Tektronix 2246 User Manual

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(33)
A/B
SELECT
Button—Directs
the
MODE,
SOURCE,
Pe use
ATIME measurement mode is active. Sets the width
of the intensified zone for: GATED CH1/CH2
VOLTMETER measurements.
‘NOTE
The delta cursor may be positioned to the end of the
A trace; however, the delta delay time has a range
of only ten times the A SEC/DIV setting (10 divi-
sions).
When maximum delta delay has been
reached,
increasing
the
main
delay
time
reduces
the
spacing
between
the
two
delays
and
they
do
not
track
together
(delta
delay
cannot
be
increased).
G1)
UNCAL—¥Indicates
that
the
A
AND
B
SEC/DIV
VAR
control
is
out
of
the
calibrated
detent
position
when
lighted.
TRACE
SEP
Control—Positions
the
B
Sweep
trace
vertically
with
respect
to
the
A
Sweep
trace
when
ALT
Horizontal
MODE
is
selected.
TRIGGER
See Figure 3-5 for items 33 through 39.
CPLG,
SLOPE,
and
LEVEL
controls
and
Trigger
LED
indicators
(TRIG’D
and
READY)
to
either
the
A
Trigger
system
or
the
B
Trigger
system.
The
A/B
SELECT
button
light
is
on
for
the
A
Trigger
and
off
for
the
B
Trigger.
When
switching
Horizontal
MODES,
the
A/B
SELECT
choice
is
initialized
for
the
MODE
switched
to:
A
Trigger
when
selecting
A
Hor-
izontal
MODE
and
B
Trigger
when
selecting
ALT
or
B
Horizontal
MODE.
No
change
occurs
when
switch-
ing
to
X-Y
Horizontal
MODE.
SLOPE
Button—Selects
the
slope
of
the
trigger
source
signal
that
triggers
either
the
A
Sweep
or
the
B
Sweep.
The
sweep
to
which
the
trigger
controls
are
directed
by
the
A/B
SELECT
switch
is
triggered
from
the
positive-going
slope
of
the
trigger
signal
when
the
SLOPE
button
light
is
on.
When
the
SLOPE
button
light
is
off,
the
sweep
is
triggered
from
the
negative-
going
slope
of
the
trigger
signal.
HOLDOFF
Control—Varies
the
amount
of
holdoff
time
between
the
end
of
one
A
Sweep
and
the
start
of
the
next
A
Sweep.
Controls,
Connectors,
and
Indicators—-2246
Operators
©
Full
clockwise
rotation
of
the
HOLDOFF
control
increases
the
holdoff
time
by
at
least
a
factor
of
ten:
full
counterclockwise
rotation
produces
minimum
holdoff
time.
Use
this
control
as
an
aid
in
obtaining
Stable
triggering
on
aperiodic
signals
(such
as
com-
plex
digital
waveforms).
LEVEL
Controi—-Sets
the
amplitude
point
on
the
trigger
signal
at
which
either
the
A
Sweep
or
the
B
Sweep
(as
directed
by
the
A/B
SELECT
button)
is
triggered.
When
the
TRIGGER
MODE
is
set
to
AUTO
LEVEL,
adjusting
the
trigger
level
setting
to
either
end
of
the
control
range
causes
the
auto
level
trigger
to
be
recalculated
so
that
the
LEVEL
control
range
is
lim-
ited
to
the
peak-to-peak
amplitude
of
the
trigger
source
signal.
MODE
Buttons
(Up-Arrow
and
Down-Arrow)
and
Indicators—
Select
and
indicate
the
operating
mode
of
the
A
and
B
trigger
systerns.
The
Up/Down
MODE
buttons
are
used
to
select
the
trigger
system
operating
mode
from
the
choices
of
AUTO
LEVEL,
AUTO,
NORM,
TV
LINE,
TV
FIELD,
and
SGL
SEQ
for
the
A
Trigger
system
and
AUTO
LEVEL,
RUNS
AFTER,
NORM,
TV
LINE
FROM
A
SOURCE
for
the
B
Trigger
system
as
directed
by
the
A/B
SELECT
button.
The
TRIGGER
MODE
front-panel
lights
indicate
the
selected
mode
of
operation
for
the
A
and
the
B
trigger
system.
A TRIGGER MODES
AUTO
LEVEL—Automatically
sets
the
range
of
the
Trigger
LEVEL
control
to
the
peak-to-peak
limits
of
the
signal
selected
as
the
A
Trigger
source
if
that
signals
amplitude
and
repetition
rate
are
adequate.
This
mode
is
very
useful
for
quickly
locating
the
Trigger
LEVEL
setting
for
stable
triggering.
The
A
Sweep
free
runs
if
the
trigger
source
signal
amplitude
is
too
low
or
if
the
repetition
rate
of
the
applied
signal
is
too
slow.
An
amplitude
change
of
the
triggering
signal
does
not
cause
a
reacquisi-
tion
of
the
peak-to-peak
signal
limits
unless
triggering
is
lost
at
the
set
level.
See
VERT
Trigger
MODE
for
related
information
regarding
the
Trigger
Signal
SOURCE
selection.
The
signal
trigger
level
is
reacquired
in
the
follow-
ing
conditions:
whenever
triggering
is
lost,
when
the
TRIGGER
LEVEL
control
is
rotated
to
either
end
stop,
and
if
the
AUTO
LEVEL
mode
is
3-7

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English