Service manual

WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
51Operating Manual 1176.7649.02 ─ 04
I/Q measurements (based on captured IQ data)
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Power vs Time (see "PVT" on page 64)
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EVM vs Symbol, EVM vs Carrier (see "EVM vs Symbol/Carrier" on page 69 soft-
key)
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Phase vs Preamble, Frequency vs Preamble (see "Error Frequency/Phase"
on page 71 softkey)
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Spectrum Flatness (see "Spectrum Flatness (IEEE 802.11a, ac, g, j, n (OFDM), p /
Group Delay (IEEE 802.11 n (MIMO))" on page 76 softkey)
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Spectrum FFT (see "Spectrum FFT" on page 79 softkey)
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Constellation vs Symbol, Constellation vs Carrier (see "Constell vs Symbol/Carrier"
on page 73 softkey)
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Conditional Cumulative Distribution Function (see "CCDF" on page 83 softkey)
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Bit Stream (see "Bitstream" on page 83 softkey)
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Signal Field (see "Signal Field (IEEE 802.11a, ac, g (OFDM), j , n, p)" on page 85
softkey)
When using the IEEE 802.11n standard, I/Q measurements are available both in SISO
mode (one antenna, one data stream), and MIMO mode (several antennas, several
data streams). For details see chapter 3.6, "IEEE 802.11n/ac MIMO Measurements",
on page 36.
Measurement result display
The measurement result display is divided into two panes:
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chapter 3.9.1, "Measurement Settings", on page 51
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Result displays
The results can be displayed in form of a list or a graph (see also "Display List/Graph"
on page 64 softkey).
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chapter 3.9.2, "Result Summary List", on page 54
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chapter 3.9.3, "Result Display Graph", on page 59
Saving results
The measurement results can be stored at any time using the SAVE/RCL key (see the
base unit description). Both the measured I/Q data and the trace and table results can
be stored individually. Furthermore, any limit values modified in the result summary
can also be stored. Note that for trace and table results, the originally measured values
are always stored. The values are not updated after changes to the Demod Settings.
I/Q data, on the other hand, can be refreshed before it is stored.
3.9.1 Measurement Settings
The overall measurement settings used to obtain the current measurement results are
displayed in the channel bar:
Measurement Settings and Result Displays