Sawtooth Generator; Sweep Start Amplifier; Sweep Stop Comparator; Holdoff Capacitor And Amplifier - Tektronix 7B51 Instruction Manual

Circuit Description-Type 7851
~Lr
r-------~~~!::~
~
DELAY GATE
, to Indicator
7
Oscilloscope
Delay DELAY CONTROL
_ Switching
~
DELAY MODE
1----,---.._------------'4
to Indicator
Amplifier Selector
~7
Oscilloscope
Q482, Q492
Sawtooth
IDTM
I
~
r - -
~~:6
to Indicator
Oscilloscope
\
...--L,,--
Delay
~
Comparator I-____________
-------~
Q520A& B
1
Q510 A & B
_-.C
t
Sweep
T,;""",,,
J
Sweep Start
~
LT
Sawtooth
Gate in
I
~p~~
Disconnect Sweep
-A-
Sawtooth
'P-'--'--'-'---I
E. F.
.>--....
---------4~~ Amplifier
1-..... -1
Generator H~H~-----'" to Horizontal
7
402 Q526
I
Q532 A & B Preamp
Q534
LOCKOUT
~:r
RESET
~
t
-50 V
Sweep Stop
Comparator
Q406, Q408
end of Sweep
1;~~::.
Hm.
W.HOLDOFF
HOlDOFF
to Sweep
E'('-------....
Sweep Reset
Gate Stage ' Multivibrator
REMOTE READY
r----
Q432, Q436
/ LAMP
Circurit~'t.l.----.
Sweep Holdoff
Multivibrator
Q554, Q564
Q566
" to
1--+-----...
---+-----+--
4 /
Indicator
Oscilloscope
" Lamp
'L-@:-
Driver
+5 V Q442
Q446
Reset
r
RLE:~:l ~--V
. - DS446
7
~,eep
Control
I-oII;...JL ___
1
Amplifier
L~--
Reset Amplifie
S325E P454, Q456
Sweep 1 mA or more
inhibited
J
Sweep free
~//,.
torun
o
mA...J
Lf
I
Sweep Inhibit
I
Comparator I---J
~S-w-ee-p--l
Q410, Q416, f - - -
Inhibit Q424
/ DELAY MODE Control
Q468
Holdoff Capacitor
and Amplifier
Q582,C580
Holdoff
Disconnect
Diode
CR571
Sweep Start
Amplifier f---J
Q592 A & B
>' i
5
V
I
'---.-5TARTS AFTER DELAV
+3 V ' - - TRIGGERABLE AFTER DELAY
These voltages present only if the
Plug-In is used as a Delayed
Sweep Time-Base.
o
V
~DEPENDENT
Fig. 3-6. Sweep Generator Block Diagram.
3-8
®