Agilent Technologies X Series Manual page 464

Input/Output
Key Path
Example
Dependencies
Couplings
Readback Text
Initial S/W Revision
Linear Video (RF Envelope, Ref=Ref Level)
Selects the analog output to be the envelope signal on a linear (voltage) scale. In this mode, the
pre-detector data is output to the Analog Out connector with a Linear scaling. The output is based on the
current Reference Level, and is not influenced by the selected detector or any digital flatness corrections
or trace post-processing (like Trace Averaging).
The scaling is set so that 1 V output occurs with an instantaneous video level equal to the reference level,
and 0 V occurs at the bottom of the graticule. This scaling gives you the ability to control the gain
without having another setup control for the key. But it requires you to control the look of the display
(the reference level) in order to control the analog output.
This mode is ideal for looking at Amplitude Modulated signals, as the linear envelope effectively
demodulates the signal.
Key Path
Example
464
Input/Output, Output Config, Analog Out
OUTP:ANAL LOGV
Because the Log Video output uses one of the two IF processing channels,
only one detector is available while Screen Video is selected. All active traces
will change to use the same detector as the selected trace when Log Video is
activated.
Log Video output is not available while any EMI Detector is selected (Quasi
Peak, RMS Average or EMI Average), because these detectors use both IF
processing channels. Consequently, if the user chooses an EMI Detector, there
will be no Log Video output.
The output holds at its last value during an alignment, during a marker count,
and during retrace (after a sweep and before the next sweep starts).
This function depends on optional capability. The key will be blanked and the
command will generate an "Option not available" error unless you have
Option YAV licensed in your instrument.
Log Video output changes while in FFT Sweeps, so for measurements that use
exclusively FFT Sweeps, or if the user manually chooses FFT Sweeps, the
Log Video output will look different than it does in swept mode.
Log Video
A.04.00
Input/Output, Output Config, Analog Out
OUTP:ANAL LINV