3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
The values of the operand trace points are assumed to be in decibel units (as they
are internally stored) and the reference is in dBm so the result is in dBm.
Example: If the first operand trace 1 is at 5 dBm, the second operand trace 2 is at –5
dBm, and the reference is –25 dBm, then the destination trace will be –15 dBm.
Example: If the first operand trace1 is at 60 dBuV, the second operand trace 2 is at
50 dBuV, and the reference is 35 dBuV, then the destination trace will be 45 dBuV.
If a point in FirstTrace is equal to maxtracevalue, the resultant point is also
maxtracevalue.
If a point in FirstTrace is equal to mintracevalue, the resultant point is also
mintracevalue.
If neither of the above is true for a given point, then:
–
If that point in SecondTrace is equal to maxtracevalue, the resultant point is
mintracevalue.
–
If that point in SecondTrace is equal to mintracevalue, the resultant point is
maxtracevalue.
How trace math is processed
Whenever a trace math function is turned on, or the parameters and/or operands of
an existing trace math function are changed, the destination trace is cleared. After
the trace is cleared, all x-axis values in the trace, and the domain of the trace, are
set to match the X-Axis settings of the first trace operand. When this is complete, a
new sweep is initiated.
The process of acquiring data, processing it using the math and Average/Hold
functions, and presenting it as trace data, consists of several functional blocks, as
shown below:
534 Spectrum Analyzer Mode User's &Programmer's Reference
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