Rohde & Schwarz R&S UPP, User Manual

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Instrument Functions
R&S
®
UPP
546 User Manual 1411.1055.32 ─ 10
"Manual" The following x-axis parameter field is operable and completely inde-
pendent of a sweep setting in the generator. It is reserved for the spe-
cial case of graphically displaying self-generated or manipulated trace
data records that are transferred from the controller via the IEC bus to
the R&S
UPP.
Example:
The distortion of an amplifier versus its output voltage is to be graph-
ically displayed by means of a generator sweep.
At first glance, this does not seem to be possible, for normally only
the generator voltage supplied by the R&S
UPP (i.e. the amplifier's
input voltage) can be swept and projected onto the x-axis.
However, the user would like to display the distortion factor over the
output voltage on the amplifier in order to be able to assess how the
distortion factor changes if the amplifier reaches its limits.
To be able to display the output voltage on the x-axis, this voltage
must be measured in addition to the distortion. From these two series
of measurements, it is possible to generate a trace data set and save
it as a trace file using Visual Basic, for example, in order to graphi-
cally display the data set with the setting "Manual " and the following
"x-axis " = "Voltage " parameter field.
"LevMon RMS" The measured level monitor RMS value is plotted on the x-axis if the
level monitor is on.
"LevMon DC" The measured level monitor DC value is plotted on the x-axis if the
level monitor is on.
"LevMon
Peak" The measured level monitor peak value is plotted on the x-axis if the
level monitor is on.
"Frequency" The measured frequency is plotted on the x-axis.
Remote command:
DISPlay:SWEep<n2>:X:SOURce
on page 802
X-axis
The parameter displayed in the selection field depends on the graphic subsystem in
which the parameter field is offered.
For the graphic subsystem FFT Graph, the parameter is always "Frequency " and can-
not be changed.
For the graphic subsystem Waveform, the parameter is always "Time " and can also
not be changed.
The Bar Graph graphics subsystem has an unscaled x-axis that is not displayed, and
thus cannot be changed.
Curve, Spectrum and Bar Graph Display