Tektronix 7704A User Manual

P
in 4 L O-
Α
time-base
u
nit set for delayed operation .
P in
8
L O- MF C hannel Switc h Signal (Dis p lay Β )
generate d b y H orizontal Binary stage goes negative .
P in 10 L O- HO RIZO N TA L M OD E switch set to any
position except Α or Β .
Α logic d iagram of t he V ertical Binary stage is s h own in
F ig . 2-12 Α . Several logic functions in t h is stage are
p erforme d by logic d evices ma de up of d
iscrete com-
p onents .
T
h e com
p
onents t
h
at ma
k e up t h ese logic d evices
are i
d
entified
on t
h e Logic d iagram . An input/output table
for t h e V ertical Binary stage is given in F ig . 2-1 2B .
Plug-in B inary
Th e Plug-In Binary stage p ro d uces t he Alternate Drive
signal to provi de α plug-in alternate comman d to d u al-trace
p lug-in units . T h is stage uses t h e same typ e of IC as t h e
H orizontal Binary and V ertical Binary stages .
F
igure 2-13
identifies
t
h e function
of t
h e input
p
ins for
t
he
Plug-in
Binary IC, U 2540 .
Fig . 2-13
.
I npu t a nd o u t pu t pins fo r Plug-in Bina r y IC .
ALTERNATE
D R
I
VE
Wh en t he
Alternate Drive level is ΗΙan d t he plug-in unit
is set for
alternate operation, C hannel 2 of t he d ual-trace
unit is d is played . Wh en it is L O, C hannel 1 is d isplaye d . T he
repetition
rate of
t
he Alternate Drive output is determined
by t
he setting
of
t h e VER TICA L MOD E switch .
F
or all
positions
exce p t A L T, t he Alternate Drive level is t h e same
as t
h e Display Righ t Comman d from t he V ertical Binary
stage
. Since t he Dis p lay Rig h t Comman d was derive d
d
irectly from t he MF ( M ain F rame) C h annel Switc h Signal
(Dis
p
lay Β ), t h is allows t h e two ch annels of α d ual-trace
vertical unit to be slave d to t he time- b ase units (non-
delayed, d ual-swee p h orizontal mo d es only) in t he same
manner as p reviously describe d for slaving between t
he
vertical and time- b ase units .
T he
resultant C
R T p
resenta-
tion, w h en t h e d u al-trace
unit
is set for
alternate operation,
displays t he C hannel 1 trace at t
h
e
swee p rate of t h e Β
time-base unit and t
h
e C
hannel
2 trace at
t h e swee p rate of
t
h
e
Α time-base unit
.
Input con d itions for α L O out put so
t hat C hannel 1 of t h e vertical p lug-in can b e d is p laye d at
t h e Β -sweep rate are :
P
in 4 HI-VERTICAL
M OD E switch
set to any
position exce p t A L T .
P in 7 Η Ι -Α sweep to b e dis played .
Ci
r cuit Descrip tion- 7704A Service
Th e Alternate Drive switch es from ΗΙ to L O as t h e MF
Ch annel Switc h Signal (Display Β ) from t h e H orizontal
Binary stage switch es from L O to ΗΙ , and vice versa .
Wh en t he
VER TICA L M
OD
E
switc
h
is set to
A
L
T,
t h e
Display Rig h
t
Command from
t
he V ertical
Binary stage
switc h es
t
he vertical
d
is
p
lay
b
etween
t
he
two vertical units .
H owever, if eit h er
of t
he vertical plug-in units
are d ual-trace
units, t hey can be operated in t he alternate
mo
d e
also . To
provi de α switch ing command to t hese u nits, t h e Plug-In
Binary stage p roduces an out put signal wit h
α re
p etition
rate t h at is one-h alf t he repetition rate of t h e Display Righ
t
Comman d . T he se q uence
of
operation, w h en
two dual-trace
vertical units are installe d in t
h
e vertical plug-in compart-
ments
and t
hey
are bot
h
set for alternate operation, is as
follows ( VER TICA L MOD E
and
H O R IZO N TA L MOD E
switch es set to A L T) : 1 . C hannel 1
of
LEF T VER T unit
at
sweep rate of Β time-base unit, 2 . C h annel 1 of RIGH T
VER T unit
at
sweep rate of Α time-
b
ase u
nit, 3 . C h
annel
2
of
LEF T VER T unit
at swee
p
rate of
Β
time- b ase unit,
4 . C hannel 2
of
RIG H T VER T unit
at swee
p
rate of
Α
time-
b
ase unit
.
N otice t h
at
un d er
t
h ese
conditions, bot
h
c h annels of t h e LEF T VER T unit
are
displaye d
at
t h e
Β -sweep rate an d t h at bot h ch annels of t he RIGH T VER T
unit are displayed at t he Α -sweep rate . T he repetition rate
at t h e out put of t h is stage is one-h alf t h e Display Righ t
Comman d rate . In put con d itions, w hen t h e VER TICA L
M OD E switch is set to A LT, are :
P
in 4 L O-
VER TICA L MOD E
switc
h set
to
A L T .
P in 8 L O-Dis p lay Righ t Comman d generated by
V ertical Binary stage goes negative .
F
igure 2-14
Α
s
h
ows α
logic
d iagram of t
he
Plug-in
Binary
stage
.
An
input/o u tput table for t h is stage is s h own
in
F
ig . 2-14
Β .
2- 1 9

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English