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3M
™
Advanced Systems Tester 900AST Series
5
Use the [RFL] key to find the distance to a
resistance fault between two conductors or a
conductor and ground.
This key is used for editing only.
Use the [TDR] key to activate the Time
Domain Reflectometer.
Use the [Auto] key to activate automatic
TDR trace analysis.
CAUTION
The 900AST tester is a tool for troubleshooting wiring
problems. It is not designed for troubleshooting electronic
circuits or instrumentation. The ohms, soak, contact
resistance, special resistance and RFL functions
generate a current limited (< 1 mA) 80V stimulus.
TDR and Auto TDR functions generate high-energy
electromagnetic pulses. Unexpected measurement
results and/or damage are possible if applied to
electronic circuits.
Circuit testing should be performed by personnel trained
in electrical safety practices and in accordance with
applicable safety standards.
Connecting to Coaxial Wires for Testing
Ensure that electrical power has been removed and
components disconnected from the wiring to be
tested before beginning wiring tests.
Note: For best operation, use the special coaxial
TDR test leads supplied with your 900AST
tester to perform coaxial wire TDR
measurements.
The TDR test cable has a standard male BNC
connector on the end. Plug the opposite end of the
TDR test leads plug into the Red/Black and/or Blue/
Yellow test jacks on the 900AST tester (one or more
cables may be used depending on the desired TDR
mode.)
Connect the end of the TDR test cable to the coaxial
wire to be tested. Use a BNC adapter (if needed) to
connect to the coaxial circuit under test.