Tektronix 7704A User Manual

switc
h ,
w
h
ereby t
he LEF T VER T unit is always displayed
at
t h e swee p rate of t he Β time-b ase unit . Wh en t h e Α
time-b ase unit is set to t he delayed mo d e, t h e repetition
rate of t he Display Righ t Comman d is
one- h alf
t
he
repetition rate of t he
MF C hannel
Switc
h Signal (Dis p lay
Β ) .
T
h is results in eac
h vertical unit being d is p laye d first
against t h e
Α
time-base
unit (delaying), t h en t he Β
ti
m
e- b ase u nit (delaye d
), before
t
he display is switched to
t h e ot h er vertical unit .
T he Display Β Comman d is u se d in t he following stages
with in t he L ogic Circuit : Plug-in Binary, V ertical C h op p e d
Blan
k
ing, an
d
V ertical M
o
d e L ogic . It is also connecte d to
t
h
e
following circuits elsewh ere in t he instr u ment to
in d
icate
w
h ic h vertical unit is to b e d isplaye d (t h roug h
V
ertical M
ode
L
ogic
stage ; A L T vertical mo d e only) : M ain
Interface, Trigger Selector, and V ertical Interface circuits .
T he V ertical Binary stage uses t he same type of IC as t he
H orizontal Binary stage . F igure 2-11 i d entifies t he functio
n
of t he in put pins for U 2535 . N otice t h e Display
Α level
at
p in 7 . T h is input is t h e inverse of t he
MF C hannel Switc h
Signal (Dis p lay Β ) at pin 8 . T h erefore, t h
e Dis
p
lay Α level
is
always HI w hen t he
MF
C
hannel Switc h Signal (Display Β )
is LO, an d vice versa . T h e following discussions d escri b e t he
operatio n of t he V ertical Binary stage in relation to
t he
mo d es of operation t
h
at can
occur .
A L T OR
C
HOP
M OD
E
(H O R IZ)
AN D NOT
DEL AY E D M OD
E
MF
C H A NNE L
S W
ITC H SIG N A L
(DIS PL AY Β )
Fig . 2-11 . Inp u t a nd o
u t pu t pi n s fo r V ertical Bi na r y IC .
ΝΟΤΕ
DIS PL AY RIG H T
CO M M AND
Although t he output at pin 6 of U 2535
is
always
controlle d b y t he HO R
IZO
N TA
L M
OD
E switc h as
described her e, t
h
is
level determines t he MF C h annel
Switc h Signal (Display R ig h t) level at t he collector of
02556 only in t h e A L T position of t h e VER TICA L
M OD E switc h due to AND gate C R 2552-C
R 2553 .
See t h e discussion of t he V er tical
M
ode
L ogic stage
in
t h is section for fu
r
t
her information .
1 .
ΑO R Β M OD E
Β .
Circu it Description- 7704A Service
Wh en t h e H OR IZO N TA L M
OD
E
switch is set to eit h er
Α or Β , t h e Display Righ t Command
switc
h
es to t
h
e
opposite state eac h time an Alternate P ulse is receive d from
t h e H orizontal L ogic stage . Repetition rate of t h e Display
Righ t Comman d in t h is mo d e is one- h alf t he re p etitio n rate
of t he Alternate P ulse . T h e input con d itions for t h ese
mo d es are :
P
in 1 L O-Alternate
P
ulse generate d b y H orizontal
L
ogic stage goes negative .
P
in 4 L O- HO
R
IZON TA L M OD
E
switch in any
position except A L
T
or C HO
P ,
or t h e Α time-b ase unit is
set for d elayed swee p .
P
in 10 HI-HORIZONTAL M OD E switch set to Α or
2 . A L TO RCH O P M OD
E (
H O R IZ)-NON-D EL
AY E D
In t he A L T or CH O
P
positions of t
h
e
H O R IZO NTA L
M OD E
switc
h ,
t
he
output
level
at
pin 6 is t he same as t h e
Display Α level at pin 7 . T he Display Α level is produ ced by
inverting t h e MF C hannel Switc h Signal (Display Β ) from
t he H orizo n tal Binary stage .
T
h erefore, t h e repetition rate
of t
he
out put
signal is t h e same
as
t he MF C h annel Switc h
Signal (Display Β ) . T h e result, wit h t he VER TICA L M OD
E
switc h set to A L T an d t he
Α
time- b ase unit set
for
non-delayed operation, is t h at t he RIG H
T VER T
unit is
always d isplaye d at t h e sweep rate of t he
Α time-
b ase
unit,
and t h e
LEF T VER T unit
at t
h e sweep rate of t h e Β
time-base unit
(sweep slaving) . T he input con d itions to
p rovi d
e
α
Hl
o
utpu t level so t hat t he RIG H T VER T unit
can b e d isplaye d at t h e Α -sweep rate are :
P in 4 HI-HORIZONTAL M OD E switch set to A L T
or CHO P with non-delayed sweep .
P in 7 HI -Α swee p is to be d isplaye d ; MF C hannel
Switc h Signal (Display Β ) L O .
P in 10 L O- H O R IZO
N TA
L M OD
E
switc
h
set to
any
p osition exce p t Α or Β .
Th e inp u t con d itions
to
provide
α
L O
output
level
so
t h at t h e LEF T VER T unit
can
be d is p
laye
d
at t
he Β -swee p
rate are :
P in 4 HI-HORIZONTAL M OD E switch set
to
A LT
or C HO P with non-delayed swee p .
P in 7 LO- Β sweep is to be dis p
laye
d ; MF C hannel
Switc h Signal (Display Β ) HI .
P in 10 L O- H O R IZO N TA L M OD E switch set
to any
position except Α or Β .
2- 1 7

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English