Rapiscan TSA TPM-903B Operation And Service Manual - 5.0 Maintenance
TSA TPM903 Operations and Service Manual
Doc: # 5058 Rev. A
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5.0 MAINTENANCE
Once initial installation has been completed, little maintenance is required. Periodic inspection is
recommended to insure proper functioning. This should include (but is not limited to):
-visual inspection for loose wires, etc.
-field calibration
-checking the settings of the control module
-running a variance test
-performing a walk-through test
A Performance Verification Checklist is included at the end of this section. It is recommended
that a copy of this be filled out whenever the TPM-903B is put into service after tuning and
recalibration.
5.1. TPM Controller
The display contrast may change slightly with outside temperature variations. If the display is
difficult to read, adjust the “R1” potentiometer on the SC-771 board. Refer to Drawings 6 and 10
for component locations.
5.2. VARIANCE ANALYZER MODE
After calibration is complete, a variance test should be performed. The variance analyzer will
identify many problems such as noise or light leaks with both the detectors and associated
electronics. Be sure to restrict all movement in the area while performing a variance test.
In the TPM-903B system after five updates all variance readings should be less than 0.10. Refer
to the Appendix for further detail on the variance test and the formulas used. Press the pound (#)
key to terminate the variance test.
5.3. WALK THROUGH TEST
Due to the many different environments and materials being monitored, the walk through test
will vary from site to site, although several general principles apply in all cases. Select an
appropriate source, and instruct the test subject to walk at the normal speed for testing personnel,
carrying the source alternately at belt level, at head level (under a hat), and at shoe or ankle level.
Repeat the test several times and record the sources and sizes used.