Keysight N9915-90020 User’s Guide 251
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
IQ Analysis (SA Mode Only)
How to Setup IQ Analysis General
General setup for IQ Analysis:
1. Press Meas Setup 4
> IQ Analysis > General
2. Press IQE Sample Rate > Auto (default).
3. Press
Average Count > 10 (default). Learn more refer to “Adjusting the
Measurement Setup Settings” on page 308
.
4. Press
Average Type > Auto (default). Learn more refer to “Adjusting the
Measurement Setup Settings” on page 308
.
5. Press Freq/Dist
> Center > 1 GHz
6. Press
Freq Span > 1 MHz (default).
How to Setup IQ Analysis Streaming (Requires Option 353 IQ
Streaming, SA Mode Only)
The feature provides continuous streaming of IQ data up to 1.25 MSamples/sec
over the Ethernet port in either VITA49A or Decodio formats.
If locked to GPS, will populate the timestamp applied to streamed data
packets. If not locked to GPS, the system clock time is used to stamp the
streamed data packets. Refer to
Chapter 31, “System Settings” and to
“Frequency Reference” on page 788.
General setup for IQ Streaming:
1. Press Meas Setup 4
> IQ Analysis > Streaming
2. Then IQE SampRate > Manual > 1.25 MHz (default when set to Auto).
Setting the IQE sample rate to Manual, forces the Span to be:
Span = 0.8 * Sample rate.
3. Configure Center Frequency, Span, Preamp, and RF Attenuation
a. Press Freq/Dist
> Center > 1 GHz 1 GHz
b. Press
Freq Span > 1 MHz (default).
This forces the Span to be:
Span = 1.25 * Span.
This feature’s intended use is that the Streamed data will be sent to
another computer. That computer or another one will act as a SCPI
controller and is required for actually controlling the streaming, in
particular setting up network data and starting and stopping the
streaming.
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