Tektronix 7834

Figure 2-4 . Location of readout on the crt identifying
the originating
plug-in
and channel .
The readout information from each channel of
each plug-in
unit
is
called a word . Up to eight words of readout
infor-
mation
can be displayed on the crt (two channels from
each
of the
four plug-in compartments) . The location of each
readout
word is fixed and is directly related to
the plug-in
unit
and channel from which it originated . Figure 2-4
shows
the area
of the graticule where the readout from each
plug-
in unit
and/or channel is displayed . Notice that
the readout
from channel 1 of each plug-in unit is displayed in
the top
division
of the graticule and the readout from channel
2 is
displayed directly
below in the bottom division of the
graticule
. The REDUCED SCAN mode changes the location
of
the readout display . Figure 2-5 shows
the correct
readout location for the REDUCED SCAN
mode . Notice
that the readout display is positioned
outside the half-size
inner graticule and that the location of
the readout words is
directly related to the
plug-in unit and channel from which
they
originated . Usually, the readout information
for plug--
in units and/or channels, which are selected by
the mode
switches,
appear in the readout display . (Some special
purpose plug-in units may over-ride the mode
switches to
display readout even though the
compartment is not
selected for display
.)
READOUT IDENTIFY
. An "Identify" feature is provided
by the Readout System to
correlate the readout word with
the originating
plug-in unit and channel (amplifier units
only) . When
the "identify" button of an amplifier unit is
pressed, the word IDENTIFY appears in the readout location
allocated to that plug-in and channel . Other readout words
1987-4
LEFT VERT

_
RIGHT VERT

A HORIZ

B HORIZ
CHANNEL1 CHANNEL1
CHANNEL1 CHANNEL1
Operating Instructions--7834
LEFT VERT

RIGHT VERT

A
HORIZ

B
HORIZ
CHANNEL2
CHANNEL2
CHANNEL2 CHANNEL2
1987-5
Figure 2-5 . Location of
readout on the crt when REDUCED
SCAN
is selected .
in the display
remain unchanged . When the "identify"
button is released, the
readout display from this plug-in
channel is again displayed .
Circuitry may also be provided
in the amplifier unit to
produce a noticeable change in the
analog waveform display to
identify the associated trace
when the "identify"
button is pressed (see the plug-in unit
instruction manual for details) .
READOUT INTENSITY .
The READOUT control deter-
mines the intensity of only the readout
portion of the
display, independently of the
other traces . The Readout
System is inoperative when
the READOUT control is in the
fully counterclockwise OFF
position . This may be desirable
when the top and bottom
divisions
of
the graticule are to
be used for
waveform display, or when the trace inter-
ruptions necessary to display characters interfere
with the
waveform display .
READOUT MODES . The
READOUT GATED or FREE
RUN switch
determines the operating mode of the Readout
System
. With the READOUT GATED or FREE
RUN
switch set to FREE RUN, the Readout System operates
continuously, interrupting the usual crt display at random
(for about
20
microseconds) in order to write each character
on the crt . With the READOUT GATED or
FREE RUN
switch set to the GATED position, the
Readout System
operates in a triggered mode ; one complete
frame (up to
eight words) of readout is displayed after the
displayed
time-base unit completes each sweep of the crt .