Rapiscan TSA TPM-903B Operation And Service Manual - page 14
TSA TPM903 Operations and Service Manual
Doc: # 5058 Rev. A
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3.4.1. PARAMETERS
To access PARAMETERS you will first have to press “0” followed by the password. The next
screen gives you two options, 1. GAMMA and 2. COMM SET. Press 1 on the keypad. The next
screen that comes up will give you 1. PARAMETERS and 2. FUNCTIONS. Press 1 to give you
the following options:
1. HI/LO LEVELS: Background alarm levels
2. OCCUP HOLDIN: Number of 200ms intervals to hold in after occupancy
3. NSIGMA: N*sigma radiation alarm level
4. SET CLOCK: Time and date
5. BKG TIME: Number and position of detectors in the system
6. SHOW VERSION: Displays the firmware version
7. KEYPAD RESET: Changes from auto reset to manual reset
8. ADJ. DISCRIM Discriminator adjustment
3.4.1.1. HI/LO LEVELS: Sets the low and high background alarm levels, in CPS per detector. If
the counts fall outside this window, the system will indicate a background fault, and not allow
further operation until the problem is corrected. These levels should be set to alarm if the average
background deviates too far from normal. These alarms are intended to flag a failure in the
detector or electronics. The precise settings will vary with local conditions and requirements, but
a good starting point is usually 50% of the average background (per detector) for the low and
150% of the average background (per detector) for the high.
3.4.1.2. OCCUP HOLDIN
Number of 200ms intervals to hold in after the occupancy signal indicates the system is vacant.
This prevents the person from attenuating the background. The factory setting is 5 intervals
(1,000 milliseconds), but the optimum setting may vary with local conditions.
3.4.1.3. NSIGMA
Sets N*sigma radiation alarm level. Where N is the number entered and sigma = 1 background in
CPS. This formula determines the number of counts, above background, that will trigger a
radiation alarm.
3.4.1.4. SET CLOCK
Sets the system time and date. The operator will be prompted to enter the hours (in 24-hour
format), minutes, month, date, and year (last two digits only) from the keypad. When the pound
(#) key is pressed after the last entry, the data are written to the internal clock/calendar.