Name: 0-8km visual Cable Fault Locator Power Meter This Cable
Fault Locator (hereafter referred as locator) can measure the exact
fault location such as the broken line, cross faults, earthing,
poor insulation and poor contact of the lead covered cables as well
as plastic cables.The highlights for this locator are that it can
test numbers of typical faults, features are as follow:Digital gain
Adjustment control to make the gain adjustment very easy.Digital
waveform automatically Identify technique to make sure no test dead
zone.Top grade ARM single chip micro computer can make calculation
and judge the fault waveform exactly.Large colorful LCD display;
humanized operation interface; six function keys can do all the
tests.High-energy Li battery, continuous work 10 hours (with
special charger). SPECIFICATIONS Max range: 8 km
(16km/32km are optional)Highest resolution: 1mDead Zone: 0 mPower
consumption: 1WWeight(kg): 0.38kgDimension(mm):
204×100×36mm3Working temperature: -15ºC to + 45ºCStorage
temperature: -20ºC~ + 55ºC USB storage (optional): transmit
wave form to U disk, and analyze the wave form on computer
WORKING PRINCIPLEPulse testing is a kind of remote testing method;
one can locate the fault point without testing on the field or
testing with end-to-end coordination. The principle of the theory
is:The instrument emits a pulse to the line, when the line has
faults, the pulse reflection will change. If the come and back time
can be measured, the location of the fault point can be
detected.Suppose the pulse transmission velocity in electric cable
velocity is V, the come and back time that the pulse travels
between the test point and the fault point is T, the fault distance
is L, then: 2L = V T L = V T/2For example, the sending
end transmits a pulse to the cable, after 20μs, the sending end get
the reflection pulse. If the pulse transmission velocity in the
electric cable is 201m/μs, the fault distance L isL = 201×20/2 =
2010m TESTING PROCEDURESDiagnosis of fault charactersTo
insure the accuracy of the testing of fault point, the testing
personnel shall diagnose the fault characters correctly and then
choose the most suitable testing mode. The characters of telecom
cable faults can be simply divided into the following several
kinds: Broken line One or many cable core line are
broken. Crossed lineThe insulating resistance between the
different couple of lines drops and causes the communication
amplitude drops. Earthing faultThe insulating resistance
between the core line to the lead cover drops and causes low
communication qualityCrosstalk noiseWhen the cable core insulation
material is invaded by water or humidity, the insulating resistance
will drop and cause low communication quality or even blocks.Bad
insulationThe insulating resistance between different couple of
lines and the core drops to a very low level, the communication
quality comes under serious influences.Fault TestingCut off the
cable to be tested both sides lines or equipment. Make sure the
cable to be tested is free of voltage. Using this instrument to do
intelligence testing first, if the fault cannot be detected and
then you can change to manual testing.Locating fault pointThe
tester will Judge the approximate location based on the testing
result, then check the cable, cable gland, cross boxes, etc.,
depending on the actual situation.AUTO TESTPress, connect the
testing lead line and fault cable line. Press and then the
instrument will show the testing result.Note: The default setting
wave velocity is 200m/ μ s, when you perform
intelligence testing, the user shall check whether need to
adjust the velocity.MANUAL TESTThe relevant setting and parameters
will demonstrate on the underneath of the display screen. Press
to adjust the setting and parameters.1) GainPress ,
until "Gain" shows reverse color display. Then press
orto adjust the amplitude (1~99 adjustable),
Press , the screen will display the waveafter gain
adjustment. 2) RangeDuring manual testing, range decides the
maximum testing distance of the instrument, so the range value
shall be chose as longer than actual length of the cable tobe
tested. To adjust the Range, press , until
Range shows reverse color display.Press or to
adjust the Range.3) VOPThe precision of the wave velocity, directly
affect the precision of the testing result. So the wave velocity
shall be calibrated according to the cable characters. Press ,until
VOP shows reverse color display. Then, press or to
adjust the wave velocity.Adjust the Range and
VOP according to the characters and estimated length of the
cable to be tested. Appropriately adjust the wave amplitude to make
the waveforms on the display screen to be observed easily. Move the
cursor to inflection of the reflected waveform. The fault distance
will demonstrate on the underneath of the display screen.4)
Waveform ComparisonPress until it displays "Press "-" to
memory, "+" to both". Now press "" tosave the current waveform;
press
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