Keysight x-series User Reference Manual page 794

10 Monitor Spectrum Measurement
Meas Setup
Initial S/W Revision
Relative to CF
Chooses whether the limit line frequency points are coupled to the instrument center frequency, and
whether the frequency points are expressed as an offset from the instrument center frequency. If the limit
lines are specified with time, this has no effect. The limit table must in this case support negative
frequencies.
For example, assume you have a frequency limit line, and the analyzer center frequency is at 1 GHz. If
Relative to CF is "Off", entering a limit line segment with a frequency coordinate of 300 MHz displays the
limit line segment at 300 MHz, and the limit line segment will not change frequency if the center frequency
changes. If Relative to CF is "On", entering a limit line segment with a frequency coordinate of 300 MHz
displays the limit line segment at CF + 300 MHz, or 1.3 GHz. Furthermore, if the center frequency changes
to 2 GHz, the limit line segment will be displayed at CF + 300 MHz, or 2.3 GHz.
It is possible to change this setting after a limit line has been entered. When changing from On to Off or
vice-versa, the frequency values in the limit line table change so that the limit line remains in the same
position for the current frequency settings of the instrument.
Key Path
Remote Command
Example
Notes
Couplings
Preset
State Saved
Range
Initial S/W Revision
Relative to RL
Chooses 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
limit line segment at RL – 20 dB, or –30 dBm. Furthermore, if the reference level amplitude changes to –30
dBm, the limit line segment will be displayed at RL – 20 dB, or –50 dBm.
794
[Rel to CF + RL] – if both Relative to CF and RL set to ON.
A.13.00
Meas Setup, Limits, Properties, Fixed/Relative
:CALCulate:LLINe[1]|2|...|6:FREQuency:CMODe:RELative ON | OFF | 1 | 0
:CALCulate:LLINe[1]|2|...|6:FREQuency:CMODe:RELative?
CALC:LLIN:FREQ:CMOD:REL OFF Makes limit line 1 relative to the Center freq.
If the Trace Domain is changed to Time (:CALCulate:LLINe:CONTrol:DOMain TIME), the SCPI
command : :CALCulate:LLINe[1]|2|3|4|5|6:FREQuency:CMODe:RELative ON|OFF|1|0 will have no
effect.
Pressing this button makes Center Frequency the active function.
Off, not affected by Mode Preset, preset by Restore Mode Defaults.
Saved in instrument state
On|Off
A.13.00
EMI Receiver Mode Reference