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LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
505
User Manual 1173.9628.02 ─ 16
Global and list mode parameters
Some settings are available as special list mode settings and as "multi evaluation" set-
tings (e.g. duplex mode, cell bandwidth and modulation scheme). In list mode the
R&S
CMW ignores these "multi evaluation" parameters. All other settings not available
as special list mode settings are taken from the multi evaluation measurement, e.g.:
●
External Attenuation
●
Measure on Exception
●
Subframe Offset, Number of Subframes, Measure Subframe: always use the *RST
values (0, 1, 0) for list mode measurements
●
Trigger settings
●
Limit settings
3.2.3.2
Offline Mode and Offline Segment
In list mode, it is possible to select the results of a single segment for display in the
measurement diagram (see also
"List Mode > Offline Segment No."
This "offline mode" offers several advantages:
●
Check of the measurement results (e.g. while developing test scripts)
●
Calculation and display of additional measurement results (traces). Use the
FETCh:LTE:MEAS:MEValuation:TRACe:...
commands to retrieve these
results.
After a list mode measurement is completed, the measurement diagram shows the last
segment measured. Calculation of the offline results in an arbitrary segment requires a
two-stage measurement:
1. Start a single-shot list mode measurement (
INITiate:LTE:MEAS:
MEValuation
) to collect all measurement data.
2. Select the offline segment (
CONFigure:LTE:MEAS:MEValuation:LIST:
OSINdex <Segment>
), then initiate a second measurement (repeat
INITiate:LTE:MEAS:MEValuation
) and go to local in order to view the results.
The second measurement stage implies a calculation of all measurement results in the
offline segment from the existing raw data; no new measurement data is acquired. By
repeating this second stage for different segments, you can obtain a complete set of
measurement results over the entire measurement length.
Reconfiguration of the measurement, example
To obtain consistent results in the second measurement stage, the raw data must still
correspond to the measurement settings. Avoid any reconfiguration that would require
a new measurement, if you wish to re-use your data in offline mode.
General Description
深圳德标仪器
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