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Press the
ESCAPE
key to exit.
Editing the Cable Type
To display the
EDIT CABLE
screen, press
Cable (F1)
from the
Ready
screen, then press
Edit
(F2).
This screen displays the characteristics of the cable you will be testing.
Press the
Ñ
or
Ò
arrow key to highlight the (cable) Name or NVP (Nominal Velocity of
Propagation) field. The Impedance field is for reference only and does not affect test results. The
highlighted field will be enclosed in a box. Use the Scanner keypad to enter the Cable Name or the
NVP value.
Press
Del (F2)
to delete the character at the cursor.
If your Scanner has an alphanumeric overlay on the keypad, use the keypad to enter the cable
name. If your Scanner does not have an alphanumeric overlay, press
Edit (F2)
to edit the name. See
Chapter 4: Editing, Printing & Updating
for more information on editing.
Note: If you change the information for a factory supplied cable type and do not edit the cable
name, an asterisk (*) will appear before the cable name.
If you are not sure of the NVP value, press
GetNVP (F4)
to calculate it. See Calculating NVP for
more information.
Press
Save (F1)
to store the new settings and exit. If you have changed the cable information,
press
Default (F1)
from the
CABLE SETUP
screen to select it as the cable type to use during
testing.
Press the
ESCAPE
key to exit without saving.
Calculating NVP
To display the
CABLE NVP
screen, press
Cable (F1)
from the
Ready
screen, then press
Edit
(F2);
then press
GetNVP (F4).
For an accurate Length test, the NVP (Nominal Velocity of Propagation) must be set correctly.
NVP is a measure of how fast a signal travels down a cable compared to the speed of light. It is
usually between 60% and 90% and is specified by the cable vendor. The Scanner has a large library
of cables with the manufacturer’s specified NVP.
This screen lets you calculate the NVP for cables over 50 feet (15.24 meters) long. The
PentaScanner
and
PentaScanner Cable Admin
calculate the NVP based on the longest wire
pair in the cable. The
Penta
calculates the NVP based on the shortest wire pair in the
cable.
You can use the
CABLE NVP
feature to create a custom cable type when the cable type is not
known.
If your Scanner has an alphanumeric overlay on the keypad, use the keypad to enter the cable
length. If your Scanner does not have an alphanumeric overlay, press
Edit (F2)
to edit the length.
See Chapter 4: Editing, Printing & Updating for more information on editing.
Press
Del (F2)
if you wish to delete the character at the cursor. After you have entered the cable
length, press
Calc (F4)
to calculate the NVP.
