Agilent Technologies ESA Series User's/Programmer's Reference page 104

Front-Panel Key Reference
Input/Output
Signal Ident
On Off
Segmented sweep is not available when
NOTE
If the input signal is too broad band or unstable for the identification
NOTE
process to properly identify it, turn off the signal identification and look
for two similar responses separated by approximately 642.8 MHz (twice
the 321.4 MHz first IF). If a "–" mixer mode (for example: 8–) is active,
the right member of the response pair is the correct response; if a "+"
mixer mode is active, the left member of the response pair is the correct
response.
Signal ID
Mode
104
Activates a signal identification algorithm when
is selected, that either removes or aids
Signal Ident (On)
with the identification of multiple and image responses
of true input signals. Multiple and image responses
maybe generated when using unpreselected external
mixers.
Key Access:
Input/Output
The amplitude accuracy of the analyzer is degraded
when signal identification is active, and the message
Signal Ident On, Amptd Uncal will appear on the
display.
Allows you to select either of the following types of
signal identification methods:
Key Access:
Input/Output
Selects a signal identification mode
Image Suppress
that attempts to suppress all but valid
responses by mathematically removing
all image and multiple responses of
signals present at the mixer input. The
analyzer internally acquires the data in
a two sweep sequence, operates on the
acquired data, and displays the result
in Trace 1. Since two measurements are
taken for each display cycle, the display
update rate is reduced.
Key Access:
Signal ID Mode
Allows the analyzer, in a two sweep
Image Shift
sequence, to place data from the first
sweep in Trace 1, and data from the
second (frequency shifted) sweep in
Trace 2. Signal responses of Trace 1 and
,
Input Mixer
is selected.
Signal Ident (On)
,
Input Mixer
,
Input Mixer
Input/Output
,
Chapter 2