S331L UG PN: 10580-00321 Rev. M 3-47
Cable and Antenna Measurements 3-7 Trace
Notes
The trace math functions often seem backwards to new
users. The points to remember with Trace - Memory,
Trace + Memory, and (Trc + Mem) / 2 are:
• The numbers on the y-axis are negative.
• The purple trace is added to or subtracted from the live
trace. The sum or difference of the live trace and
memory trace is displayed in yellow.
Table 3-1. Trace Math Details (1 of 2)
Example from
Figure 3-37 Example Description
A. Sample Traces Shows the live yellow trace and purple memory
trace.
B. Trace - Memory In the Trace - Memory graph the yellow trace is
the result of subtracting the purple trace from the
active trace (not displayed in Example B.
Trace - Memory, but shown in Example A).
Note that the yellow Trace - Memory is at 0 or
above (and off the graticule) whenever the yellow
trace is above (has a greater value than) the
purple trace (refer to A).
The two down sloping bumps in Example B are
when the purple trace moves above the yellow
trace. In Trace - Memory this results in a negative
value that is displayed.
C. Trace + Memory In the Trace + Memory graph the yellow trace is
the result of adding the purple trace to the active
trace (not displayed in Example C.
Trace + Memory, but shown in Example A).
Note that the yellow Trace + Memory is below 60
(and off the graticule) whenever adding the yellow
trace value to the purple trace value is greater
than 60 (refer to A).
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