312 Keysight N9915-90020 User’s Guide
IQ Analyzer (IQA) – Option 351
I/Q Analyzer (IQA) Mode Settings
— 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)
(default: 0, minimum: 0, maximum: 10).
—
More, then
— Unit Sets the display units.
Attenuation Control
Both the RF Attenuation and Preamp functions control the power level into
the FieldFox mixer.
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 receiver 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.
—
Auto RF Attenuation is set by adjusting the input power level. 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.
—
Man RF Attenuation is set manually. The default Attenuation setting is
15 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
#Atten xx dB is shown at the top of the screen. (#) means manual setting.
(Default: 15 dB, minimum: 0 dB, maximum: 40 dB.)
The FieldFox can be damaged with too much power. Refer to the FieldFox
Data Sheet for your model by referring to
Appendix B:,
“Specifications/Data Sheet,” on page 869
.
RF Damage Level: +27 dBm
DC Damage Level: ±50 VDC
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