Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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CMU-K20/K21/K22/K23/K24 Non Signalling: Modulation Measurements
1115.6088.12 4.51 E-11
Fig. 4-22 Modulation Configuration – Control
The settings can be defined separately for the different applications of the
Modulation measurement
group. Most functions are analogous to those of the menu Control in the menu group Power (see page
4.28 ). In the remote-control commands, the keyword
POWer
is to be replaced by
MODulation
. The
following parameters are specific to the Modulation measurement:
Default Settings The Default Settings switches assign default values to all settings in the Control tab
belonging to an individual application (the default values are quoted in the
command description in chapter 6 of this manual).
Remote control
CONFigure:MODulation:XPERror[:GMSK]:CONTrol:DEFault ON | OFF
etc.
Display Mode The Display Mode field defines which of the measured and calculated
measurement curves is displayed. The measurement curves differ in the way the
measured quantity at a fixed point in time
t is calculated if the measurement
extends over several bursts
Current Measured value for the current burst
Max./Min. Extreme value over a number of bursts
Average Average value over a number of bursts
The number of bursts for the calculation of the statistic values Minimum/Maximum
and Average – and thus the result – depends on the repetition mode set (see
section Measurement Control (Power Configuration – Control) on page 4.28 ). In
detail, this implies:
Single shot Display of minimum, maximum and average value from the
performed statistics cycle
Continuous Display of minimum and maximum from all bursts already
measured. The
average value , however, is calculated according
to the averaging rule in Chapter 3, section General Settings .
In a power measurement absolute values are determined, whereas the measured phase
error can have both positive or negative sign. To assess the phase error only the magnitude
(and not the sign) is of importance so that extreme values are output in the menu
Modulation
instead of maxima and minima.
Remote control
no display mode set, the four measurement curves are accessible via
FETCh:ARRAy:MODulation:XPERror[:GMSK][:BURSt]
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