Spectrum Measurements
R&S
®
ESR
270
User Manual 1175.7068.02 ─ 12
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RBW
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VBW
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Sweep time
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Sweep points
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Reference level
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Attenuator settings
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Limit values
Via the sweep list, you define the ranges and their settings. For details on settings refer
to
For details on defining the limits (masks) see
"Working with Limit Lines in SEM Mea-
For details on defining the limits (masks) see the base unit description "Working with
Lines in SEM".
The following rules apply to ranges:
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The minimum span of a range is 20 Hz.
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The individual ranges must not overlap (but need not directly follow one another).
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The maximum number of ranges is 20.
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A minimum of three ranges is mandatory.
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The reference range cannot be deleted (it is marked in blue color).
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The reference range has to be centered on the center frequency.
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The minimum span of the reference range is given by the current TX Bandwidth.
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Frequency values for each range have to be defined relative to the center fre-
quency.
In order to change the start frequency of the first range or the stop frequency of the last
range, select the appropriate span with the [SPAN] key. If you set a span that is smaller
than the overall span of the ranges, the measurement includes only the ranges that lie
within the defined span and have a minimum span of 20 Hz. The first and last ranges
are adapted to the given span as long as the minimum span of 20 Hz is not violated.
Symmetrical ranges
You can easily define a sweep list with symmetrical range settings, i.e. the ranges to
the left and right of the center range are defined symmectrically. In the "Sweep List"
menu, select the "Symmetrical Setup" softkey to activate symmetrical setup mode. The
current sweep list configuration is changed to define a symmetrical setup regarding the
reference range. The number of ranges to the left of the reference range is reflected to
the right, i.e. any missing ranges on the right are inserted, while superfluous ranges
are removed. The values in the ranges to the right of the reference range are adapted
symmetrically to those in the left ranges.
For details see
Symmetrical ranges fulfull the conditions required for "Fast SEM" mode (see
Spectrum Emission Mask Measurements"
Measurements
