3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
change so that the limit line remains in the same position for the current frequency
settings of the instrument.
Pressing this button makes Center Frequency the active function.
Remote
Command
:CALCulate:LLINe[1]|2|…|6:FREQuency:CMODe:RELative ON | OFF | 1 | 0
:CALCulate:LLINe[1]|2|…|6:FREQuency:CMODe:RELative?
Example Make Limit Line 1 relative to Center Frequency:
:CALC:LLIN:FREQ:CMOD:REL ON
Notes If the Trace Domain is changed to Time (:CALCulate:LLINe:CONTrol:DOMain TIME),
:CALCulate:LLINe[1]|2|3|4|5|6:FREQuency:CMODe:RELative ON|OFF|1|0 has
no effect
Couplings Pressing this control makes Center Frequency the active function
Preset
OFF
Not affected by Mode Preset, preset by Restore Mode Defaults
State Saved Saved in instrument state
Amplitude Interpolation
Sets the interpolation to linear or logarithmic for the specified limiting points set,
allowing you to determine how limit trace values are computed between points in a
limit table. See Frequency Interpolation for the equations used to calculate limit
values between points.
Remote
Command
:CALCulate:LLINe[1]|2|…|6:AMPLitude:INTerpolate:TYPE LOGarithmic | LINear
:CALCulate:LLINe[1]|2|…|6:AMPLitude:INTerpolate:TYPE?
Example Set Limit Line 1 amplitude interpolation to linear:
:CALC:LLIN:AMPL:INT:TYPE LIN
Preset
LOGarithmic
Not affected by Mode Preset, preset by Restore Mode Defaults
State Saved Saved in instrument state
Amptd Reference
Specifies whether the limit line amplitude points are coupled to the instrument
reference level, and whether the amplitude points are expressed as an offset from
the instrument reference level.
For example, assume you have a limit line, and the reference level at –10 dBm. If
Relative to RL is Off, entering a limit line segment with an amplitude coordinate of –
20 dB displays the limit line segment at –20 dBm, and the limit line segment will not
change amplitude if the reference level amplitude changes. If Relative to RL is On,
entering a limit line segment with an amplitude coordinate of –20 dB displays the
398 Spectrum Analyzer Mode User's &Programmer's Reference
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