode
~ VOLTAGE (VOLTS), 1600
GEOMETRY FACTOR: 1.00
i"phO Ohooool
I ACTIVE: Yes
I THRESHOLD (% MAX): 45
EFFICIENCY (%): 22.0
I HI
lO FAll (CPS): 100000
FAI l (CPS): 0.00
WEIGHT FACTOR: 50.0
Beta Channel
ACT IVE:
Yes
THRESHOLD (% r'1AX): 5
EFFICIENCY (%): 22.0
HI FAll (CPS): 100000
lO FAll (CPS): 0.00
WEIGHT FACTOR: 10.0
SH IElD FACTOR: 1.00
J
II Calculated Values
IBACKGROUND (CPS):
ALARM lEVEL (NCPS):
RDA lEVEL (DPS):
0.00
1. DO
1. DO
Calculated Values
BACKGROUND (CPS): 0.00
ALARM lEVEL (NCPS): 1. DO
RDA lEVEL (DPS): 1.00
PCM2.MANI REV AI April 1995 5-7