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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
or the Data button
C
The length constant will be displayed with the word 'EDIT'. Use the UP
and DOWN
buttons to increase or decrease the Length Constant value
C
in units of 0.1 pF/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 measurement 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 a 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 Pins 3 and 4 of a voice cable.
If you wish to set the Cable Length constant on Wire pairs other than pins 3 and 4 of a 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 the best accuracy, the sample
cable should be 50 ft or longer. This example will use 50 ft.
1. Acquire a known length of cable at least 50 ft in length (50 ft in
this example) of the same type that you would like to measure.
2. Press the Power button
3. Follow the procedure in the MEASURING LENGTH section(s) to
set up the correct type of cable.
4. Press the Settings button
5. Use the Up
A
and Down
the Length Constant, in units of 0.1 pF. Continue to adjust the
Length Constant until the Length Measurement displays the
correct known length measured earlier.
You may now measure other unknown lengths of cable using this
measured length constant.
CHANGING THE UNIT OF MEASUREMENT:
1. Press the Power button
2. Press the Settings button
3. Use the Up
A
and Down
NOTE: Feet unit readings have no decimal place and are displayed as '0 ft'. Metre unit readings have one
decimal place and are displayed as '0.0 m'.
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 end point to end point. These errors are called split pairs and can be present in
cables that aren't miswired.
OPERATING INSTRUCTIONS
Pro 3 stores a separate length constant for each of the three cable types (voice,
TM
G
to turn the tester on.
.
E
.
. Press the Data button
F
again, and you will be editing the wire pair you just selected.
E
. Press the Voice button
F
again, and you will be editing the wire pair you just selected.
E
to turn tester on.
G
to enter Edit mode.
E
C
buttons to increase or decrease
G
to turn tester on.
twice; 'ft' or 'm' will be displayed.
E
C
buttons to change between feet (ft) and metres (m).
, the Coax button
A
B
A
repeatedly until the pair you wish to edit is
C
repeatedly until the pair you wish to
A
154 = 15.4 pF/ft
Remote ID No.
(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)
Cable
Type
5
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