3M™ Advanced Systems Tester 900AST Series
In this case the low impedance anomaly at 24 inches is detected but not classified. The Auto TDR
displays ‘????’ below the trace.
Restoring the Aircraft After Testing/ Troubleshooting
Disconnect the 900AST TDR test cable from the aircraft wiring. Also, remove any adapters (if used). Ensure the other end of the coaxial cable is reconnected. Reinstall the line replaceable unit or component that was removed to accomplish testing or troubleshooting and perform all applicable maintenance manual procedures and operational checks.
Care and Maintenance
Please see the 900AST Series Instruction Manual for care and maintenance information.
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