3 Short-Range Comms & IoT Mode
3.10 Spurious Emissions Measurement
and the function is annotated on the trace if Trace Annotation is on
Status Bits/OPC
dependencies
*OPC can be used to detect the completion of a sweep, which will also correspond to the completion
of the math operation, since all math takes place during the sweep
Trace Math Options
IMPORTANT
To generate a trace math result,
you must take a sweep
. The trace math engine,
described below, operates in concert with the sweep engine in the instrument.
Until a sweep has been taken, even if the constituent traces are not in Update
mode, no result is generated.
Note that certain events can affect the trace in ways that affects all points at
once. This can happen in any number of ways, including:
–
A trace clear taking place
–
A trace being loaded from the file system
–
Trace data being sent in from the remote interface
–
A copy or exchange of trace data
You should try to avoid these occurrences during a sweep, as they will tend to
invalidate the math result being accumulated.
The Trace Math functions are:
Power Diff (Op1 – Op2)
Calculates a power difference between the First Trace operand and the Second
Trace operand and puts the result in the destination trace.
During the sweep, the following formula is executed for each point in the trace
operands, and the corresponding point is generated for the destination trace:
DestinationTrace = 10 log(10(1/10)(FirstTrace) – 10(1/10)(SecondTrace))
The values of the trace points are assumed to be in a decibel scale, as they are
internally stored.
If a point in FirstTrace is equal to maxtracevalue, the resultant point is also
maxtracevalue.
Otherwise, if the result of the subtraction is less than or equal to 0, the resultant
point is mintracevalue.
1500 Short Range Comms & IoT Mode User's &Programmer's Reference
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