Tektronix 2246 User Manual

Controls,
Connectors,
and
Indicators—
2246
Operators
READOUT
Control—Adjusts
brightness
of
the
crt
readout
display.
Brightness
is
increased
when
the
control
is
rotated
clockwise.
Full
counterclockwise
rotation
of
the
READOUT
control
turns
off
the
readout
circuitry
operation.
SCALE
ILLUM
Control—Adjusts
the
light
level
of
the
graticule
illumination.
NOTE
Maximum
life
of
the
graticule
illumination
lamps
is
gained
by
setting
the
SCALE
ILLUM
control
for
the
minimum
intensity
needed
for
viewing.
Turning
the
scale
illumination
lamps
down,
or
off
when
not
needed,
extends
the
life
many
times
over
using
max-
imum
intensity.
O
©
-BEAM FIND Button—Restricts the vertical and hor-
izontal display size to within the graticule area and
unblanks
the
crt
to
aid
the
user
in
locating
off-screen
or overscanned displays.
CRT—Displays the waveform and readout displays
in an 80 mm vertical by 100 mm horizontal graticule
area.
Internal
graticule
lines
eliminate
parallax-viewing
error
between
the
trace
and
graticule
lines.
0%,
10%,
90%
and
100%
points
are
marked
at
the
left
edge
of
the
graticule
as
a convenience
to
the
user
for
making
rise-
and
fall-time
measurements.
VERTICAL
See Figure 3-2 for items 10 through 17.
(10)
Channel
1
and
Channel
2
POSITION
Controls-—
Set
the
vertical
position
of
the
Channel
1
and
Channel
2
signal
displays.
Clockwise rotation of a control knob moves the
associated trace up; counterclockwise rotation
moves the trace down. In X-Y mode, the associated
POSITION control moves the display vertically.
‘MODE Buttons—Select the vertical channels for
display and CHOP or ALT and ADD Mode for
display of the selected channels.
The buttons will light to indicate the selection made
(except that for ALT Mode the CHOP/ALT button
light is off}. One channel will always be displayed.
When
only
one
channel
is
selected
for
display,
that
channel
cannot
be
turned
off.
CH
1,
CH
2,
CH
3,
and
CH
4
Buttons—Select
any
combination
of
the
vertical
channels
for
display
by
pressing
in
the
appropriate
MODE
but-
tons.
Pressing
the
button
of
a
displayed
channel
(button
lighted)
removes
that
channel's
trace
from
the
display.
CHOP/ALT
Button—Chops
between
the
selected
input
channels
at
a
chopping
frequency
of
approximately
625
kHz
when
the
button
is
lighted
(CHOP
Mode);
displays
each
selected
channel
in
sequence
when
the
button
light
is
off
(ALT
Mode).
ADD
Button—Displays
the
algebraic
sum
of
the
Channel
1
and
Channel
2
input
signals
when
the
ADD
button
light
is
on.
The
ADD
display
is
in
addition
to
any
other
selected
channel
displays.
A
plus
sign
(+)
appears
on
the
readout
between
the
Channel
1
and
Channel
2
VOLTS/DIV
switch
settings
when
ADD
mode
is
on.
Press
the
ADD
button
a
second
time
to
turn
off
the
ADD
button
light
and
remove
the
ADD
trace
from
the
display.
NOTE
In
ADD
mode,
the
algebraic
sum
of
Channel
1
and
Channel
2
display
is
the
only
signal
source
for
the
trigger
system
when
either
AUTO
LEVEL
TRIGGER
MODE
or
CHOP
VERTICAL
MODE
is
selected.
Channel
1
and
Channel
2
VOLTS/DIV
Switches—
Select
the
calibrated
deflection
settings
for
Channel
1
and
Channel
2
from
2
mV
per
division
to
5
V
per
division
in
a
1-2-5
sequence
of
11
steps.
The
switches
are
detented,
continuous-rotation
con-
trols
with
no
end
stops.
The
VOLTS/DIV
switch
set-
ting
displayed
in
the
crt
readout
reflects
the
attenua-
tion
factor
of
coded
attenuator
probes
that
are
con-
nected
to
the
vertical
inputs.
VOLTS/DIV
VAR
Controis—Provide
for
adjustable
vertical
deflection
between
the
calibrated
settings
of
the
Channel
1
and
Channel
2
VOLTS/DIV
switches.
The
controls
vary
the
deflection
factors
from
cali-
brated
(fully
clockwise
detent
position)
to
at
least
2.5
times
the
calibrated
deflection
factor
(fully
counter-
clockwise
position).
When
a
VAR
control
is
out
of
its
detent
position,
a
greater
than
(>)
sign
appears
on
the
left
side
of
the
associated
VOLTS/DIV
readout
display
to
indicate
a
deflection
factor
greater
than
the
VOLTS/DIV
switch
setting.
REV OCT 1986
a Toa et a Fi
Fe TA ma
3
L

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English