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Trace/Detector
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 test sets. The offset is entered as the active function. Each
destination trace has its own offset.
During the sweep, the following formula is executed for each point in the trace operand, and the
corresponding point is generated for the destination trace.:
DestinationTrace = FirstTrace + Offset
The values of the trace points are assumed to be in dBm (as they are internally stored) and the offset is in
dB.
If a point in the trace operand is equal to maxtracevalue, the resultant point is also maxtracevalue.
If a point in the trace operand is equal to mintracevalue, the resultant point is also mintracevalue.
Example: If offset is 25 dB, then our destination trace is higher than the operand trace by 25 dB.
Note that the
Second Trace operand is not used for this function.
Log Diff (Op1-Op2+Ref)
Offsets the difference between the
First Trace operand and the Second Trace operand by a reference
and puts the result in the destination trace. This is like the A-B+DL function in some older test sets. The
reference is entered as the active function. Each destination trace has its own reference.
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 = (FirstTrace - SecondTrace) + Reference
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
Key Path Trace/Detector, Math
Example :CALC:MATH TRACE1,LOFF,TRACE4,,–6.00,
sets Trace 1 to
Log Offset trace math function, sets the First Trace operand
(for Trace 1) to Trace 4, leaves the
Second Trace operand (for Trace 1)
unchanged (it is irrelevant for this function) and sets the Log Offset (for Trace
1) to –6 dB.
Couplings Selecting a math mode other than Off for a trace (pressing the key or sending
the equivalent SCPI command) puts the trace in View (
Update On and
Display On)
, even if that math mode was already selected.
State Saved The Log Offset value for each trace is saved in Instrument State
Min –100 dB
Max 100 dB
Initial S/W Revision Prior to A.02.00