Spectrum
With the Spectrum analysis, it is possible to
examine the spectral noise across the DSL
frequency range.
Measurement method
Select the operating mode
Spectrum
and
press
SEL
.
In the following screen, the Start Frequency,
End Frequency, Impedance and whether
the Termination ”On” or ”Off” is set. Pressing
the 1 key of the numeric keypad or
SEL
starts the measurement process.
Under F1 More, the waveform between
Peak (maximum), Mean (Average
measurement) and Normal (Peak + Mean)
can be switched. Min, the lower value and
with Max the upper value of the graphic are
predefined.
Measurement result
The measurement results are available
both graphically and numerically and are
displayed simultaneously. Given the
frequency in Hz and the level in dBm or dBm
/ Hz, whichever was selected from F2
Unit
.
Wideband Noise
The transmitted signal of the subscriber lines is disturbed by
noise which reduces the data transmission capacity.
Contributors to noise include balance faults, crosstalk and
poor connections to the switched telephone lines. The noise
level is shown as single value in dBm.
Measurement method
Select the mode
Wideband Noise
and press
SEL
. The signal
can be transmitted with different impedance values, these
can be selected with F2 Impedance. With F3 Filter the
different DSL filters are adjustable.
Measurement results
The measurement result is displayed numerically in dBm.
Date / Time
Spectrum
Frequency
240,6 kHz
a/b: 0,0 V
0
-115
25,00 kHz
Level
-107,20 dBm
dBm
8,33 kHz
11,7 kHz
15,0 kHz
Help
Date / Time
Spectrum
a/b: 0,0 V
Start...
1
Start Frequency
End Frequency
Impedance
Termination
3
4
5
6
<ADSL2+>
<Off>
<250 kHz>
<2,5 MHz>
Operating Manual
KE3500
xDSL
M
ULTI
T
EST
Date / Time
Wideband Noise
a/b: 0,0 V
-82,01 dBm
ADSL
Filter
32
KURTH ELECTRONIC Test & Measurement www.kurthelectronic.de [email protected]
Band
2
<100
W
>
More
More
auto
Min
auto
Max
dBm
Unit
dBm
dBm/Hz
ADSL
ADSL+
VDSL1
VDSL2-8
VDSL2-12
VDSL2-17
VDSL2-30
100
W
Impedan.
Hz
Help
Normal
Peak
Average
100
W
120
W
ADSL ... VDSL2 30a,
Manual entry
Input
Input
<100
W
>, <120
W
>
<Off>, <On>
