Measurements
R&S
®
FSW
207
User Manual 1173.9411.02 ─ 19
This leads to the following
combinations for overlapping ranges
:
●
"MAX+MAX"
: maximum of the two limit lines is used
●
"MAX+SUM"
: maximum of the two limit lines is used
●
"SUM+SUM"
: sum of the two limit lines (calculated for linear powers) is used
●
"NONE+MAX"
/
"NONE+SUM"
: limit line (and parameters) of the "NONE" range
are ignored
●
"NONE+NONE"
: depends on the position of the overlapping ranges in relation to
the mid-frequency between the two neighboring sub blocks:
–
overlap is completely
below
the mid-frequency: limits and parameters of the left
sub block are used
–
overlap is completely
above
the mid-frequency: limits and parameters of the
right sub block are used
–
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 RBW, as well as the
VBW, attenuation, reference level, transducer, filter type and (proportional) sweep time
of the range with the smaller RBW are considered for both ranges. In the range with
the higher RBW, the following offset is applied to the limit line:
-10*log(RBW
large
/ RBW
small
)
Table 5-12: 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
Spectrum Emission Mask (SEM) Measurement
