SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
—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.
—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.
— Unit
Refer to “How to Set Y-axis Units” on page 155.
— Corrections
Refer to “How to select and edit corrections for Field Strength
measurements” on page 158.
— External Gain
Refer to “External Gain” on page 155.
— Ref Pos
Manually set the position of the reference line. Values must be
between 0 (TOP line) and 10 (BOTTOM line). Default position is zero (top).
How to Set Y-axis Units
The Unit setting appears for the reference line, marker readouts, and trigger
level. All Unit choices are available in both Log and Linear Scale Types.
The UNIT setting survives Mode Preset, but NOT Preset.
—Press Scale / Amptd
, then More, then Unit
— Then choose from the following:
—dBm (default setting), dBmV (dB milli Volts), dBuV (dB microVolts), W
(watts), V (volts), A (amps), dBmA (dB milliAmps), dBuA (dB
microAmps).
Antenna correction units are available ONLY by loading or editing an Antenna
file that contains the desired units setting. Learn more In.
External Gain
When using an external amplifier or attenuator, the SA mode trace amplitude
values can be offset to compensate for the effect of the external device. This
effectively moves the reference plane of the SA measurement port out to just
beyond the external device. For example, when using an external preamp with
gain of +10 dB, enter this value for External Gain, and the data trace across the
displayed frequency span will be adjusted down by 10 dB.
When RF Atten is set to Auto, you may see a change in the RF Attenuation
value. This is an attempt to measure the signal at top of screen (the
acquisition) without overloading the SA first mixer.
How to Set External Gain
—Press Scale/Amptd.
Keysight N9938-90003 User's Guide
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