Tektronix PG 508 User Manual

T h eory of Operation--PG 508
DE L AY
proximately t he same amou n t as t h e circuitry i n t h e
variable transition time ge n erator . The p ositive-going
waveform from pin 14 of U 740C is fed t h roug h p i n 6 to t h e
cloc k input, pin 6, of fli p flo p U 720A . - The n egative-goi
n g
out p ut from
p
i n 15 is
fe d
to
t h e cloc k i np ut pin 11, of fli p
flop U 720B . Flip flo p U 720A senses t he pulse traili n g
timi ng error a nd U 720 B , t he p ulse lea d ing timing error . If
t he lea d i n g time from the o u t pu t of t h e variable tra
n sitio n
ti m e gen
erator
is slow
enoug h so t h at t h e D i n put of
U 720 B has n ot d ro p pe d below a pp roximately t h e 50°/ ο
p oi n t, w hen t he waveform at t h e cloc k in p ut of fli p flo p
Switc h es are close d w hen cont
r ols are in t he labele d p ositio n .
T he CO
NT R
O
L ERR
O
R lig h t ill um inates w h en t he un it is set to o pe r ate
Dela y a nd S qu a r e W ave
Delay an d E xter
n
al
D u ration
I
n ternal
Pe r
io
d a nd Exter n al D u ratio n
I n te rn al P e r io d ,
Sy
n
c
hr
on o us Gate a ndS qu
a r e W ave
E xte rn al T r igge r and S qu a r e W ave
E xte rn al Trigge r and Synch ro nous Gate
u nd e r t he followi ng cond itions :
F ig . 2-1 . Sim p lified sc h ematic fo r CONTRO
L ER RO R indicato r logic wit h con trol
setti n
gs
causi ng illuminatio n .
To
CO N TRO L
E R RO R
L ig h t
Circ u it
U 720 B (waveform
driving t h e tra n sition time board) goes
p ositive (e
n
d of p ulse), t
he h ig h
on
D input, p i n 10,
tra n sfers
to
t he out p ut, p i n 15, a nd t h e CO N T RO L ERRO R
lamp is lit .
Wh en p in
15,
of
fli p
flop
U 720 B goes h ig h , C734 sta r ts
to
ch arge t h rough R 728 . Wh en t he voltage at p i n 13 of
U 720 B a n d p in 5 of U 720A reac h es t h e h ig h level
(-4 .0 V),
both fli p flops are reset to t h eir
initial con d itio n s
and
t h e
CONTRO
L ERROR lig h t goes out . If t he trailing ti m e of t h e

Tektronix PG 508 Specifications

General

Brand	Tektronix
Model	PG 508
Category	Pulse Generator
Language	English