160 Keysight N9915-90020 User’s Guide
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
— PSD Function Enables/disables the Power Spectral Density Function (PSD
Function) which is a way to normalize the SA measurement to a 1 Hz
Bandwidth. (Default == OFF). Learn more, see
“Power Spectral Density
(PSD) Function (SA Mode Only)” on page 216
.
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
“Manage Files” on
page 826
.
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
1. Press Scale/Amptd.
2. Then
More
3. Then External Gain
4. Enter a value using the numeric keypad, the arrows, or the rotary
knob (positive for gain; negative for loss). Values less than 5 dB must be
typed using the numeric keypad. Then press Enter
ExtGain xx dB is shown at the top of the screen.
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