256 Keysight N9927-90001 User’s Guide
IQ Analyzer (IQA) – Option 351 (CPU2 Only)
Using Markers (IQA)
Using Markers (IQA)
The markers described here are for I/Q Analyzer mode (exceptions are noted).
For additional marker features, refer to “All about Markers” on page 484.
This section contains the following:
Noise Marker
For comparison purposes, electronic noise measurements are often displayed
as though the measurement was made in a 1 Hz Res BW. However, making an
actual measurement at a 1 Hz Res BW is extremely slow.
A Noise Marker mathematically calculates the noise measurement as though it
were made using a 1 Hz bandwidth.
Several data points are averaged together to calculate the Noise Marker
readout. To accurately measure noise, the Noise Marker should NOT be placed
on, or too close to, a signal. The distance from a signal depends on several
factors. To know if an accurate reading is being made, move the Noise Marker
until consistent measurements are displayed in adjacent data points.
With a Noise Marker present, the Res BW can be changed and the displayed
noise floor will also change, but the Noise Marker readout will remain about
the same.
IMPORTANT! When using I/Q markers, it is important to either be in Single
acquisition mode or for Continuous acquisition mode, to set the
measurement in advance on the FieldFox to Waveform or to Spectrum.
Refer to “How to Make Measurements Using the I/Q Analyzer Mode” on
page 241.
The spectrum measurement’s six markers can only be applied to a single
displayed set of traces (Magnitude Spectrum).
The waveform measurement’s six markers can be applied to any of the six
displayed parameter traces (RF Envelope, I (Imaginary), Q (Real), Phase,
Unwrapped Phase, or Polar).
See also “Trace Display States (IQA Mode)” on page 261.
“Noise Marker” on page 256
“Band/Interval Power Marker” on page 257
“Band Span Marker (Spectrum Only)” on page 258
“Interval Span Marker (Waveform Only)” on page 258
“Coupled Markers (Waveform Only)” on page 258
“Continuous Peak Search Marker” on page 260
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