Tektronix PG 508 User Manual

Operating
In st r uctio n s-PG 508
P eriod an d Du r ation
Selection
To d eter m i n e t h e custo m ca p acitor
val ue m u lti p ly the desi r ed d u r ation o
r
d elay time b y 1 Χ
10-2 .
See text .
T he p erio d ge n erato r ope r ates, in
all mo des exce p t ΕΧΤ
TRIG o r MAN, at α rate set by
t he PER IOD ra nge switc h
an d va r iable co n t r ol
. T he d uratio n of t he output pulse is
set b y t he DURATION
r ange switc h an d va r iable control
.
Wh e
n
t
he
DURATION
control is set fo r αtime
greater t han
t h ePER IOD, t h e CO N TRO L ERRO R lam p
will lig h t . Wh en
t he D UR ATIO N co n trol is set to t he SQ W
A VE positio n , t h e
du
r ation time is d ete rm i ned i
n
ternally
at a p pr oximately
50 ο/ο of t he p erio d ti m e .
T h
e custom range positio
ns on t he PER IOD a n d
D U RATIO N controls permit u ser-selecte d pe r iod a nd
d uratio n times . To d etermine t he a pp roximate ca p acitor
value for
t he d esired
p
eriod, multi p ly t h e p e r io d time in
seco
n
ds
b y 5 Χ 10 - ' . T he result is t h evalue of t hecapacitor
i n
F
arads .
F
or
example, α 50 ms p e r io d times 5Χ 10 -'
eq uals 250 Χ 10 -6 or 250 μ F . T h is capacitor mustbe non-
polarized and h ave at least α 6
V r ating . Solde r t h is
ca p acitor i n t he p ositio
n
s
h own i n F ig . 1-2 .
To d etermine t he capacitor
value for t he d uration time
d esire d , multi p ly t h e
duration time by 1 Χ 10 -2 . F or
example α 50 ms duration
time re q uires 50 ms times 1
Χ
P
erio
d
;"AT
Ι Ν
10 -2 or α 500 μ F ca p acitor
. If α p olarize d ca p acitor is use
d ,
observe t
h
e correct
p ola r ity . Use at least α 6
V rated
cap acitor
. Co nnect t h is cap acitor as s
h
ow
n i n F ig . 1-2 .
Duty F actors
Duty factors
greater t han t h ose sp ecifie
d are ob-
taina b le on several ranges . Wh en
t h e du ty facto r is
inc r eased to t h e point
t h at i n ter n al circuitry pr eve n ts
completio n of t h e pulse
waveform, the CO N TRO L ERRO R
lig h t will flas h . To furt h er
i ncrease t he duty factor, switc h
to t h e com p
leme n t m od e . Set t h e D UR ATIO
N control for α
p u lse wi d t h e q ual to t h e d esire d p ulse
off time an d p ush
t h e fro n t p a n el CO MPLE
M E N T (--) pus hb utton :
Delaye d and
P
ai r ed
P ulse Selection
In t h e pu lse d
elay mode, t h e outp ut pulse is d
elayed
from t h e
+TRIG O UT sig n al by t he D EL
AY time selecte d
plus α
specifie d fixed d elay . In t he P AI
RE D mode of
o p eratio n , t he delay controls t h e time betwee
n t he lea d i ng
edges of t h e p ai r ed p u lses . To use
this feature pus h t h e
D ELAY b utto n and
trigger t h e external device from t
h e
+TRIG OUT
j
ac
k . Set t he DE L AY control for t
he d esi r e d
delay time from trigger to p ulse leading
ed ge . Use t he
varia b le co n trol labeled CA L fo r
ti m e a dj ustme n ts
betwee n ste p s o r to increase t
he delay times beyo n d t he
steps .
TRIG/GAT E IN input
imp
edan ce switc h .
F i g .
1-2 . L ocat i on s of pe r io d , d elay and
dur atio n custom timi ng ca p acito
rs and TRIG/GATE IN input im p e da
n ce s w itc h .
R emove t he I npu t b oa r d to gai n access to
t he d elay p ads .
REV . Α ,
A PR . 197 8

Tektronix PG 508 Specifications

General

Brand	Tektronix
Model	PG 508
Category	Pulse Generator
Language	English