Service manual

Instrument Functions WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
69Operating Manual 1176.7649.02 ─ 04
R&S Support ← PVT
Stores useful information for troubleshooting in case of errors.
This data is stored in the C:\R_S\Instr\user\Support directory on the instru-
ment.
If you contact the Rohde&Schwarz support to get help for a certain problem, send
these files to the support in order to identify and solve the problem faster.
EVM Constell
Opens a submenu to select the error vector magnitude (EVM) or the constellation
result displays.
Settings General/Demod ← EVM Constell
See "Settings General/Demod" on page 64
Display List/Graph ← EVM Constell
See "Display List/Graph" on page 64
EVM vs Symbol/Carrier ← EVM Constell
Selects the EVM vs Symbol or EVM vs Carrier result displays.
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EVM vs Symbol
This result display shows the EVM measured over the full range of the measured
input data. The results are displayed on a per-symbol basis, with blue vertical lines
marking the boundaries of each PPDU. Note that PPDU boundary lines are only
displayed if the number of analyzed PPDUs is less than 250.
For IEEE 802.11a, j, g (OFDM) n & p the minimum, average, and maximum traces
are displayed.
For IEEE 802.11b, g (Single Carrier) two EVM traces are displayed. The trace
labeled with VEC ERR IEEE shows the error vector magnitude as defined in the
IEEE 802.11b, g standards. For the trace labeled with EVM a commonly used EVM
definition is applied, which is the square root of the momentary error power normal-
ized by the averaged reference power.
Softkeys of the WLAN TX Menu