Tektronix 7704A User Manual

Circuit Description
-7704A Service
Input
?~~-_Omp .r .tol
Φ = H as no effect
i n t h is
case .
1
R a mp sig n al ; co n si d e r e d L Ow he
n
mo
re n egative t h a n abo u t ze r o volts .
2
Negative-going pulse
3 P i n 5 can be HI a n d not
affect op eratio n if p i n8 is L O, a nd vice ve
r
sa .
Output
V er tical
C hopped
B la nk i ng
T h e Delay R am p signal from t
he Cloc
k
Generator stage
d etermines t h e repetition rate and
pulse widt h of t h e
V ertical C ho pp ed B lan k i n
g p ulses
.
T h e Delay R amp a pp lied
to pin 10 starts to go
negative from
α
level of a b out +1 .1
volts coinci dent wit
h t he lea d ing edge of t he Cloc k pulse
(see
waveforms in F ig . 2-17) . T h is results in α ΗΙ q uiescent
condition for t he V ertical C h op p ed B lan k ing pulse . T he
slo p
e
of t
he negative-goi ng Delay R amp is d etermine d b y
t h
e
Cloc k
Generator stage . As it reach es α level slig h tly
negative
from ground, t he V ertical C hop pe d B lan k ing pulse
out put
level ch anges to t he L O state an d remains L O until
t
h e Delay R
am
p goes HI again .
2- 22
F ig . 2-16 . ( Α ) L ogic d iagram fo
r V ertical C h opp e d B la nk i n g stage ; ( Β ) Table of i npu t/o u t pu
t co mb inations .
N otice t h e delay
between t h e lea d ing ed ge of t he Cloc k
pulse generated by
U 2510A, and t he leading ed ge of t h e
V ertical C ho pp e d
B lan king p ulses . T h e amount of delay
b etween t he leading
e
d
ges of t h ese p ulses is d etermine d by
t he Delay R amp a p
plied
to
pin 10 . T h is d elay is necessary
d ue to t h e delay
line in t he vertical d eflection system
.
Ot h erwise, t
h
e
trace blank ing resulting from t he V
ertical
C h opped
B lan
k
ing pulse woul d not coincide
with t h e
switc
h ing between t h e d isplayed traces .
T he d uty cycle of
t
h e s quare wave produce d
in
t
h e Cloc k Generator stage
determines t he p ulse
wid t h of t he V ertical
C h
o pp
e d
B lan k ing p ulses (see
Cloc k Generator descri p tion
for more
information)
.
G
V
'Z
ΔW
,
W Υ ' V - W
3 5
6 7 8
10 1 4 2 Co nd itions
HI
Φ Φ L O Φ
L O L O CH O
P M
o
d e (ve r
t)
LO
LO L O LO
Φ L O L O L
eft P l u g-i n Cho pp ed
L O Φ HI L O
L O L O L O
R ig h t P l u g-i n C h opp e d
L O L O 3
L O HI L O 3 L O
L O ADD M od e, L
eft or R ig h t
P l u g-i n C ho pp ed
All ot h e r co mb
i n atio n s HI No
V e r tical C hopped B la nk i n g
Ι Ι
pu lses at o u tp u t .
CH O P M o d e
Ive r O
L eft Plug-in M o d e
(C
h op I nh i b it)
Dis p lay R ig h t
Co
mm a nd
ADD M o d e (ve r t)
R ig h t Plug-in
M od e
8
(C
h
o p
I nh i b it)
1
Delay R am p
U 2510 B

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English