Tektronix 7834 - Page 75

Pin
4 LO-HORIZONTAL MODE switch in
any position
except
ALT, CHOP, or when the A time-base
unit is set
for delayed
sweep .
Pin 10 HI-HORIZONTAL
MODE switch set to A or
B .
2 . ALT OR CHOP
MODE (HORIZ)-NONDELAYED . In
the ALT or CHOP positions
of the HORIZONTAL MODE
switch, the output level at pin 6
is the same as the Display
A level at pin 7 . "The Display
A level is produced by invert-
ing the Display B level
from the Horizontal Binary stage
.
(A)
U4358
Therefore,
the repetition rate of
the output signal is the
same as the Display B signal
. The result (with the
VERTI-
CAL MODE switch
set to ALT or CHOP and the
A time-
base unit set
for nondelayed operation) is that
the RIGHT
VERT unit is
always displayed at the sweep rate
of the A
time-base unit,
and the LEFT
VERT unit at the sweep rate
of the
B time-base unit (independent-pairs
operation or
sweep
slaving)
.
The input conditions to
provide a HI output
level so that the RIGHT VERT unit
can be displayed at
the A sweep rate are :
(D = HAS NO EFFECT
IN THIS CASE
n+1 = IF OUTPUT
IS
LO
PRIOR TO LO', IT GOES HI, AND
VICE VERSA
'ACTUATED
BY NEGATIVE-GOING EDGE .
2 REPETITION RATE ONE-HALF HORIZONTAL
CHOPPED
BLANKING RATE .
3 REPETITION RATE ONE-HALF ALTERNATE
PULSE RATE .
Theory of Operation-7834
Figure 3-11 . (A) Logic diagram
for Horizontal Binary stage ; (B) Table of input/output
combinations .
MAI N
FRAME
CHANNEL
SWITCH
SIGNAL
(DISPLAY
B)
(1195-11) 1988-36
3- 1 9