Tektronix 2246 User Manual

Controls,
Connectors,
and
Indicators—
2246
Operators
Tektronix 2246
Figure
3-5.
Trigger
Controls
and
indicators.
reselected.
The
trigger
selected
by
the
A/B
SELECT
button
is
the
trigger
signal
that
is
reac-
quired,
except
when
triggering
is
lost.
In
that
case,
reacquiring
the
A
Trigger
has
priority
over
the
B
Trigger.
The
trigger
level
remains
as
set
when
switching
to
AUTO
or
NORM
TRIGGER
MODE
until
the
TRIGGER
LEVEL
control
is
rotated.
AUTO—Triggers
as
in
NORM
Trigger
MODE
when
an
adequate
trigger
signal
is
applied.
The
A
Sweep
begins
free-running
for
an
auto
baseline
in
the
absence
of
a
triggering
signal!
or
when
the
repetition
rate
of
the
trigger
signal
is
too
low
(see
Table
3-1
for
critical
triggering
inter-
vals).
The
set
triggering
level
changes
only
when
the
TRIGGER
LEVEL
control
is
adjusted
to
a
new
level
setting.
NORM
—Initiates
the
A
Sweep
when
an
adequate
trigger
signal
is
applied.
In
the
absence
of
a
trigger
signal,
a
sweep
is
not
generated
(no
base-
line
trace
is
displayed).
TV
LINE—Starts
the
A
Sweep
at
the
beginning
of
a
video
signal
line.
SLOPE
polarity
must
match
Table 3-1
Auto Triggering Intervals
SEC/DIV
Critical
Trigger
Setting
Interval
5
ms/div
and
faster
20
ms
10
ms/div
40
ms
20
ms/div
160
ms
50
ms/div
and
slower
400
ms
the
composite
sync
polarity
to
obtain
TV
LINE
triggering
on
the
horizontal
sync
pulse.
TV
FIELD—Starts
the
A
Sweep
at
the
beginning
of
a
video
signal
field.
SLOPE
polarity
must
match
the
composite
sync
polarity
to
obtain
TV
FIELD
triggering.
SGL
SEQ
(Single
Sequence)—Arms
the
A
Sweep
for
single-sequence
operation
when

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English