SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
—Then More
—Then External Gain
— 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.
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, ADC Over Range
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 RF Atten Auto Man
.
The FieldFox can be damaged with too much power. Refer to the FieldFox
Data Sheet for your model on
https://www.keysight.com/us/en/assets/7018-06516/data-sheets/5992-
3702.pdf.
Maximum Input Voltages and Power:
RF Output Connector: 50V DC, +23 dBm RF
Ext Trig/Ref Connector: 5.5 V DC
RF Input:
+27 dBm RF, ±50 VDC Max. (N991xA/B, N9925B, N9926A
,
N9928A, N993xA/B)
+23 dBm RF, ±50 VDC Max. (N9923A, N9923AN)
+25 dBm RF, ±40 VDC Max. (N995xA/B, N996xA/B)
DC Input: 19VDC, 4ADC, 60 Watts maximum when charging battery
Keysight N9938-90003 User's Guide
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