Setting up an IQ capture/streaming measurement begins with setting up the basic measurement parameters:
• For spectrum analyzer measurement setup, refer to Spectrum Analyzer measurement guide (10580-00447).
• For real-time spectrum analyzer measurement setup, refer to RTSA measurement guide (10580-00448)
• For optimal dynamic range, noise floor, and residual spurs, set the reference level to just above the peak signal level when performing 16-,10-, or 8-bit captures. Otherwise, high level spurs may be present.
• Turn on the preamp when the reference level is set to –40 dBm or lower. With signal levels at –40 dBm and preamp off, spurs may be –15 dB from the signal level with 8-bit captures.
Note
When capturing IQ data from spectrum analyzer mode, the analyzer stops sweeping to start the capture. When the span is wider than the capture bandwidth or the RBW is very narrow, the LO will have to be tuned to the center frequency before the capture starts.
Once your basic measurement is configured, access the IQ CAPTURE menu from the main MEASURE menu. Refer to the measurement guide for the measurement mode you are using for information about using the menus.