DMU-2000 D
ATA
M
ANAGEMENT
U
NIT
Page 24
U
SING
THE
LBWS
(
L
IMITED
B
AND
W
IDTH
S
WEEP
)
F
UNCTION
LBWS (Limited Band Width Sweep) is a function that sweeps a limited
segment
of the Spectrum Scope span without
changing
the span (bandwidth). As the sweep segment becomes narrower, the speed becomes faster, and the accuracy
and resolution become enhanced.
The bandwidth can be set to 50 %, 30 %, or 10 % of the full span. The sweep speed will increase as follows:
50 %: about 2 times faster, 30 %: about 3 times faster, 10 %: about 10 times faster
S
PECTRUM
S
COPE
1.
By pressing the [
F6
(
CTR/FIX
)] key repeatedly, the
CTR mode and the FIX mode will be toggled alter-
nately.
2.
By pressing the [
F2
(
SPAN
)] key, you can set the band-
width of the span viewed using the Spectrum Scope.
By pressing the [
F2
(
SPAN
)] key, the span will change
as follows.
25 kHz
Æ
50 kHz
Æ
100 kHz
Æ
250 kHz
Æ
500 kHz
Æ
1000 kHz
Æ
2500 kHz
Æ
25 kHz
......
3.
Press the [
F3
(
ATT
)] key to set the desired attenua-
tion value.
By pressing the [
F3
(
ATT
)] key, the attenuation will
change as follows.
0 dB
Æ
10 dB
Æ
20 dB
Æ
0 dB
......
4.
By pressing the [
F7
(
LBWS
)] key, the LBWS segment
width will change as follows.
NORMAL
Æ
LBWS-1
(
50%
)
Æ
LBWS-2
(
30%
)
Æ
LBWS-3
(
10%
)
Æ
NORMAL
......
Advice
: Please note that the LBWS feature can not be
used in the FIX mode. Please use LBWS only in the CTR
mode.
Ø
Ï
[
F6
(
CTR/FIX
)]
Key
Ï
[
F7
(
LBWS
)]
Key
