Elma Instruments ELMA 46, Руководство пользователя

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Elma 46 26
v. 170309
6.2 Cable Length Measurement
The tester measures the length of both twisted-pair and coaxial cables. If the tester is not
calibrated to the cable under test, then factory default cable characteristics are used to compute
the length. If a more accurate length measurement is desired, refer to
“CALIBRATING CABLE
LENGTH” described on this manual.
Before a length measurement is made, the tester perfom “Test Cables” described on this manual
to prevent any cable failures from corrupting the length measurement.
Cable length measure procedure.
1. Select cable type under test.
2. Connect the cable and test to the appropriate connector on the tester.
3. Press LENGTH key.
4. Use ▼or ▲key to scroll selection multiple displays.
The information that is displayed depends on the type of cable selected. For twisted pair cable,
each pair has corresponding length measurement. A 5% difference in length between pairs, is
not uncommon.
Example for a 50m UTP cable.
The length of coaxial cable terminated in a resistance cannot be determined by the tester.
6.3 WIRE MAP CHECKING (pin to pin)
Use the tester wire map function and remote identifier unit (ID), to determine the wiring status of
both the near end and far end of the cable.
Wire Map measure procedure.
1. Select cable type under test.
2. Connect the cable under test to the appropriate connector on the tester.
3. Press WIRE MAP key.
Near End →
Good cable with
Far End →
remote unit
Wire Map Failure Using remote unit (ID).
FAILURE DISPLAY WIRING DESCRIPTION
Short (near end)
2
3
2
3
Alternately display an “s” with actual wire
number of each wire shorted.
Open
2
6
3
2
6
3
Alternately display “o” with the number
of each open wire
Miswire
3 3
2 2
Viser ledere med fejl fundet af Elma 46 ,
ledere med fejl blinker.
m
m
m
m