A-Trigger Modes:
AUTO LVL
Controls, Connectors,
and
Indicators
Automatically establishes the trigger level
on
a
triggering
signal and free runs the sweep
in
the
absence of a triggering
signal.
In
Auto Lvi mode, LEVEL covers the range between
the positive and negative peaks of repetitive
triggering
signals. If the triggering signal amplitude
changes, the trigger level does not change unless a
trigger is no
longer produced at the established level.
The signal peaks are measured and the trigger level
is
redefined when triggering ceases, when the LEVEL
control
is turned
to
either extreme, or when the
upper
MODE button is pressed. If the LEVEL control
is
set near either end position, the trigger level
is
set
near the corresponding
signal peak. If LEVEL
is
in
the midrange between either end, the trigger level set
by
AUTO LVL is near the midpoint between the
trigger
signal peaks. When INIT@50% is pressed,
the trigger
level is set near the midpoint of the
Signal,
regardless
of
the setting
of
LEVEL. The established
trigger level remains
in
effect when switching to Auto
trigger mode.
To obtain triggered sweeps, the triggering
signal
repetition rate must be greater than a nominal limit,
depending on the selected sweep speed.
With Auto Lvi mode and
Vert trigger source, the
lowest numbered channel displayed, or Add if it
is
displayed, provides the trigger signal. When the
trigger mode
is
changed from Auto Lvi
to
Auto while
more than one
channel
is
displayed, the single
channel
trigger source
is
retained and the VERT
indicator
is
turned off unless Add is being displayed.
When Add
is
displayed, Vert source is retained when
trigger mode changes
to
Auto.
AUTO Sweep free runs
in
the absence of a triggering signal.
The trigger level changes only when the LEVEL
control
is
adjusted
to
a new position or when
INIT@50% is pressed.
2465A/2455A/2445A Operators 5-19
To Next Page
Loading...
Need help?
General
