Vertical Binary - Tektronix 7140 Instruction Manual

Theory of Operation-7104
VERTICAL BINARY Pin 4 Horizontal Slave Enable LO-HORIZONTAL
The Vertical Binary stage produces the Vertical Alternate
MODE switch in any position except ALT or CHOP, or
Command, at pin 6 to determine which vertical unit is to
the A time-base unit is set for delayed sweep.
be displayed when the VERTICAL MODE switch is set for
ALT. When this output level is HI, the RIGHT VERT unit is Pin 10 HI-HORIZONTAL MODE switch set to A or B.
displayed; when it is LO, the LEFT VERT unit is displayed.
In the ALT or CHOP positions of the HORIZONTAL MODE
2, qLT OR CHOP MODE (HORIZ): NONDELAYED . In
switch (non-delayed operation only), the output of this
the ALT or CHOP positions of the HORIZONTAL MODE
stage is slaved to the output of the Horizontal Binary
sv itch, the output le vel at pin 6 is the sa me as the
stage so that the Vertical Alternate Command is always
pisplay B Command level at pin 7 . The Display B
HI when the Display B Command is LO, and vice versa.
Command level is produced by inverting the Display B
This action allows independent-pairs operation (sweep-
Command from the Horizontal Binary stage. Therefore,
slaving) in the ALT position of the VERTICAL MODE
the repetition rate of the output signal is the same as the
switch and the ALT or CHOP
positions of the
pisplay B Command. With the VERTICAL MODE switch
HORIZONTAL MODE switch, whereby the LEFT VERT
set to ALT and the A time-base unit set for nondelayed
unit is always displayed at the sweep rate of the B time-
operation, the result is that the RIGHT VERT unit is
base and the RIGHT VERT unit is displayed at the sweep
always displayed at the sweep rate of the A time-base
rate of the A time-base. Thus, independent-pairs
unit, and the LEFT VERT unit is always displayed at the
operation can simulate dual-beam operation for repetitive
s~n,eep rate of the B time-base unit (independent-pairs
sweeps .
operation or sweep slaving) . The input conditions to
provide a HI output level so that the RIGHT VERT unit can
When the A time-base unit is set to the delaying mode,
be displayed at the A sweep rate are:
the repetition rate of the Vertical Alternate command is
one-half the repetition rate of the Display B Command.
Pin 4 Horizontal Slave Enable HI-HORIZONTAL MODE
This results in each vertical unit being displayed first
switch set to ALT or CHOP with nondelayed sweep.
against the A time-base unit (delaying), then the B time-
base unit (delayed), before the display is switched to the
other vertical unit .
Pin 7 HI-The A sweep is to be displayed (Display B
Command LO) .
The Vertical Alternate Command is used in the Plug-In
Binary and Vertical Mode Logic stages . The Vertical
Pin 10 LO-HORIZONTAL MODE switch set to any
Binary stage (U4368) uses the same type of IC as the
Position except A or B .
Horizontal Binary stage. Notice the isp ay ommand
level at pin 7. This input is the inverse of the Display B
The input conditions to provide a LO output level so that
Command level at pin 8 (04364 generates the display B
the LEFT VERT unit can be displayed at the B-sweep rate
Command level) . Also, notice the line connected to pin 4
are:
of the Vertical Binary IC U4368. The level at pin 4 Horiz
Slave Enable is generated by 04424 and is HI only when
the HORIZONTAL MODE switch is set for ALT or CHOP Pin 4 Horizontal Slave Enable HI-HORIZONTAL MODE
and the time-base units are in nondelayed operation. The
switch set to ALT or CHOP with nondelayed sweep.
Vertical Binary IC uses the information at pin 4 for
correct slaving of the Vertical Alternate Command to the
Pin 7 LO-The B sweep is to be displayed (Display B
Display B Command (necessary for independent-pairs
Command HI).
operation) . Horizontal Slave Enable is also used by the
trigger select logic.
Pin 10 LO-HORIZONTAL MODE switch set to any
position except A or B.
The operation of the Vertical Binary stage in relation to
the modes of operation that can occur is described in the
following:
3 . ALT OR CHOP MODE (HORIZ) : DELAYED . If the A
time-base unit is set to the delayed mode when the
1 . A OR B MODE . When the HORIZONTAL MODE
HORIZONTAL MODE switch is set to either ALT or CHOP,
the operation of the stage is changed from that discussed
switch is set to either A or B the Vertical Alternate
above . Now, the Vertical Alternate Command switches
Command switches to the opposite state each time an
between the HI and LO states at a rate that is one-half
Alternate Pulse is received from the Horizontal Logic
the repetition rate of the Display B Command. The
stage. Repetition rate of the Vertical Alternate Command
resultant crt display in the ALT position of the VERTICAL
in this mode is one-half the repetition rate of the
MODE switch allows the RIGHT VERT unit to be
Alternate Pulse. The input conditions for these modes
displayed first against the A sweep (delaying) and then
are:
against the B sweep (delayed). Then the display switches
to the LEFT VERT unit and is displayed consecutively
Pin 1 LO-Alternate Pulse generated by Horizontal
against the A and B sweeps in the same manner . The
Logic stage goes negative .
input conditions for this mode of operation are: