Rohde & Schwarz CMU-K20, Operating Manual

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CMU-K20/K21/K22/K23/K24 Non Signalling: Modulation Measurements
1115.6088.12 4.47 E-11
a) Scalar Results (Overview)
The measurement menu for the application Overview 8PSK shows all scalar results. Most of the values
are indicated in tabular form:
Parameter line
Output fields
Output table
and additional fields
Fig. 4-20 Display of results (Modulation – Overview)
Parameter line The parameter line contains the following settings:
Max. Level Maximum expected input level set as in the Analyzer tab of
the Connection Control menu (see section Table-Oriented
Version on p. 4.73 ff.),
Attenuation Setting for the external attenuation of the input level (Normal,
Low Noise, Low Distortion) ,
Freq. Offset Frequency offset compared to the nominal channel
frequency,
Chan./Trig. Slot Offs. RF channel and trigger slot offset (see Trig. Slot Offset
hotkey on p. 4.18 )
Remote control The settings are retrieved using the query corresponding to the setting command
(setting command with appended question mark).
Output fields
In the output fields in the center of the menu, the following results are displayed:
TSC detected Detected training sequence of the current burst received from
the mobile station
(GSM 0 to 7 or Dummy or "---"), see Analyzer
tab, section Table-Oriented Version on p. 4.73 ff.
95
th
percentile Limit values below which 95% of the measured Error Vector
Magnitudes, Magnitude Errors, and Phase Errors in the current
burst are located. Owing to this definition, the 95
th
percentile of a
measured quantity has the same unit as the quantity itself.
Output table The scalar values in the output table are explained at the beginning of this section
on page
4.43 . They are first calculated for the current burst. From the current
results the average referenced to a statistics cycle ( Average, see averaging rule in
Chapter 3, section General Settings) and the extreme value over all bursts
measured during the ongoing measurement (Max/Min) is calculated. Peak and
RMS 1 values are taken over the whole useful part of the burst.
1
To keep the results comparable, RMS averaging was chosen for both positive quantities and quantities with alternating sign. The RMS-averaged EVM is calculated
according to the rule of GSM 05.05.
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