Circuit Description
Front Panel
3-6
Vertical Output A3
<2>
The vertical output amplifier provides the final stage of amplification
of
the
vertical
signal. The output
of
the vertical amplifier
is
connected to the
CRT
vertical plates. Vertical time and frequency compensation networks, some
which are adjustable are
also contained
in
this circuit block. The compensa-
tion networks corrects for errors
in
the time response
of
the vertical delay-
line
and variations
in
time and frequency response of the total vertical sys-
tem. The vertical signal at the input of the vertical output stage
is
sampled
and feedback to the trigger circuitry on the
analog board. This feedback
vertical signal
is
used for purposes of calibration.
Horizontal Output A3
<&>
The horizontal output amplifier provides the final stage of amplification of the
horizontal
signal and drives the
CRT
horizontal plates directly. The input
signal from the analog board
is
current
in
and the output signal to the
CRT
is
a voltage.
High Voltage A3
~
This Circuitry provides the necessary static and dynamic levels to support
the
CRT biasing and Z-axis drive. The Z-axis amplifier provides amplification
of
the Z-axis signal from the analog board which
is
a current. The output of
•
the Z-axis amplifier is then applied
to
the
DC
restorer circuitry which level •
shifts this signal to the cathode level. A focus amplifier receives its input
signal from a user control on the front
panel. This enables the user the ability
to optimizes the CRT focus. Additional circuitry
is
provided
to
support the
necessary bias and operation
levels for the
CRT.
The External Z-Axis connector provides the ability to modulate the Z-axis
amplifier
circuit on the
A3
Display Driver board, thus modulating or blanking
the intensity
of
the
CRT
display.
Vertical Termination
(TAS
485 only) - The A10 Vertical Termination
hybrid provides the correct impedance for the vertical deflection plates
in
the
CRT.
The processor system sends and receives information
to
and from the
A4
Front Panel board. The Front Panel board reads the front-panel controls and
changes in their settings are reported to the processor system. The front-
panel processor turns the
LEOs
on and off, generates the probe compensa-
tion signal, and processes the probe coding interface signals.
Menu Switches
A4<9
Front-panel menu switches are read
by
the Front Panel board and changes
in menu selections are sent to the processor system.
Theory of Operation
•
To Next Page
Loading...
Need help?
General
