Tektronix 7704A User Manual

As s
h own
by
F ig . 2-6 Β , t he ou tp u t of t h is stage is
HI
only
un d e r one set of in pu t con d itio n s . T h is set of
cond itions d isa b les t he Β sweep w h ile t he Α sweep is being
displaye d in t he A L
T
h orizo n tal mo d e if bot
h u
nits
are in
α
time-base mo de an d non-delayed sweep is
use
d .
F
or any
ot h er combination of in p ut con ditions, t he
Β
Swee p
L oc kout level is L O .
H
owever, t
h
e loc kout
level
to t
h e Β
time-base unit is d etermine d b y bot
h
t
h e Delay Gate from
t
h
e
Α time-
b ase
unit
an d
t h e Β Swee p Lock o u t level
produced
by
t h is stage . T h e Β sweep is enab le d only w h en
b ot h of t h ese levels
are L O .
F
ig
u
re 2-6
Α
s
h
ows t
h e logic
diagram of
t h e Β Sweep
L oc k out stage
. T he
gate
connecte d to t he output of t h is
stage is α p
h antom-O R gate located on t he M ai n Interface
d iagram
(
α ph
antom-O R
gate
p erforms t he O R -logic
function merely b y inte
r connection
of t
h e two signal lines)
.
Χ - Υ
Com p e n satio n
ΙΒ 1
Delay Gate fr o m
Α ti m e- b ase un it
A L
T
M ode (
h
o
r
iz)
ΙΑ H o
r
iz)
( Β H o r iz)
Ε
5
Delay M ode

12
Co n t r ol O u t
16
MF C h a nn el Switc h
Ε
-
Sig n al (Dis p lay ΒΙ
U
2573
Ο 3
Φ = H as no effect i n t h is case
Input
Alter n ate

Pulse

Generator . The

t
h ir d function
performed by t
he H orizontal L ogic stage is to p ro duce an
Alternate P ulse signal for use by t h e H orizontal an d
V ertical B inary stages . T he Alternate P ulse is p ro duced at
t h e en d of eit h er sweep, depen d ing upon t he operating
conditions
as
s h own in F ig . 2-7 Β . Th e h ol d off gate
produce d
at
t h e end of t he sweep b y t h e respective
time- b ase u nit is differe n tiate d by eit h er C2575 or C2573
to provide α positive-going p u lse to p in 6 or 9 .
In F ig . 2-7 Α , note t he resistors s h own connecte d to pins
6 and 9 . T h ese resistors, w
h
ic
h
are i n ter n al to t h e IC,
h
ol d
t h e levels at pi n s 6 an d 9
L O u nless
α
ΗΙ level
is applie d to
t
h e
corres p ondi
n g i n put . Since t he h
ol
d off gate is
capacitively-cou p le d to p ins 6 an d 9, t h ese inputs are at the
L O level except w h en α d ifferentiate d Α or Β H ol d off gate
is receive d .
Q2579
HI
4
HI
5
HI
12
LO
All ot h er co mb i n atio n s
16
L O HI
L O
O u tput
Ci r cuit
Description-7704A Service
Swee p L oc kou t
to Β time- b ase
un it
See M ai n Interface
F ig . 2-6
. (
Α
)
L ogic d iag r am for Β Swee p L oc kou t stage ;
(
Β
)
Ta b le of i np u t/o u t p u t com b i n atio n s .
2-11

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English