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Key Function Descriptions
Key Descriptions
WEIGHTNG √ COS OFF
root-raised-cosine weighting of the spectrum data for
an ACP measurement. This weighting simulates the
filtering expected in the radio receiver to be used.
Front-panel key access:
The root-raised-cosine weighting function is described
by the following equations:
∆f
≤
1 α
–
W ∆f
(
)
<
[
∆f
=
----------- -
2T
1 α
–
----------- -
2T
The resolution bandwidth of the spectrum analyzer is
of a finite width. Therefore, we compensate slightly for
α and for the threshold of the zero response:
1 α
–
----------- -
2T
Sets the span to 0 Hz. This effectively allows an
ZERO SPAN
amplitude versus time mode in which to view signals.
This is especially useful for viewing modulation.
Front-panel key access:
288
Turns on or off the function that does
MEAS/USER
1 α
–
→
W ∆f
(
)
------------
=
0dB
2T
1 α
–
]
<
→
[
∆f
]
(
----------- -
=
10dB
2T
≤
∆f
→
∆f
∞dB
=
–
SPAN
π 2 ∆f T
(
1
)log 10
-- - 1
--------------------------------- -
–
sin
2
2α
Chapter 4
)
–
1
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