Agilent Technologies 86140B Series, User Manual

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3-35
Function Reference
Log Math C=A–B
Remote
Commands GPIB GoTo Local Command
Log Math C=A
–
B
Subtracts Trace B from Trace A point by point, then stores the results in Trace
C in logarithmic units. If Trace A is in View On mode, this function is continu-
ous and occurs every sweep. Results of the subtraction are referenced to 0 dB.
This often requires a reference level adjustment. For example, if the reference
level is set at –40 dBm, Trace A is at –50 dBm, and Trace B is at –55 dBm, the
C=A–B function places Trace C at –5 dB. Because this is off screen, the refer-
ence level will need to be adjusted.
Key Path Traces > Trace Math OFF > Default Math Trace C > Log Math C=A–B
Related Functions Log Math C=A+B, Log Math F=C–D
Remote
Commands CALCulate3:MATH:EXPRession(TRA/TRB)
Log Math C=A+B
Adds Trace A and Trace B point by point, then stores the results in Trace C in
logarithmic units. The results of this function often require a reference level
adjustment. Trace A is placed in View On mode. Trace math is mainly used to
normalize the display during stimulus-response measurements.
Key Path Traces > Trace Math OFF > Default Math Trace C > Log Math C=A+B
Related Functions Log Math C=A–B, Log Math F=C–D
Remote
Commands CALCulate3:MATH:EXPRession(TRA*TRB)