Attenuation Control - Keysight B Series User Manual

SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
How to Set External Gain
— Press Scale/Amptd.
— Then
— Then
— Enter a value using the numeric keypad, the
ExtGain xx dB is shown at the top of the screen.

Attenuation Control

Both the RF Attenuation and Preamp functions control the power level into the
SA.
When too much power is present at the RF Input port,
appears on the FieldFox screen. This does not necessarily mean that damage
has occurred, but that the measurement is probably compressed.
When high power levels are present at the RF Input port, internal attenuation
can be switched in to keep the FieldFox receiver from compressing. At
extremely high power levels, use external attenuation to protect the internal
circuitry from being damaged.
The displayed power level is automatically adjusted for RF Attenuation. As the
attenuation value changes, the displayed power level should NOT change.
How to set Attenuation
— Press Scale/Amptd.
— Then
—
—
Keysight N9938-90003 User's Guide
More
External Gain
(positive for gain; negative for loss). Values less than 5 dB must be typed
using the numeric keypad. Then press Enter
The FieldFox can be damaged with too much power. Refer to the FieldFox
Data Sheet for your model on
http://literature.cdn.keysight.com/litweb/pdf/5992-3702EN.pdf.
RF Damage Level: +25 dBm (N995xB & N996xB) and +27 dBm (all others)
DC Damage Level: ±50 VDC
RF Atten Auto Man.
Auto RF Attenuation is set by adjusting the acquisition. As the acquisition is
lowered, for example from –10 dBm to –40 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.
Man RF Attenuation is set manually. The default Attenuation setting is
10 dB. Enter a value between 0 to 40 dB in 5 dB steps using the numeric
keypad, the arrows, or the rotary knob. Then press Enter
arrows, or the rotary knob
ADC Over Range
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