Tektronix 2247A

Controls, Connectors, and Indicators
Vertical
Refer to Figure 2-2 for location of items 10 through 17.
CH 1 and CH 2 POSITION Controls—Adjust vertical position of the
Channel 1 and Channel 2 waveform displays.
(1) MODE Buttons—Select the vertical channels for display (CH 1, ADD
channels 1 and 2, CH 2, CH 3, and CH 4). The CHOP/ALT MODE
button selects method for switching input channels on the display
— (chopped or alternating) .
Except for CHOP/ALT modes, pressing an unlit mode button turns on
the
mode, and pressing a lit button turns off the mode. CHOP is
selected when the CHOP/ALT button Is lit; ALT is selected when the
button Is not lit.
CH 1, CH 2, CH 3, and CH 4—Select vertical channels for display.
At least one of the channels or ADD Is always on and cannot be turned
off until another channel Is first turned on.
CHOP/ALT—In the CHOP mode the display chops between selected
I
Input
channels
at
a
rate
of
about
625
kHz.
In
the
ALT
mode,
the
selected
channels
are
displayed
in
sequence
(alternating
at
the
end
of
=
each
sweep).
=
AOD—Displays
the
algebraic
sum
of
the
Channel
1
and
Channel
2
Input
signals.
The
ADD
display
is
In
addition
to
any
other
selected
.
channel
displays.
In
the
ADD
mode,
a
plus
sign
(+)
is
displayed
between
the
Channel
1
and
Channel
2
VOLTS/DIV
readouts.
=
|
NOTE
"
In
ADD
mode
when
AUTO
LEVEL
TRIGGER
MODE
or
ed
CHOP
VERTICAL
MODE
Is
selected,
the
algebraic
sum
of
Channel
1
and
Channel
2
displays
provides
the
internal
sig-
>
nal
source
for
the
trigger
system
when
the
trigger
source
is
VERT.
2247A
Operators
2-3