S820E UG PN: 10580-00343 Rev. H 3-51
Cable and Antenna Measurements 3-8 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 (Example from Figure 3-31) (1 of 2)
Example 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 memory trace from the
active trace.
(The active trace is displayed in Example B,
Trace – Memory as the yellow trace, and appears
different because trace math is applied to it.)
Note that the yellow Trace – Memory is at 0 or above
(and off the graph) whenever the yellow trace (as
shown in Example A) is above (has a greater value
than) the purple trace.
The two down sloping bumps in Example B are when
the purple trace (in Example A) moves above the
yellow trace. In Trace – Memory, this results in a
negative value being displayed.
C. Trace + Memory In the Trace + Memory graph, the yellow trace is the
result of adding the purple trace to the active trace.
(The active trace is displayed in Example C,
Trace + Memory as the yellow trace, and appears
different because trace math is applied to it.)
Note that the yellow Trace + Memory is below 60 (and
off the graph) whenever adding the yellow trace value
to the purple trace value is greater than 60 (refer to
Example A).
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