Rohde & Schwarz R&S FSP Series, Operating Manual

Page: 182 / 796

R&S FSP Instrument Functions
Analyzer Mode
4.110 Operating Manual 1164.4556.12 - 06
X-AXIS RANGE The X-AXIS RANGE softkey changes the level range to be covered by the statistics
measurement selected.
The function is identical to softkey RANGE LOG MANUAL in AMPT menu.
Remote command:
CALC:STAT:SCAL:X:RANG <value>
Y-UNIT (% ABS) The softkey Y-UNIT (% ABS) defines the scaling type on the y-axis. The default
case are the absolute probability. This can be changed to percent values. The soft-
keys
Y-AXIS MIN and Y-AXIS MAX are using values based on the Y-UNIT setting.
Remote command:
CALC:STAT:SCAL:Y:UNIT PCT | ABS
The 0.01%, 0.1%, 1% and 10% value from the CCDF measurement are shown in
the bottom screen half. Those values can also queried via remote:
Remote command:
CALC:STAT:CCDF:X? P0_01 | P0_1 |
P1 | P10
Y-AXIS MAX
VALUE
The Y-AXIS MAX VALUE softkey defines the upper limit of the displayed probability
range.
Values on the y-axis are normalized which means that the maximum value is 1.0. As
the y-axis scaling has a logarithmic axis the distance between max and min value
must be at least one decade.
Remote command:
CALC:STAT:SCAL:Y:UPP <value>
Y-AXIS MIN
VALUE
The Y-AXIS MIN VALUE softkey defines the lower limit of the displayed probability
range.
As the y-axis scaling has a logarithmic axis the distance between max and min value
must be at least one decade. Valid values are in the range 0 < value < 1.
Remote command:
CALC:STAT:SCAL:Y:LOW <value>
ADJUST
SETTINGS
The ADJUST SETTINGS softkey optimizes the level settings of the R&S FSP
according to the measured peak power in order to gain maximum sensitivity of the
instrument.
The level range is adjusted according to the measured difference between peak and
minimum power for APD measurement and peak and mean power for CCDF mea-
surement in order to obtain maximum power resolution.
Additionally the probability scale is adapted to the selected number of samples.
Remote command:
CALC:STAT:SCAL:AUTO ONCE
DEFAULT
SETTINGS
The DEFAULT SETTINGS softkey resets the x- and y-axis scalings to their PRESET
values.
• x-axis ref level: -20 dBm
• x-axis range APD: 100 dB
• x-axis range CCDF: 20 dB
• y-axis upper limit: 1.0