Keysight Technologies Option 503 Service Manual page 360

Service and Diagnostics Menus
Service Key Descriptions
360
RF
This is exactly the same as the customer accessible Align Now, RF
with one exception: the alignment can be invoked even if a previous
Align Now, All has not been executed (this key is not grayed-out if
using default alignment data). See description of Align Now, RF in the
User's Guide.
Current System Gain
Immediately executes an alignment of the Current System Gain, for
the purpose of improving small amplitude variations that occur as
resolution bandwidth is switched. This alignment is done by
measuring the response of the current system state configuration to
the 50 MHz amplitude reference signal. All subsequent
measurements are then compensated appropriately for absolute
amplitude accuracy. The instrument will stop any measurement
currently underway, perform the alignment, then restart the
measurement from the beginning.
The Advisory Event "Alignment complete" is displayed when the
alignment is complete.
Align Current System Gain can be interrupted by pressing the Cancel
(ESC) front-panel key. When this occurs, no new Current System
Gain alignment data will be employed.
LO Phase Noise Ad justment
Immediately executes an optimization for LO Phase Noise. When the
optimization is finished the value is stored in non-volatile memory.
The instrument will stop any measurement currently underway,
perform the alignment, and then restart the measurement from the
beginning (similar to pressing the Restart key).
Nulling
The hardware is capable of nulling (canceling) the LO Feedthru,
intermodulation products, or neither. It is physically not capable of
nulling both at the same time.
LO Feed thru Nulling
Control is available to set the state of LO Feedthru nulling ON or OFF.
In the ON state, the software will determine when it is appropriate to
null the LO Feedthru. LO nulling is only available in low band.
Intermod Nulling
Control is available to set the state of Intermod Nulling On or OFF. In
the ON state, the software will determine when it is appropriate to
null the intermodulation products. IM nulling is only available in low
band.
N9030A PXA Signal Analyzer Service Guide