Chapter 11 199
Service and Diagnostics Menus
Service Key Descriptions
LO
Immediately executes an alignment of the LO subsystem. The instrument
will stop any measurement currently underway, perform the alignment, then
restart the measurement from the beginning.
A failure of LO will set the Error Condition “Align LO failed”. A failure
will not employ new LO alignment data.
Successful completion of LO will clear the Error Condition “Align LO
failed”.
The Advisory Event “Alignment complete” is displayed when the
alignment is complete.
Align LO can be interrupted by pressing the Cancel (ESC) front-panel key.
When this occurs, no new LO alignment data will be employed.
IF
Immediately executes an alignment of the IF subsystem. The instrument
will stop any measurement currently underway, perform the alignment, then
restart the measurement from the beginning.
A failure of IF will set the Error Condition “Align IF failed”. A failure will
not employ new IF alignment data.
Successful completion of IF will clear the Error Condition “Align IF failed”
and clear bit 6 in the Status.
The Advisory Event “Alignment complete” is displayed when the
alignment is complete.
Align IF can be interrupted by pressing the Cancel (ESC) front-panel key.
When this occurs, no new IF alignment data will be employed.
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 Gain System
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.
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