Checking The Wire Map - Fluke 620 User Manual

620
Users Manual
Length of a coaxial cable terminated in a resistance
cannot be determined by the test tool. Only the total
resistance of the wire and termination is displayed. An
unterminated coaxial cable 445 feet long will display the
following:

Checking the Wire Map

Using the test tool's Wire Map function and a Cable ID
Unit, you can determine the wiring of both the near and
far end of the cable. To test the Wire Map, perform the
following:
1. Connect the cable under test to the appropriate
connector on the test tool.
2. Turn the rotary switch to WIRE MAP.
3. This step can be omitted if you know the cable
selection is correct for the cable under test. Press
to check the cable selection. The test tool
displays the cable selection for a few seconds and
then starts the test. "CAL" appears in the second line
16
of the display if a cable calibration has been
performed for the selected cable type. If the test tool
is not set up for the cable under test, refere to
"Preparing the Test Tool for Use" to select a new
cable setting.
If you select the COAX wire type while in the
WIRE MAP mode, the test tool will perform the
LENGTH function on the cable.
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Assuming the cable attached to the test tool is a EIA/TIA
4 pair cable with no failures, the following display
indicates a good cable:
Near End
Far End
The top line always displays the near end of the cable;
the second line always displays the far end.
When the test tool detects a Cable ID Unit but cannot
determine the ID number, #? Is displayed for the ID
number. The test tool will alternately display a ? and a
Note
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