Tektronix 7834

Theory of Operation-7834
RIGHT VERTICAL
TRIGGER SIGNAL
FROM
B TRIGGER
SOURCE
Switch
Positions
RIGHT VERT
VERT MODE
LEFT
TRIGGER
PREAMPLIFIER
U620
Figure 3-24 . Detailed block diagram of the B Trigger Selector
circuit .
TABLE 3-3
Input/Output Combinations for B
Trigger Channel Switch
Vertical
Mode
Command
(HI = 1
V,
LO = -0 .5
V )
B Trigger
B Trigger
Channel Switch
Output to
U620 and U680
1988-49
U680
'

(D-Has no effect in this case .
Switches between HI and LO at a rate
determined
by
the sweep speed of time-base unit(s) installed in
the horizontal compartment(s) .
B TRIGGER
B TRIGGER
CHANNEL
OUTPUT
TRIGGER SIGNAL
SWITCH AMPLIFIER ---- TO B
HORIZONTAL
0624 Q688 UNIT
U526 A,
D
Q698
3
U532 A,
D
LEFT
VERTICAL
TRIGGER
SIGNAL
FROM
B TRIGGER
RIGHT
FROM B
B
TRIGGER
TRIGGER
VM
1
SOURCE
SWITCH
B
TRIGGER
VM 2
VERTICAL
MODE
COMMAND
FROM LOGIC