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(POS/NEG)
- Permits
"window"
triggering,
i.e.
triggering
on either
a positive-
or negative-going
signal
edge,
whichever
occurs
first.
When the
POS/NEG trigger
slope
is
selected,
the
Trigger
LEVEL
control
(33)
is
turned
counter-clOckwise
for
bi-slope
triggering
at
base
line
level.
Turning
the
Trigger
LEVEL control
(33)
clockwise
generates
a variable
amplitude
trigger
window
which
is
symmetrical
with
respect
to
the
center
of
the
screen
(internal
trigger
source)
and
to
ground
(external
trigger
source).
When
using
an
internal
trigger
source,
the
user
may produce
an
asymmetrical
window
by offsetting
the
base
line
with
respect
to
ground
via
Vertical
OFFSET control
(32).
In the window triggering
mode no trigger will occur while the
signal remains
within
the window.
A signal which exceeds
the
pre-selected
limits will generate
a trigger and the signal is
stored into the memory, as shown in the following figure.
Parml
STATUS
¯
M
WINDOW TRIGGERING
Figure 5.4
In
the above figure the trigger level is ± 3 divisions as indicated in
the Abridged Panel Status field.
Manual Operation
5-8
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