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DISPLAYING/EDITING LENGTH CONSTANT:
Follow these instructions to set the length constant based on a known value (for example, as given by the cable
manufacturer). The VDV Scout
data, and video).
1. Press the Power button
2. Press the Settings button
3. Select the cable type by pressing the Voice button
The length constant will be displayed with the word "EDIT". Use the UP
and DOWN
in units of 0.1pF/ft. to the desired value. The decimal is not displayed, so for
example, "154" on the display means that the Length Constant is 15.4 pF/ft.
Length Constants are displayed in pF/ft. or pF/m, depending on the selected
unit of measure mode.
NOTE: The Length Constant can only be edited in the pF/ft. mode. It is not editable in the pF/m mode.
NOTE: The Default for Length Constant edit for the Data cable is the wire pair of pins 1 and 2. If you wish to
set the Cable Length constant on Wire pairs other than pins 1 and 2 of data/RJ45 cable, follow steps 1 through
3 above. Press the length button
displayed. Press the Edit button
NOTE: The Default for Length Constant edit for the Voice cable is the wire pair of 3 and 4 of voice cable. If
you wish to set the Cable Length constant on Wire pairs other than pins 3 and 4 of voice cable, follow steps 1
through 3 above. Press the length button
edit is displayed. Press the Edit button
DETERMINING AN UNKNOWN LENGTH CONSTANT:
Follow these instructions to set the Length Constant based on a
sample cable of known length. For best accuracy, the sample cable
should be 50 ft. or greater. This example will use 50 ft.
1. Acquire a known length of cable at least 50 ft. in length (50 ft. in
2. Press the Power button
3. Follow the procedure in MEASURING LENGTH section(s) to set
4. Press the Settings button
5. Use the Up
You may now measure other unknown lengths of cable using this
measured length constant.
CHANGING UNIT OF MEASUREMENT:
1. Press the Power button
2. Press the Settings button
3. Use the Up
NOTE: Feet and meter unit readings display no decimal place and will read as "0 Ft" and "0 m", respectively
TESTING CONTINUITY:
Faults: When testing for continuity of a cable, you are checking that all conductors within a cable are connected
properly from one end to the other. Usually, faults occur when terminations on each side are not connected
(an "open"), or when adjacent conductors are accidently connected (a "short").
Miswires/split pairs: 8-wire data cables can have an additional set of errors. A miswire simply means that
the pin on one side of the cable is not connected to the identical pin on the other side of the cable (for example,
pin 2 on one side is connected to pin 6 on the other side). Certain pairs of conductors are required to be twisted
together from endpoint to endpoint. These errors are called split pairs, and can be present in cables that don't
have any miswires.
1.800.561.8187
Pro 3 stores a separate length constant for each of the three cable types (voice,
TM
to turn tester on.
G
.
E
or the Data button
C
.
C
buttons to increase or decrease the Length Constant value
F
. Press the Data button
again, and you will be editing the wire pair you just selected.
E
this example) of the same type that you would like to measure.
to turn tester on.
G
up the correct type of cable.
E
to enter Edit mode.
A
and Down
C
buttons to increase or decrease the
Length Constant, in units of 0.1pF. Continue to adjust the Length
Constant until the Length Measurement displays the correct
known length measured earlier.
G
to turn tester on.
E
twice; "ft" or "m" will be displayed.
A
and Down
C
buttons to change between feet (ft) and meters (m).
www.
OPERATING INSTRUCTIONS
A
, the Coax button
A
C
repeatedly until the pair you wish to edit is
. Press the Voice button
repeatedly until the pair you wish to
F
A
E
again, and you will be editing the wire pair you just selected.
.com
Cable
Type
B
154 = 15.4pF/ft.
Remote ID#
(if terminated)
Adjust the
Length Constant
up or down until the
Length Measurement
displays as the
known length of the
sample cable(50 ft.
in this example)
information@itm.com
5
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