Keysight N9915-90020 User’s Guide 311
IQ Analyzer (IQA) – Option 351
I/Q Analyzer (IQA) Mode Settings
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).
Manually set Scale, Unit, Acquisition, and Reference Position.
— Autoscale Automatically adjusts the Y-axis to comfortably fit the Minimum
and Maximum amplitude of the trace on the screen. Also, optimizes the
FieldFox’s signal level at the mixer and adjusts the reference level to with
the autoscale settings.
— Scale/Div Manually adjust the scale per division to view specific areas of
the current trace. Enter a value using the numeric keypad, the arrows,
or the rotary knob. Then press Enter
.
—
Ref Level Manually set the value of the reference line. Enter a negative
value by pressing Run/Hold (+/-)
either before or after typing a value. Use
acquisition in combination with the RF attenuator and the Preamp so that
the signal at the acquisition is at the optimum level for the FieldFox
(Spectrum and RF Envelope Only). This can also change the RF Attenuation
setting (default: 0). See
“Attenuation Control” on page 312.
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