Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
237
User Manual 1178.8520.02 ─ 08
Limit check behavior for overlapping masks
Since spectrum emission masks are defined individually for each sub block, and sub
blocks can overlap, the question arises what happens during the limit check in the
overlapping regions? To answer this question, we must distinguish the following cases:
●
For the reference range, no limit checking is performed, as the reference range
contains the carrier
●
For other ranges, only the limit lines defined for ranges between the carriers, that is
the reference ranges to either side, are significant. In other words: if a limit line def-
inition covers the frequency area of several carriers, only the limit lines for ranges
between the corresponding reference range and the next closest reference range
are significant.
Figure 5-43: Behavior for overlapping masks
●
For the ranges in which multiple limit lines are significant, a range-specific function
determines the behavior of the limit check
Limit calculation for individual ranges
For each range a function can be defined that determines the behavior of the limit
check if there are multiple limit lines:
●
"NONE"
: In reference ranges no limit check is performed;
Reference ranges always use the function "NONE".
For other ranges, see the combinations for overlapping ranges below.
●
"SUM"
: sum of the two limit lines (calculated for linear powers) is used
●
"MAX"
: maximum of the two limit lines is used
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
Spectrum emission mask (SEM) measurement
