GUI Reference
R&S
®
ZNB/ZNBT
504
User Manual 1173.9163.02 ─ 38
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 (|
a
n
| —> x*|a
n
|
➪
|b
n
| —> x*|b
n
|, so that the magnitude of all S-parameters remains con-
stant).
●
"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).
●
"Cmp Out" is the sum of the stimulus level "Cmp In" and the magnitude of the mea-
sured 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>. The example above is based on an attenuation
of –20.8 dB, hence "Cmp Out" = –24.9 dB – 20.8 dB = –45.7 dBm.
The info field shows invalid results ('----') if the wrong sweep type or trace format is
selected, or if the trace contains no x-dB compression points in the selected evaluation
range.
Remote command:
CALCulate<Chn>:STATistics:NLINear:COMP[:STATe]
CALCulate<Chn>:STATistics:NLINear:COMP:RESult?
CALCulate<Chn>:STATistics:NLINear:COMP:LEVel
CALCulate<Chn>:STATistics[:STATe]:AREA
Decimal Places...
Opens the System Config dialog to define the (maximum) number of fractional digits
for setting values and measurement results. See also
5.12.6.2
Evaluation Range Dialog
The "Evaluation Range" dialog defines the range for the "Trace Statistics" and certain
marker search results (bandfilter and multiple peak search). The evaluation range is a
continuous interval of the sweep variable.
Access:
TRACE – TRACE CONFIG > "Trace Statistics" > "Eval. Range..."
Trace Config Softtool
