Tektronix PG 508 User Manual

Operating Instructions-PG508
For external
DURATION place the DURATION control
i
n
t h
e
ΕΧΤ D UR p osition, and t h e PER IOD co n trol in t h e
ΕΧΤ T R IG O R MAN position . T h e pe r io d and d uratio
n
of
t he out p ut waveform are now co n trolled by t he triggeri
n g
waveform . T h is is an extremely useful mo d
e
of
o p eration
for tra n slati ng
logic levels, etc . If t he PER IOD is set for
inter n al o p eratio
n and t he D UR ATIO N for exter n al, t he
CO
N TRO L ERR OR lig h t illumi n ates in d icati ng an illegal
mo d e of operatio n .
Th e
TRIG'D/GAT E D in d icator lig h t functio ns as
α
TRIG/GATE level indicator . Wh en t h e-1-S L O PE is
selecte d
and t h e exter n al inp u t level excee d s t
h e t h res h ol d set by
t he T R IG/GATE LEV E L co n trol, t
h
e
lig h t is on continuous-
ly . F or i npu t voltages
below t h e t h res hold t h e lig h t is
co n ti nuously
off . Wh en t he i n p ut tra n sits t h roug
h t h e
t hr eshold t he lig h t flas h es . Wh en t h e-S
L O PE is selecte d
t he lig h t beh aves as
for λ
-S
L O PE selectio n . H owever, t he
p olarities are reversed .
TheT R IG'D/GATTED i nd icator
lig h t may be used as α
logic
level i
nd icator for
troubleshooting logic circuitry . Set
t he TRIG/GATE LEV E L , co n trol to α voltage e q ual to t h e
midra n ge val u e of t he logic voltage swing . If an atte nuator
probe is use d for signal p ic k u p , re m em b er to
consid er t he
atte nu ation factor w hen setti ng
t he TRIG/GATE LE VEL
voltage .
Trigger Out p ut
T he signal a pp earing at t he co nnector
is
an ap-
proximate square wave . T he leadi
n g
edge
(positive-going)
Output
Termi n ations and Co nn ections
T
h eP G 508 o p erates as α voltage source
in series wit h
an
i n ternal 50 Ω im ped ance . M
aximum p ulse fi d elity is
obtai ned w hen t he out p ut op
erates into an exter n al 50 Ω
impe dance . The out p ut
circuitry of t h eP G 508 is fully
p rotecte d agai n st any
voltage transients w hen o p
erating
i n to p assive
loa d s .
Table 1-1 lists static control settings t h at
illuminate t he
CO N TRO L ERR OR lig h t a nd t
h
eir
corresponding
operati n g modes . Some of
t h
ese mo
d es may be u seful .
If t he loa d h as α d ovoltageacross
it,
co
nn ect α b loc k i ng
capacitor in series wit h t h e O U
TP U T co n nector an d t h e
loa d . M a
k
e
certain t h e time con sta n t of t h e capacitor and
load is
large enoug h to mai n tain pulse top flatness .
p recedes
the output pulse by α s pecified fixed delay p lus
t h e delay as set by t he D EL
AY control . In paired p u lse
o p eratio n , t he lea d ing e d ge p rece d es t
he first p u lse b y t he
fixed delay . T he seco nd p
ulse t he n appears after t he set
d elay .
Α com p leme n t sq uare wave ( n egative-goi n g
leadi n g edge) is also available at t he front
panel by movi n g
α con n ector on t h e timing circuit board .
See t he illustra-
tio n on t h eR ear I n terface Co n necto r Assignme
n
ts
at t h e
rear of t h is man u al for t h e locatio
n
of
t h
is
co n nector .
Manual Trigger
To use t h is featu
r e p lace t h e PER IOD switc h in t he
ΕΧΤ
TR
IG
OR MAN p osition . Set t h e TRIG/GATE
LEVEL
control fully cloc k wise . If t he +S
L
O
PE is selecte d , t he
ma n ual trigger will occur
w hen t he MAN button is
d epresse d . If t h e --SL O PE
is selecte d , t h e trigger occ u rs
w hen t h e butto
n
is
released . T he ma n ual trigger causes
o
n
e
out p ut p ulse, or α set of paired pulses if t
he D EL AY
a nd UN D L Y buttons are depresse d .
Control E rror L ig h t
T
h e CO N
TR
O L ERR O R lig h t h el
p
s to solve set up
pro b lems by i n dicati ng most control errors
.
Α
steadyglow
in d icates static co n trol setti ng errors w h ile α flas h i ng lig h t
i n d icates d y n amic errors . In eit h er case, t h e control
settings d o n ot co r rectly i nd icate t he output . C h ec k t he
co n t r ol setti ngs for com p ati b ility . See Table 1-1 . Dynamic
fu
n ctio n
s monitore d are p erio d , d elay, duratio n an d
tra n sitio n time .
T AB LE 1-1
Control Setti n
gs

Operation
ΕΧΤ TR 1G Υ O R ΜΑΝ and~ ψ
---
SY NC GATE
ΕΧΤ D UR and Internal
P eriod
ΕΧΤ TRIG O R MAN and
SO W A VE ( ΙΝΤ `
P ERIOD)
SO
W A VE ( ΙΝΤ
PE
R IOD)
and SY NC GATE
SO W A VE ( ΙΝΤ PERIOD)
and D E LAY
ΕΧΤ D UR an d D EL AY
E xter n al Trigger M o d e
Square W ave M od e
Truncated
s q
uare wave w h en
gate en d s
REV . Α , ΜΑΥ , 197 6

Tektronix PG 508 Specifications

General

Brand	Tektronix
Model	PG 508
Category	Pulse Generator
Language	English