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3M
™
Advanced Systems Tester 900AST Series
15
To change the coaxial configuration go to the TDR
function and press the Setup key.
Use the
and keys and the Blue numeric
keys to enter the length of cable to analyze. Enter a
length longer than the cable being tested but as close
as possible to the total length of the cable.
When the correct information is displayed on the
Auto TDR screen, press the
key to start the
analysis. The 900AST performs tests to determine
if the cable is shorted, open circuited, or has a
resistance fault.
Note: Auto TDR operates from a captured trace.
The trace is not ‘live’ as in the standard TDR
mode.
Auto TDR Resistive Faults
Note: Resistance faults are very difficult to detect
using TDR techniques. If a resistance fault
is detected, the 900AST tester prompts you
to consider using the RFL (Resistance Fault
Locate) function as shown below.
Auto TDR Trace Analysis
If the Auto TDR detects an open circuit, the cursor
is positioned at the location of the open circuit and
OPEN is displayed below the trace. If the Auto
TDR detects a short circuit or low resistance fault,
the cursor is positioned at the location of the short
circuit and SHORT is displayed below the trace.