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GUI Reference
R&S
®
ZNB/ZNBT
327
User Manual 1173.9163.02 ─ 55
The compression point is a measure for the upper edge of the linearity range of a DUT.
It is close to the highest input signal level for which the DUT shows a linear response,
so that the magnitude of all S-parameters remains constant).
●
"Cmp In" is the stimulus level at the compression point in units of dBm. "Cmp In"
always corresponds to the driving port level (e.g. the level from port no. j, if a trans-
mission parameter S
ij
is measured).
●
For dB formatted traces, "Cmp Out" is the sum of the stimulus level "Cmp In" and
the magnitude of the measured response value at the compression point. The
magnitude of a transmission S-parameter S
ij
is a measure for the attenuation (or
gain) of the DUT, hence: "Cmp Out" = "Cmp In" + <Attenuation>.
For phase formatted traces, "Cmp Out" is the response value at the compression
point.
The info field shows invalid results ('----') if the wrong sweep type or trace format is
selected, or if no compression point with the configured properties was found.
Remote command:
CALCulate<Chn>:STATistics:NLINear:COMP[:STATe]
CALCulate<Chn>:STATistics:NLINear:COMP:LEVel
CALCulate<Chn>:STATistics:NLINear:COMP:PHASe
CALCulate<Chn>:STATistics:NLINear:COMP:RESult?
CALCulate<Chn>:STATistics[:STATe]:AREA
Reference Value
Selects the reference value ("small signal value") for the compression point calculation.
"First Point"
(default)
uses the value at the first point of the selected evaluation range as
the reference value (see
Chapter 6.5.8.2, "Evaluation Range Dialog"
"Selected
Marker"
uses the value at a selectable marker as the reference value (see
"Range"
uses the average value in a configurable
as the reference value
"Defined
Value"
allows to specify the reference value manually (see
Trace Config Softtool