Keysight N9927-90001 User’s Guide 273
IQ Analyzer (IQA) – Option 351 (CPU2 Only)
I/Q Analyzer (IQA) Mode Settings
— Freq Span (Spectrum Only) Sets the frequency span of the
measurement trace. The analyzer's digital IF bandwidth is always
equal to this value.
Changing the span causes the IF bandwidth and the sample rate to
change automatically:
Span = IF bandwidth, sample rate = 1.25 * IF bandwidth
Res BW = Span /50, if resolution bandwidth = Auto.
Default: 10 MHz, minimum: 10 Hz, maximum: 10 MHz
Adjusting the Scale and Amplitude Settings
Enables you to change attenuation settings. When RF Attenuation Auto is ON,
the RF Attenuation is set by adjusting the acquisition. As the acquisition is
lowered, for example from -10 dBm to -30 dBm, the FieldFox assumes that you
are looking at low-level signals. The RF Attenuation value is automatically
lowered in 5 dB steps to allow low-level signals to be viewed. The RF
Attenuation value is never automatically lowered below 5 dB.
How to set Scale/Amptd
—Press Scale/Amptd.
Manually set Log or Linear Scale Type (Spectrum and RF Envelope Only)
Then select from the following:
— More
——Scale Type [current setting]
(Spectrum and RF Envelope)
—Only)
——Log
Logarithmic scale (default setting). The Y-axis
reference line represents the specified absolute
acquisition in the current Unit selection. Y-axis
graticules show dB below or above the reference line
(default: 10 dB, minimum: 0.01 dB, maximum: 20 dB).
——Lin
Linear scale. The Y-axis reference line represents the
specified absolute acquisition in the current Unit
selection.
——Y-axis graticules show percent of acquisition (%)
below or above the reference line (Spectrum).
——Y-axis graticules show voltage (V) – (RF
Envelope).
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