External Gain - Keysight B Series User Manual

SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
Manually set Scale, acquisition, and Reference Position.
— Press More, then
—
—
—
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
— Then choose from the following:
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.
116
—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.
Autoscale
fit the Minimum and Maximum amplitude of the trace on the screen.
Scale Manually adjust the scale per division to view specific areas of the
current trace. Enter a value using the numeric keypad, the
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. This
can also change the RF Attenuation setting. See
page 117.
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).
—dBm (default setting), dBmV (dB milli Volts), dBuV (dB microVolts), W
(watts), V (volts), A (amps), dBmA (dB milliAmps), dBuA (dB
microAmps).
Automatically adjusts the Y-axis to comfortably
"Attenuation Control" on
Unit
Keysight N9938-90003 User's Guide
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