Tektronix 7834

DESCRIPTION
Vertical signals to be displayed on the crt are applied to the
Vertical Interface circuit from both vertical plug-in compart-
ments .
The
VERTICAL
MODE
switch determines whether
the signals from the LEFT VERT or RIGHT VERT com-
partments
are displayed on the crt . The selected vertical
signal(s) are amplified
by
the Vertical Amplifier
circuits to
bring them to the level necessary to drive the vertical
deflection plates of the crt (cathode-ray tube) . The Vertical
Amplifier
circuit also includes an input from the Readout
System
to produce the vertical portion of the alphanumeric
readout display .
Horizontal signals for display on the crt are connected to
the Horizontal Interface circuit from both horizontal plug-
in compartments . - The HORIZONTAL MODE switch deter-
mines whether the signals from the A HORIZ
or
B HORIZ
units are displayed by the crt . The selected horizontal
signal(s) are amplified by the Horizontal Amplifier circuit
to provide horizontal deflection of the crt . The Horizontal
Amplifier circuit also accepts an input signal from the Read-
out System to produce the horizontal portion of the alpha-
numeric readout display .
The
Readout System provides an alphanumeric display of
information encoded by the plug-in units . The readout
display is written on the crt on a time-shared basis with the
analog waveform display . The Mode Switch circuits deter-
mine which plug-in units display readout information .
The internal trigger
signals from the vertical plug-in units
are connected
to
the Trigger
Selector circuits . The Mode
Switch and
jr
rigger Selector circuits direct trigger signals
from the LEFT VERT or RIGHT VERT units
to
the A
HORIZ or B HORIZ units .
THEORY OF OP RIOT
BLOCK DIAGRAM
N
Section 3-7834
This section describes the circuitry used in the 7834 Storage
Oscilloscope . The description begins with a discussion of the
instrument, using the block diagram shown in Figure 3-1 . Next,
each circuit is described in detail with supporting illustrations,
when appropriate, to show the relationship between the stages in each major circuit
. Detailed schematics of each circuit
are
located in the Diagrams section at the rear of this manual . Refer to these schematics throughout
the
following
circuit
descrip-
tion for specific electrical values and relationships .
The following discussion is provided to aid in understanding the overall concept of the 7834 before the individual circuits are
discussed in detail . A basic block diagram of the 7834 is shown in Figure 3-1 . Only the basic interconnections between the
individual blocks are shown on this diagram . Each major circuit within the instrument
is
given
a block
. The number
of
each
block refers to the complete circuit diagram located at the rear of this manual .
The Logic circuit develops control signals for use in other
circuits within this instrument and the plug-in units . These
control signals automatically determine the correct instru-
ment operation in relation to the plug-in units, plug-in unit
control settings, and the 7834 control settings .
The CRT Circuit contains the control circuits necessary for
operation of the crt . The Z-Axis Amplifier provides the
drive signal to control the intensity level of the crt display .
The
Calibrator circuit produces a 1 kilohertz square-wave
signal which can be used
to
check the
calibration of
this
instrument and the compensation of probes . The calibrator
signal is available as a voltage
at
the
CALIBRATOR
con-
nector
or
as
a
current
through a 40
milliampere
optional
current loop accessory .
The Output Signals circuit process signals from the plug-in
units for rear-panel output .
The Storage Display and Storage Control circuits produce
the timing signals and control voltages required to operate
the storage functions of the crt .
The Converter/Rectifiers and Low-Voltage Regulator cir-
cuits provide the power necessary to operate this instru-
ment
. These voltages are connected to all circuits within the
instrument
.
The CRT
Circuit contains a high-voltage power
supply that provides accelerating
potential
for
the crt .