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6.5.1
CONNECTIONS
Connect the red pair test cord to the TriTone Transceiver and the test clips to the pair to
be tested.
6.5.2 TDR MEASUREMENT
•
From the Main screen, press
•
Press [F3] TDR
•
Press [F1] 0-1Kft, [F2] 0-4Kft, or
The TDR screen displays and prompts for a distance range. Select the
shortest range that includes the fault for the best resolution. If the fault
distance is unknown, select the largest range,
The result screen is a graph of the TDR response.
The cursor is a vertical line on the screen and the distance from the
TriTone Transceiver to the position of the cursor is displayed at the
lower left corner of the screen. If the distance is not displayed, press [F1].
Move the cursor to the left or right using the [F2]< and
position the cursor to the beginning of a sharp increase or decrease in
the horizontal line. This is a change in the impedance. A sharp rise is a
higher impedance (open) and a sharp fall is a lower impedance (short).
Other changes in the line indicate other conditions on the line. Refer to
6.5.2.6 below for examples.
The distance to the fault is read with the cursor at the point where the
change just starts to occur.
6.5.2.1
VELOCITY OF PROPAGATION (VOP)
The VOP must be set for the type cable you are testing for the distance readings to
be accurate.
ALWAYS VERIFY THE VOP SETTING. ESTIMATED DISTANCES WILL
BE INCORRECT IF THE VOP IS NOT SET PROPERLY.
•
From the TDR display, press the [CFG] key
•
Press [F1] VOP
•
Use [F2] ▼ and
then press [F1] Set to save the setting.
o
Allied Analogic, Inc.
▲ keys to move the box to the gauge and type cable
[
]
F3
Note: If the cable is not one of the provided options, select the
closest option available but the distance reading will not be
exact. The other option is to use the CUSTOM option and set
the value of VOP for the cable in known.
[
]
F3
METER
[
]
F3
0-8Kft.
12
[
]
F3
0-8KFT.
[
]
F3
> keys to
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