Acquire the Signal
1.
Push
BW
to bring up the resolution
bandwidth side menu. This allows you to set
the smallest frequency difference that the
instrument can discern in the frequency axis.
Bandwidth
2.
Push
RBW Mode
to select either
Auto
or
Manual
.
Auto
sets the resolution bandwidth
automatically as you change the span. The
default behavior is RBW = Span/1000.
Manual
allows you to set your own
resolution bandwidth.
RBW
Mode
Auto
Manual
3.
To manually adjust the RBW, push
RBW
and turn
Multipurpose a
.
RBW
(a)
600 kHz
(Auto)
4.
Push
Span : RBW
and turn
Multipurpose
a
to set the span/RBW ratio.
This ratio is used when the
RBW Mode
is
set to
Auto
. The default is 1000:1 but you
can set it to other values in a 1-2-5 sequence
(e.g. 1000, 20000, 50000).
Span :
RBW
1000 : 1
5.
Push
Window
and turn
Multipurpose a
to
choose which FFT window type to use.
The choices are: Kaiser, Rectangular,
Hamming, Hanning, Blackman-Harris, or
Flat-Top.
Window
Kaiser
The RF bandwidth FFT feature provides six windows. Each offers a trade-off between frequency resolution and magnitude
accuracy. The choice of which window to use depends upon what you want to measure and your source’s signal
characteristics. Use the following guidelines to select the best window:
MDO3000 Series Oscilloscopes User Manual
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