3 Short-Range Comms & IoT Mode
3.8 SEM Measurement
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Trace data being sent in from the remote interface
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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.
Power Sum (Op1 + Op2)
Calculates a power sum 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 either trace operand is equal to maxtracevalue, the resultant point is
also maxtracevalue.
Log Offset (Op1 + Offset)
Calculates a log offset from the First Trace operand and puts the result in the
destination trace. This is like the B-DL function in some older instruments. The offset
is entered on the Offset control, which only appears when this math function is in
force for the selected trace. Each destination trace has its own offset.
Short Range Comms & IoT Mode User's &Programmer's Reference 1207
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