Exfo CableSHARK P3 VF/DSL Cable Qualifier Bedienungsanleitung Seite 122

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VF / DSL Cable Qualifier
110
EDIT /
SELECT
MAIN
MENU
Test Typ e :
Term Impedance :
Termination:
Noise Filter :
Imp Nse Threshold:
Plot Interval:
Meas Time (Hour):
Measurement Units:
100 OHMS
TERMINATED
NO FILTER
43
dBm
1 Minute
1
EF
CHG
IMPULSE HISTOGRAM
WARNING
Note: telephone cables may have dangerous A.C. or D.C.
voltages on them, therefore caution should be taken when
connecting this test set.
!
SELECT
NEXT
-
FIGURE 8.4.1D IMPULSE HISTOGRAM TEST SETUP MENU
The NOISE TEST SETUP Menu has several options that appear at the upper part of the screen (see the
previous illustration). The parameters can be modified to customize a noise test. The noise test setup
options are described as follows:
TEST TYPE:
Select from NOISE PSD Next/Fext 2.2 MHz, NOISE PSD Next/Fext 6.0MHz,
IMPULSE NOISE and IMPULSE HISTOGRAM.
The PSD NOISE test measures the PSD noise energy and displays the result in
terms of dBm/Hz. For this test, no test signal is impressed onto the line under
test. The background cable signal is converted to a RMS voltage reading.
For Impulse Noise, no test signal is impressed onto the line under test. The
background cable signal is analyzed for a predetermined time to count the
number of noise spikes higher than the user selected threshold.
For Impulse Histogram, the CableSHARK plots impulse noise spikes over a user
definable time period.
TERM IMP:
The CableSHARK's impedance needs to match the characteristic impedance of
the cable. This causes the CableSHARK at either end of a test (including Single
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