Rohde & Schwarz FSV3000, Руководство пользователя

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Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
238 User Manual 1178.8520.02 ─ 08
– Overlap crosses the mid-frequency: new subranges are created: one to the left
of the mid-frequency, one to the right of the mid-frequency. The left subrange
uses the limits and parameters of the left sub block, the right subrange uses
the limits and parameters of the right sub block.
Different RBWs in overlapping ranges
If different RBWs are defined for the overlapping ranges, the following parameters from
the range with the smaller RBW are considered for both ranges:
●
RBW
●
VBW
●
Attenuation
●
Reference level
●
Transducer
●
Filter type
●
(proportional) sweep time
In the range with the higher RBW, the following offset is applied to the limit line:
-10*log(RBW
large
/ RBW
small
)
Table 5-11: Limit lines in overlapping ranges crossing the mid-frequency
Initial situation : overlapping ranges
Range 4 ("None") + Range 5 ("None") overlap and cross the
mid-frequency between sub blocks 1 and 2
Result: Subranges 4a and 5a are created left and right of the
mid-frequency;
For subrange 4a: limit line and parameters of range 4 apply
For subrange 5a: limit line and parameters of range 5 apply
Global SEM limit check
For the complete SEM measurement, which can consist of multiple sub blocks, only
one single limit check is performed. A single limit line is calculated according to the
individual range limit lines and the defined functions for overlapping ranges. The mea-
Spectrum emission mask (SEM) measurement