MSRA basics
R&S
®
FSWP-B1
29
User Manual 1177.5862.02 ─ 09
5.4
Restrictions for secondary applications
As mentioned in various contexts before, the MSRA secondary applications them-
selves are identical to Signal and Spectrum operating mode, however, the correlation
between secondary applications and the MSRA primary require some restrictions. Prin-
cipally, you are not restricted in setting parameters. However, if any contradictions
occur between the configured capture settings and the analysis settings, error mes-
sages are displayed in the status bar of the secondary application and an icon ( ) is
displayed next to the channel label. However, it does not matter in which order you
configure the settings - you will not be prevented from doing so.
In particular, the following restrictions apply to secondary applications in MSRA mode:
●
Data acquisition
: parameters related to data acquisition can only be configured by
the MSRA primary
●
Secondary application data
: only data contained in the capture buffer can be
analyzed by the secondary application; this implies the following restrictions:
–
Center frequency
: must lie within the captured data bandwidth
–
Measurement time/Record length
: must be smaller than or equal to the val-
ues of the MSRA primary
–
Capture offset
: must be smaller than the record length of the MSRA primary
–
Trace averaging
: only for sweep count = 0
●
AUTO SET functions
: in secondary applications, only the frequency can be adjus-
ted automatically; all other adjustment functions require a new data acquisition
5.5
Measurements in the time and frequency domain
The I/Q Analyzer secondary application (
not Primary
)
in multistandard mode
can also
perform measurements on the captured I/Q data in the time and frequency domain. In
order to do so, the I/Q Analyzer performs an FFT sweep on the captured I/Q data, pro-
viding power vs frequency results, or uses the RBW filter to obtain power vs time (zero
span) results. This data is then used for the common frequency or time domain mea-
surements provided by the R&S
FSWP Spectrum application, such as ACLR, SEM or
CCDF.
Configuration
Apart from the data capturing process, the measurements are identical in the Spectrum
and I/Q Analyzer secondary applications. They are configured using the same settings
and provide the same results. The "Magnitude" result display in the I/Q Analyzer, for
instance, will principally show the same results as the zero span measurement for the
same data. However, while the "Magnitude" evaluation is configured by the I/Q analy-
sis bandwidth and the measurement time, the zero span measurement is configured by
the center frequency, RBW and sweep time settings. Internally, these "time domain"
settings are converted to the required I/Q settings by the I/Q Analyzer.
The time and frequency domain measurements and the required settings are descri-
bed in detail in the R&S
FSWP User Manual.
Measurements in the time and frequency domain