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Doc. # 5016 BM-185D/285D/286D Rev. A

Operation and Service Manual

5.0 MAINTENANCE

5.1 OPERATOR MAINTENANCE

The hinges and door latch do not require lubrication.

5.2 CALIBRATION

The detectors have been calibrated at the factory and the settings have been stored in the

controller. Because of the stability of the system there should be very little need to perform a

calibration in the field. If background readings are unusually high or low the user may wish to

perform a field calibration by using the following instructions.

Required items: a

137

Cs source with a depreciated value from 1µCi to 10µCi.

If the user does not know the depreciated value of the calibration source but does know when the

source was manufactured, then the user can go to the TSA Systems web site (tsasystems.com)

and look under archives/software/ SourceDepr to determine the depreciated value.

The first thing the user must do is to select the Utilities button from the bottom of the main

screen. This will bring up the utilities menu. The user must then select the Calibrate Electronics

button to bring up the Detector Recognition and Calibration screen. To start the calibration the

user must select the Start Calibration button at the bottom of the screen.

The system controller will then take "roll call" to identify/verify the addresses of the DM-757s. If

the addresses haven't changed since the last time the unit was calibrated, it will continue with the

calibration. If it senses a conflict, the controller will instruct the DM-757 to pick random

addresses and will attempt to resolve the detector electronics. If communications fail after 3

attempts, the controller will tell the user which detector failed and halt operation. If detectors are

resolved successfully, calibration will continue.

After testing/resolving the detectors, the unit will flash the LEFT box associated with the left

detector that is now ready to be calibrated, then the user will be prompted:

Tape the source to the chamber liner wall as close to the middle of the LEFT detector as possible

and click “CONTINUE’ when ready

After the user places the source on the left detector and clicks the “CONTINUE” button the

controller will start the actual calibration.

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Sigma BM-286A Wartungshandbuch Seite 44