20
NOISE FILTER
Use
◄►
to turn ON or OFF the filter. When ON this filter reduces unwanted
noise signature on the cable’s trace.
This menu provides for two ways to select a cable:
1. From a pre-stored Cable List of up to 64 cables.
2. By manually entering a cable’s impedance, velocity and name.
Other features are VELOCITY SRCH. for finding an installed cable’s VF,
SAMPLE A CABLE for finding the VF of a reel or box’s cable using a sample
length, and DISTANCE UNITS for setting feet or meters for the measurements.
PICK/EDIT LIST - PICK
The Cable List contained in the TDR will be either pre-loaded at the factory
depending on model type or can be loaded from one of the Cable Lists stored in
ETDR PC Vision software. The Cable List contains 64 cable types with their
impedance (Z
0
) and velocity factor (VF). Use the
▲▼
arrows to move the bold
highlight to the desired cable type and press
to select, then
to
return to the Measurement Screen.
NOTE: To move up or down the Cable List faster press and hold the
◄►
keys or
to move by a page at a time use the
◄►
.
PICK/EDIT LIST – EDIT
To edit this list select a cable type to replace or an empty cable list slot and press
Bcksp
. Then follow the on-screen instructions to enter new description,
impedance (Z
0
), and Velocity Factor (VF).
NOTE: In the Cable List open slots are indicated in two ways:
OPENnn – These are open slots at the end of a factory list that with nn=
the number of open slots remaining.
OPEN Z=33 VF=33 – These are open slots created by deleting a cable
from the list, then uploading the list to the TDR. Z
0
and VF must contain some
value to avoid list format errors, so 20 is the default set by the ETDR PC Vision.
MANUAL ENTRY
Use for a one time entry not to be saved on the Cable List. Permits entering a
cable’s name or description, impedance (Z
0
) and velocity factor (VF). Use
▼▲
to
select the menu item to change and
►
to select. Make the desired entry using
