Tektronix 7704A User Manual

Circuit Description -7704A
Service
Sym b ol
Descriptio n
Α b ista b le d evice with t h ree or
more i npu ts and two ou tp u ts
(eit
h
e r or b ot h outp uts may be
u se
d ) .
Wh en t
r
iggered, t he ou tp u ts
c h an ge state i n res p on se
to
the
states at t he i n puts prio r to t he
t r igger . T he o u t p u ts are co m p le-
me n ta r y (i .e ., w he n one ou t pu t is
HI t h e ot h er is LO) . T he ed ge
symbol on t he trigge r ( Τ ) inpu t
may be of eit he r p olarity d ep e nd i ng
on t he device .
F or d evices with d irect-set
(SID)
or
d i r ect-clear (C o ) i np uts, t he indi-
cate d state at eit h er of t h ese i np uts
over-ri d es all ot he r i np uts (i n -
cl ud i n g t r igge r ) to set t h e outputs
to t he states s h own in t he in pu t/
outpu t ta b le .
Device
Triggered
Set-Clear
( J - Κ )
F li p - F lop
F lip- F lop with
Direct I np uts
(may be a pp lie d
to all triggere d
fli p -flo p s)
CA L I BR ATO
R A ND FR ON T P A NEL
Intro d uction
2-6
Diagra m 1 s
h
ows t
he
front- p
anel controls, t h e
i n terco n nections between t h ese co n trols and t h e controlled
circuits,
and t
h e Cali
b
rator circuit . T he circ u itry associate d
with Q2080 an d Q2090 is d escribed in connection wit h t h e
Trigger Selector circuit (diagram 4) .
T h e Calib rator circuit provides α one- kilo h ertz
s q uare-wave signal at t h e front-panel CA L I BR ATO R
pin- j ac ks . Α b loc k diagram of th e Calibrator circu it is
s h own on
F
ig . 2-2 .
TA BLE 2-1
(cont .)
2- kH z Oscillator
Calibrator Count d own
In put/Ou t p
ut Ta
b
le
Input O u tp u t
Output co nd itio n s s h ow n afte r
t r igge r pu lse
I nput O u tput
Φ = Has no effect in t h is case
' Output state d ete rm i ned b y
co nd itio n s at t r igge r e d i npu ts
Q1001 and Q1003 are connecte d as α two-
k ilo h ertz,
asta b le emitter-co u ple d multivibrator to
provide t h e drive
signal for t he Calibrator Count d own stage
. T he repetition
rate is determined b y
R
1004,
R 1007, C1001, and t h e
collector su pp ly voltage
for Q1001 . T he 1 kH z a d j ustment,
R 1001, sets t h e collector voltage
of
Q1001 so an
accurate
two- k ilo h ertz square wave is p ro
duced at t h e collector of
Q1003 .
C1004 an d
R
1009 d ifferentiate t
h
e two- k ilo
h
ertz signal
from t
h
e collector of Q1003 to pro d uce positive- an d
negative-going pulses coinci d ent wit
h
t
h
e rise an d fall of t
h
e
Ο
Α
Β Χ Χ
L O L O No c h a n ge
L O HI L O HI
HI L O HI L O
HI HI
I
1_
Cha n ges
state
Α Β C D Χ Χ
No
'
' L O L O
c h a n ge'
Φ Φ L O HI L O HI
Φ Φ HI L O HI L O
Un d e-
Φ Φ HI HI
fi n e d

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English