Tektronix 7834

Theory of Operation-7834
TRIGGER
SIGNAL
FROM LEFT
VERTICAL UNIT
TRIGGER
SIGNAL FROM
RIGHT VERTICAL
UNIT
LEFT
TRIGGER
PREAMPLIFIER
U520
A TRIGGER
CHANNEL
SWITCH
0524
U526 B, C
U532 B, C
RIGHT
TRIGGER
PREAMPLIFIER
U580
TABLE 3-2
VERTICAL
SIGNAL
OUT
AMPLIFIER
0548
0558
A TRIGGER
OUTPUT
AMPLIFIER
0588
0598
Figure 3-23 . Detailed
block diagram of the A Trigger Selector circuit .
Input/Output
Combinations for A Trigger Channel Switch
A Trigger
VERT
SIG OUT
TRIGGER SIGNAL
,- . ._ . ._-,o-TO A HORIZONTAL
UNIT
'

(D-Has no effect in
this case .
z

Switches between HI and LO at a rate determined by the sweep speed of time-base unit(s)
installed in the horizontal compartment(s) .
1988-48
A Trigger
Channel Switch
Output to
U520 and U580
Vertical
A TRIGGER
Mode
SOURCE VERTICAL
Command
Switch MODE Switch
(HI =1 V,
Positions Positions
LO=-0 .5V)