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8.2.2 Wire Tracking Function
8.2.2.1 Twisted-Pair Wire Tracking
(1) Connect UT685B tester to the line.
(2) Set UT685B tester to "SCAN" mode, press "POR T" to select RJ45 port. Short press
"
" in tone mode to enable the hub blink function. If the tested cable connects with
the switch under working, "
" will flash synchronously as the indicator light of
switch port flashes.
(3) UT683R Receiver: Adjust the sensitivity with the knob. Making "Beep--Beep--Beep"
sound indicates that the tested cable is found out.
8.2.2.2 Coaxial Cable Tracking
(1) Connect UT685B tester to the line.
(2) Set UT685B tester to "SCAN" mode, press "PORT" to select coaxial cable port.
(3) UT683R Receiver: Adjust the sensitivity with the knob. Making "Beep--Beep--Beep"
sound indicates that the tested cable is found out.
8.2.2.3 Wire Tracking Diagram
If the targeted cable is among a large amount of other cables, please adjust the sensitivity
with the knob. High sound volume indicates that the received signal is strong and the
targeted cable is close.
Cable locating
Wall-mounted outlet
(RJ11/RJ45 jack)
Figure 8.2 Wire Tracking Diagram
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UT685B/UT685B KIT
Cables separating
Volume
control
UT685B/UT685B KIT
8.2.2.4 Other Functions
(1) NCV function: Press "NCV" to enable NCV function. If the voltage of targeted cable or
receptacle is greater than 40V (AC), the receiver makes beep sound and the NCV
indicator light flashes synchronously.
(2) Flashlight: Press the flashlight button to enable the flashlight function separately.
(3) Low battery indication: If the battery voltage is lower than 3.4V, the power button flashes;
if lower than 3.0V, the receiver powers off.
(4) Earphone: When performing test in noisy environment, please minimize the sensitivity,
and then wear earphone to adjust the sensitivity for appropriate sound volume.
Interference can be avoided by wearing earphones. Note that earphones are not
supplied.
IX. Calibrating Length Measurements (Only for test
mode)
9.1 Setting the NVP to a Specified Value
As shown in figure 9.1, set NVP as a specified value:
(1) Hold down "
", "
" and "
" at the same time to enter NVP setting mode.
(2) To set the NVP for coaxial port, please press "PORT".
(3) Use "
" and "
" to set the NVP value.
(4) To save the setting and exit NVP mode, turn the tester off then on again.
The tester calculates cable length through the use of NVP and signal delay. The default
NVP is accurate enough to verify length, but in actual measurement, the length measurement
accuracy can be improved by adjusting the NVP to specified or actual value.
Note: NVP refers to Nominal Velocity of Propagation. 69% mainly refers to the proportion
of propagation velocity of electron through cable to velocity of light, i.e., the velocity of light
is about 0.3m/ns, and the propagation velocity of electron through cable is 0.2m/ns, then,
NVP is the proportion of these two velocities (
cable test by manufacturer. NVP varies depending on different cables, but the NVP of
unshielded twisted pair (UTP) is 69% typically , except for special settings, which need to
be set by DSP. NVP is the key value to calculate length.
Figure 9.1 NVP Value Setting Interface
), which is calculated in
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