DTX Series CableAnalyzer
Technical Reference Handbook
5-6
About Setting the Reference
The reference serves as the baseline power level for loss
measurements. Regular referencing helps account for
minor variations in source power and connection
integrity. Also, since the reference is the baseline for
measurements, the losses of the patch cords and adapters
used during referencing are excluded from test results.
Note
Turn on the tester and smart remote and let
them sit for 5 minutes before setting the
reference. Allow additional time if the modules
have been stored above or below room
temperature.
You should set the reference at these times:
• At the beginning of each day using the remote end
setup (Figures 5-8 through 5-16) you will use that
day.
• Anytime you reconnect a patch cord to the module’s
output or other source.
• Anytime the tester warns you that the reference is
out of date.
• Anytime you see a negative loss measurement. (See
Chapter 7.)
You must set the reference at these times:
• Anytime you change the fiber module in the tester
or smart remote.
• Anytime you start using a different smart remote.
• Anytime you change the Test Method in Setup.
• Twenty-four hours after the reference was
previously set.
Reference values should not change by more than a few
tenths of a dB from day to day. Larger changes may
indicate a problem with the patch cords or connections.
See the sections on Smart Remote, Loopback, and Far
End Source modes for details on setting the reference for
each mode.
After you set the reference, you can enter the lengths of
the patch cords used for reference and test connections.
The lengths are included with saved results to meet
TSB-140 reporting requirements for fiber test results.
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