Rohde & Schwarz CMU-K20, Operating Manual

Page: 135 / 646

CMU-K20/K21/K22/K23/K24 Non Signalling: Spectrum Measurements
1115.6088.12 4.57 E-11
The following parameter is specific to the Spectrum due to Switching measurement
and provided for both GSMK and 8PSK modulation:
Slot
Count
Slot Count defines whether a single timeslot or all timeslots are considered for the
Spectrum due to Switching measurement:
Single The CMU measures the peak power in a fixed timeslot. The
measured timeslot is given by the trigger time plus the
Trig. Slot
Offset; see Fig. 4-3 on p. 4.18 . A measurement cycle with
Statistic Count = n Bursts extends over n TDMA frames, where
only the fixed timeslot, including the burst edges, is measured.
Multi The CMU measures the peak power over all 8 timeslots of the
TDMA frame. The carrier output power (central bar in the
Spectrum due to Switching diagram) is measured in the timeslot
defined by the trigger time plus the Trig. Slot Offset (Measured
Timeslot; see Fig. 4-3 on p. 4.18 ) . A measurement cycle with
Statistic Count = n Frames extends over n TDMA frames.
The single slot measurement is faster and is correct if the DUT operates in single
slot mode. The multislot measurement yields the correct
Spectrum due to
Switching for any multislot configuration and for any levels in the individual UL
timeslots. The measured off-carrier power does not depend on the Measured
Timeslot, however, the Measured Timeslot has an influence on the measured
carrier output power and thus on the limit lines (see Table 4-3 on p. 4.65 ). The
Measured Timeslot can be changed in order to select the highest MS output power
as a reference for the tolerance template, in close analogy to the single slot mode.
Remote control
CONFigure:SPECtrum:SWITching[:GMSK]:SCOunt SSL | MSL
CONFigure:SPECtrum:SWITching:EPSK:SCOunt SSL | MSL
Appli-
cation
The Application softkey changes the type of spectrum to be measured and the
modulation scheme. The two alternative spectra (applications) are displayed in
separate measurement menus. When an application is selected, the corresponding
measurement menu is called up and the labeling of the measurement control
softkey is adapted. The configuration settings for both applications, however, are
listed in a common popup menu (see p.
4.61 ff.).
Modulation
GMSK
The Modulation GMSK hotkey selects the spectrum due to modulation for GMSK
modulated signals to be displayed. In this mode, the power at the nominal
frequency and the relative power at up to 11 neighboring frequencies is displayed
in a single graph, see p.
4.58 ff.
Remote control
No explicit switchover command. All spectrum due to modulation measurements
are identified by the 2
nd
to 4
th
level keywords
..SPECtrum:MODulation[:GMSK]
Modulation
8PSK
The Modulation 8PSK hotkey selects the spectrum due to modulation for 8PSK
modulated signals to be displayed. In this mode, the power at the nominal
frequency and the relative power at up to 11 neighboring frequencies is displayed
in a single graph, see p.
4.58 ff.
Remote control
No explicit switchover command. All spectrum due to modulation measurements
are identified by the 2
nd
to 4
th
level keywords
..SPECtrum:MODulation:EPSK
深圳德标仪器
135-1095-0799