Tektronix 7834 - Page 77

MAIN FRAME CHANNEL
SWITCHSIGNAL
(DISPLAY B)
(A)
U4368
INPUT
B-sweep
rate and that both channels of the RIGHT
VERT
unit are displayed
at the A-sweep rate . Input conditions
when the VERTICAL
MODE switch is set to ALT are :
Pin 4 LO-VERTICAL MODE
switch set to ALT .
'ACTUATED BY NEGATIVE-GOING
EDGE .
2 REPETITION RATE ONE-HALF
ALTERNATE PULSE RATE .
'REPETITION RATE ONE-HALF
DISPLAY B RATE .
9> = HAS NO
EFFECT IN THIS CASE .
n+1 =1F
OUTPUT IS LO PRIOR TO LO' IT GOES HI, AND
VICE VERSA .
OUTPUT
DELAYED MODE
DISPLAY LEFT

j
(SWEEP-SLAVING)
Figure 3-13 .
(A)
Logic
diagram
for
Vertical Binary stage ; (B) Table
of input/output combinations .
Theory of Operation-7834
VERTICAL
ALTERNATE
COMMAND
(1195-13) 1988-38
Pin 8 HI or LO-Plug-In
Alternate Drive signal changes
state at HI to LO transition
of Vertical Alternate Com-
mand pulse .
Figure
3-15A shows a logic diagram of the Plug-In
Binary
stage . An
input/output table for this stage is given in Fig-
ure
3-15B
.
3- 2 1