Tektronix PG 508 User Manual

O pe
r ating Instructions-PG 508
Defi n itio ns
of
P ulse C ha r acteristics
T he followi n g is α glossary of commo n p ulse
c h aracteristics u sed in t h is ma n ual . T hey are illust r ate d i n
F ig . 1-8 .
Amplitude
.
T he m aximum absolute p eak value of α
pu lse m eas u re d from t he b aseli ne r ega r dless of sig n , a nd
excl ud i n g un wa n te d abe rr atio n s o r ove r shoot . M eas u re-
me n t p oi n ts are at 50 ο/ο of t he p ulse du r atio n time ( pu lse
h ig h level) a ndon t h e baseli ne ( p ulse low
level) at 50 ο/ο of
t h e off ti m e
(t h
e p
ulse p
e r
io
d m i n us t he pu lse du r atio n ) .
A b erratio ns . U nwa n te d deviatio ns or excursions i n t h e
pulse sh ape form an ideal squ are corn er a nd flat to p , i .e .,
oversh
oot,
und ers h
oot
or round i n g, ri n gi n g, a nd tilt or
slo pe .
B
aseli n e .
T he q
uiesce
n t
do
voltage refere n
ce
level
of
t h e p ulse waveform .
Com p leme n tary P ulse . N ormal p ulse wit h h ig h an d low
levels i n terc h a n ge d . Pu lse on-time b ecomes pulse off-
time .
Duty Factor . Someti m es referre d to as d u ty cycle . T h e
ratio of p u lse du ratio n to p erio d , or t he p ro duct of p ulse
du ration and pu lse repetitio n rate . Duty factor in ο/ο ==
Duration/ P erio dΧ 100 .
F alitime .
T
he time interval, at t h e pulsetraili n ged ge,
for
t he pu lse amplit u de to fall from t he 90% am p litu d e level to
t he 10% ο amplitu d e level .
Overs h oot

φ 4 Ρυ 1se D ur atio
n
Pulse Top
F lat n ess
D u ty F actor = Pulse D u ratio n / P ulse P erio d
B aseli ne
F lat n ess
Pulse P erio d
Τ = 1/ R ate
F ig . 1-8 . Pulse cha r acteristics .
Flat ness .
T
he abse n ce of lo ng term variations to
t he
p ulse to p ; exclud i ngoversh oot,
ringing
or p
u lse
ro
u nding .
Sometimes
r eferred to as tilt
or
slo pe .
H ig h Level . The most p ositive value of α pulse,
regar d less of unwanted a b erratio ns or oversh oot,
measu r ed at α p oi n t t h at is locate d at 50 ο/ο of t h e p ulse
d uratio n .
L ow L evel . Th e most n egative value of α p ulse,
rega r dless of un wa nted ab erratio ns o
r ove r
s
h oot,
measure d
at α
point t h at is 50% ο of t h e off time .
Offset . Α do p otential of eit he r p
olarity
ap p
lie d
to
t he
waveform to bias t he baseline to
an
am p litu d e ot h er t h a n
zero .
Overs h oot
. T h e
s
h ort term p ulse excursion (o r tra n -
sie n t) above t h e pu lse to p or below t h e baseli n e, w h ic h is
simultaneo u s to t h e lea d i ng or traili ng edge of t h e p ulse .
P erio d . T h etime interval forafull pulsecycle, inverse
*
of
fre qu e ncy or repetition rate, or t h e interval b etween
corres po n di ng pu lse am
p
litudes of two co n secutive υη -
delayed
or
delaye d pu lses
. Ge
n erally
meas
u re d b etween
t h e 50 ο / ο am p lit u de levels of two co n sec u tive p ulses .
P res h oot . Α tra n sie n t exc u rsio n t h at prece des t he ste p
fu n ctio n . It may be of t h e same or opposite p ola r ity as t h e
pulse .
REV . Β , A PR . 1977

Tektronix PG 508 Specifications

General

Brand	Tektronix
Model	PG 508
Category	Pulse Generator
Language	English