JDS Uniphase TestifierPRO, Руководство пользователя

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23
Unknown Length Constant
If “length constant” is unknown for a
particular cable, a known length of
the same type of cable may be used
to calibrate the constant. Attach fifty
feet or more of a similar cable from the
same manufacturer to the main unit�
Repeatedly press the mode button
for the type of cable being tested until
Length is displayed� Press up/down
arrow keys until 50ft is displayed� The
length constant displayed is what should
be used to measure the length of the
unknown cable for the same model and
from the same manufacturer� Fifty feet
or more is suggested to minimize the
resolution error; 1 foot in 50 is 2% of
uncertainty�
To Perform Hub Blink
1) Attach the main unit to the network
cable which has the other end
connected to a switch, router, or hub�
2) Press the Network mode button on
the TestifierPRO
f
repeatedly until
Hub Blink is displayed on the screen
and then press the SEL button�
3) The LED corresponding to the
network cable under test should blink
at a rate of 6 seconds per cycle (3
seconds on and 3 seconds off�)
4) To exit Hub Blink mode, press the
Network mode key�