206 Chapter 2
Front-Panel Key Reference
System (Local)
All but RF Turns on the automatic alignment of all
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
Auto Align, All but RF
is selected, “
AB” appears along the left
edge of the display.
Key Access:
System, Alignments
Off
Turns off automatic alignment.
Key Access:
System, Alignments
NOTE It is normal to hear clicking sounds when the Auto Alignment function
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
System, Alignments, Auto Align, Off.
When this is done, the
Align Now, All function should be performed
periodically. Refer to the appropriate “Specifications and
Characteristics” chapter of your Specifications Guide for more
information on how often to perform
Align Now, All when the auto
alignment is off
Align Now Accesses the Align Now menu keys and immediately
executes an alignment cycle of the selected system(s).
Menu key selections include:
Key Access:
System, Alignments
All Initiates the alignment of all systems.
Except the Option 1DN Tracking
Generator for models E4402B, E4403B,
E4404B, E4405B, E4407B, and
E4408B.
Key Access:
System, Alignments, Align
Now
RF
(Ext Cable)
Initiates the alignment of the RF
system with a cable connected from
AMPTD REF OUT to INPUT 50 Ω.
Models E4402B, E4403B, E4404B,
E4405B, E4407B, and E4408B.
Key Access:
System, Alignments, Align
Now
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