Rohde & Schwarz CMU-K20, Operating Manual

Page: 127 / 646

CMU-K20/K21/K22/K23/K24 Non Signalling: Modulation Measurements
1115.6088.12 4.49 E-11
Parameter line The first parameter line contains the following settings:
Max. Level Maximum 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
Below the diagram, 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 output table contains the following scalar values:
Avg. Burst Power Average power of current burst (irrespective of the display mode
selected and of the current trace),
Statistic Count Number of sweeps per statistics cycle. The colored bar indicates
the relative measurement progress in the statistics cycle,
Bursts out of Percentage of bursts that violate the tolerance limits.
Tolerance
The following scalar values are calculated for the current burst first. 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 so far (Max/Min) is calculated:
Err. Vect. Magn. (Peak) Maximum EVM (application EVM 8PSK only)
Err. Vect. Magn. (RMS) Effective EVM (RMS-averaged over the burst)
Magn. Error (Peak) Maximum magnitude error (application Magn. Err. 8PSK
only)
Magn. Error (RMS) Effective magnitude error (RMS-averaged over the burst)
Phase Error (Peak) Maximum phase error (application Phase Err. 8PSK only)
Phase Error (RMS) Effective phase error (RMS-averaged over the burst)
Origin Offset Origin offset in the I/Q constellation diagram
Frequency Error Difference between measured and expected signal
frequency
Peak and RMS values are specific to the current application (Phase Error,
Magnitude Error or Error Vector Magnitude) . For an explanation of all quantities
measured refer to the beginning of this section on page 4.43 .
Limit Check A red output field and an arrow pointing upwards or downwards indicates that the
measurement result exceeds the upper or lower limit set in the
Limits tab of the TX
Tests configuration menu, see p. 4.52 .
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