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I
-
I
-
N
dB
Bandwidth
Measurement
It is often necessary to measure a signal response’s bandwidth, such as when
testing a band-pass
lilter.
The signal to be measured must be centered on the
display with a span that includes the full response. Activate the measurement
by turning the N
dE!
PTS
ON
OFF key (ON). The spectrum analyzer places
arrow markers at the -3
dB
points on either side of the response and reads
the bandwidth. For other bandwidth responses enter the number of
dB
down
desired, from 1
dB
to 80
dB.
No other signal can appear on the display within N
dB
of the highest signal.
The measured signal cannot have more than one peak that is greater than or
equal to N
dB.
A signal must have a peak greater than the peak excursion to
be identified. The default value for the peak excursion is 6
dB.
The N
dB
bandwidth measurement error is typically:
l about
f2
% of the span, for spans < 10 MHz
l about
f3
% of the span, for spans > 10 MHz
2c
b’
MKR-TRK
1.0
kHL
REF
48
8
dBrn”
AS
10
dB
37
57
dmn”
User
PEAK
Menus
LOG
10
dB/
pKEE
ON
OFF
%
AM
ON
OFF
TOI
ON
m
WA
SB
SC
FC
Power
CORR
Me”U
FFT
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Figure
5.32.
N dB Bandwidth Measurement
5-60