Operation
Horizontal
The A-Sweep
is
the only horizontal function
you
need
for most applications. The A
SWP indicator
is
on
when
the A-Sweep
is
displayed. To make sure the A-Sweep
is
displayed, press AUTO Setup and push SEC/DIV
in.
You
can also restore the A-
Sweep display by pushing the SEC/DIV knob
in
and turning it counterclockwise until
the A
SWP indicator lights. If both A SWP and B SWP indicators
are
off, push
SEC/DIV
in
and
turn it clockwise to escape the X/Y display mode.
The
X1
0 MAGnifier expands the center of the unmagnified waveform.
For best measurement accuracy, set
SEC/DIV for the fastest sweep that will
display the interval of interest and set
VAR
fully clockwise.
See
"Delayed Sweep Operation" for more information about B-Sweep, B-Trigger,
and
trace separation.
Trigger Controls
For "hands-off" triggering with most signals, select Auto
Lvi
Mode, Vert Source,
DC
Coupling,
and
MINimum Holdoff.
2-4
Auto Lvi mode, with LEVEL
in
the center half
of
its range, sets the trigger
pOint
near the midpoint between signal peaks.
When
LEVEL
is
set to the - or +
end
of its range, this mode initiates triggering near the 10% or 90% point between
signal peaks.
You
can select a level anywhere
in
about the middle 80% of the
signal amplitude. Once set, the level doesn't change unless the signal ceases to
trigger the sweep. The sweep free-runs without a trigger
signal. With signals
below
50
Hz,
AUTO L VL may not find the correct level.
With Auto
Lvi
mode
and
Vert Source, the displayed channel or the first one
of
a
multichannel display supplies the trigger signal.
Auto mode maintains the trigger level setting
and
the sweep free-runs if the
signal doesn't meet the triggering requirements.
Use
Auto for monitoring logic signals. Set the LEVEL control to the mean
threshold of the logic system, + 1.4 V for TTL. The sweep then triggers
on
valid
transitions
and
free-runs to show static highs
and
lows.
2465A/2455A/2445A Operators
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