Kurth Electronic 0.49810, Operating Manual

Page: 35 / 46

Hilfe
Date / Time
TDR
a/b: 0,0 V
START ... 1
Hide Dead Range
Send On Port
Impulse Length autom.
2
3
4
<1>
<Off>
<Off>
Hilfe
Date / Time
TDR
a/b: 0,0 V
0,0 326 m 1291
12.5 ns
Pulse
0 dB
Gain
x 4
Y-Zoom
Y(ST)Y_4x2x06
12.5 ns
25 ns
50 ns
100 ns
250 ns
500 ns
1000 ns
2500 ns
0 dB
10 dB
20 dB
30 dB
40 dB
50 dB
56 dB
x 1
x 2
x 3
x 4
x 5
x 6
x 7
x 8
x 9
x 10
Operating Manual KE3500 xDSL M
ULTI
T
EST
TDR (optional)
TDR (Time Domain Reflectometer) mode works
on the pulse-echo method. A measuring pulse is
transmitted through the cable. When the pulse
reaches the end of the cable, or a fault of the cable,
a certain part of the pulse energy is reflected back
to the meter.
It measures the time required for the return of the
pulse along the cable, and shows disturbances in
the reflection. From that time, the distance is
determined and displayed as a reflection curve.
The shown reflection curve displays all changes in
impedance along the cable. The amplitude of a
reflection is determined by the size of the
impedance change.
Finds cable faults such as short circuit, opens,
bridge taps, bad splices, water penetration and
other damage such as lightning strikes, crushed
cable etc. which changes the impedance of the
cable. The maximum cable length for testing
telecommunication cables in this case is up to
50,000 feet, depending on the gauge.
Measurement method
Select the mode TDR and press SEL . In the
following screen you can make settings and set
the measuring port. Pressing the 1 key of the
numeric keypad or
SEL starts the measurement
process.The distance to the fault is displayed on
the screen when the cursor is set to the beginning
of the fault location reflected pulse. Under F2
Pulse, the duration of the probe pulse are set in ns.
With Gain under F3, the pulse energy can be
increased. Under F4 Y-Zoom, the illustrated
reflection curve can be magnified up to 10 times.
When transmitting on L1 and measured on L2,
opens, ground fault, etc. can be accurately located
(crosstalk).
Press the ◄ / ► buttons to move the yellow
pointer and to detect the exact distance to the
cable fault.
35
KURTH ELECTRONIC Test & Measurement www.kurthelectronic.de info@kurthelectronic.de
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