278 Chapter4
Key Function Descriptions
Key Descriptions
SIG ID AT MKR For firmware revisions ≤920528 or for Option 008 only.
Activates a signal-identification function that locates
the frequency and harmonic number of the mixer
response. Place a marker on the desired signal, then
activate SIG ID AT MKR. The frequency of the signal
and the LO harmonic mixing number appear in the
active function block. If the function cannot identify the
signal, either one of two messages, NOT FOUND or LOST
SIGNAL, is displayed in the active function block.
If the analyzer traces are in states other than
clear-write, then no action takes place and the message
ACTIVATE TRACE appears.
Front-panel key access:
AUX CTRL
SIG ID ON OFF For firmware revisions ≤920528 or for Option 008 only.
Switches the manual signal-identification function ON
and OFF. When ON, this function employs a
frequency-shift method of identifying signals.
Displayed signals are shifted horizontally and
vertically on alternate sweeps. Signals that are correct
for the selected harmonic band are shifted less than 50
kHz. In addition, all signals are shifted downward in
amplitude by approximately one division, regardless of
scale. This routine is only effective for signal
identification in certain spans; the user must ensure
that a proper span is selected. (To ensure accuracy,
limit the frequency span to less than 20 MHz.)
Front-panel key access:
AUX CTRL
SIG TRK ON OFF Not available when a tracking generator is
active.Turns the signal-tracking function ON or OFF.
The signal-track function keeps the active marker on
the peak of the signal where it has been initially placed,
and sets the center frequency to its value. This is done
after every sweep, thus maintaining the marked signal
at the center frequency. This allows you to "zoom in"
quickly from a wide span to a narrow one without
losing the signal from the screen. Or, use SIG TRK ON
OFF to keep a slowly drifting signal centered on the
display. When this function is active, a K appears on the
left edge of the display.
Front-panel key access:
MKR
SIGNAL ID ENT For firmware revisions ≤920528 or for Option 008 only.
Displays a menu of signal-identification functions for
use with unpreselected external mixers.
Front-panel key access:
AUX CTRL
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