Agilent Technologies ESA Series User's/Programmer's Reference page 158

Front-Panel Key Reference
System (Local)
It is normal to hear clicking sounds when the Auto Alignment function
NOTE
is On. During retrace, a small portion of the analyzer circuitry is
realigned. Some of the switching of the analyzer circuitry is done using
relays. It is the rapid switching of these relays during retrace that
causes the clicking sounds. To eliminate the clicking sounds, turn the
auto alignment off by pressing
When this is done, the
periodically. Refer to the appropriate "Specifications and
Characteristics" chapter of your Specifications Guide for more
information on how often to perform
alignment is off
Align Now
158
Turns on the automatic alignment of all
All but RF
measurement systems except the RF
section. (Eliminating automatic
alignment of the RF prevents changes
in the input impedance between
sweeps, which could cause input device
instability.) When
is selected, "
edge of the display.
Key Access:
Turns off automatic alignment.
Off
Key Access:
System
, function should be performed
Align Now All
Align Now
Accesses the
Align Now
executes an alignment cycle of the selected system(s).
Menu key selections include:
Key Access: ,
System Alignments
Initiates the alignment of all systems.
All
Except the Option 1DN Tracking
Generator for models E4402B, E4403B,
E4404B, E4405B, E4407B, and
E4408B.
Key Access:
Now
RF
Initiates the alignment of the RF
(Ext Cable)
system with a cable connected from
AMPTD REF OUT to INPUT 50 Ω.
Models E4402B, E4403B, E4404B,
E4405B, E4407B, and E4408B.
Key Access:
Now
Auto Align
" appears along the left
AB
,
System Alignments
,
System Alignments
, ,
Alignments Auto Align
, when the auto
All
menu keys and immediately
,
System Alignments, Align
,
System Alignments, Align
,
All but RF
, .
Off
Chapter 2