Tektronix PG 508 User Manual

4 . Ad j ust 20 ns P eriod
Co nn ect t he -i- T R IG OUT t hroug h α coaxial cable and
termi
n atio
n
to t he co u nter set to rea d 50 MHz .
M
a
k
e
certai n t he CA L kn ob is in t he fully ccw p osition . C h ange
t h e PERIOD
to
t he 20 ns position .
Now
a dj ust R 195, 20 ns
P er, for α readi ng of 50 MH z .
5 . Ad j ust 1st P eriod 2 μ s
Set t h e
P
ERIOD to 2 μ s a
n
d t h e
D
UR ATIO N to SQ
W A VE . Turn t h
e
P ERIOD
CA
L control fully cw . P
us
h t h e
correct butto n
s
for SY NC GATE an d -+-
S
L O PE operatio n .
Co nn ect t he + T R IG OUT from t he P G 508 to t he vertical
amplifier of t he oscillosco pe . Co nn ect t he trigger ou t p ut
from t he sq uare-wave generator to t h e exter n al trigger
i np ut of t he oscillosco p e real time base . Co n nect t h e
outp ut from t hesq uare-wave gen erator to t h e T R IG/GATE
IN co nnector of t
h
e
P
G 508 . Set t
h
e square-wave
generator for α 5
kH z
square
wave
.
A
dju st
t he TR
IG/
GATE LEVEL co n trol of t h e P G 508 for gated operatio n
.
T he TRIG'D/GATED lig h t will flas
h
w hen t
h
e un it is
properly triggere d . Set t h e oscillosco pe swee p spee d at
50 μ s a nd trigger t hetime base externally fro m t hes q uare-
wave ge n erator . Now ad j ust t h e s q uare-wave ge n erator
variable fre q ue ncy co n trol for α gate d burst of a b out ten
cycles from t h e-+- TRIG OUT co nn ectoro n t he P G 508 .Set
t he d elayed swee p rate for t h etime base at 5μ s and switc h
t he time base to t h e d elayed sweep . U sing t he d elay time
m ultiplier d ial, compare t he period of t h e first and fo u rt h
cycles i n t he burst . Ad j ust R 170 1 P er for α first p erio d
lengt h matc h ing t he fourt h perio d lengt h .
6 . Ad j ust 1st P erio d 20 n s .
C h ange t h e PER IOD to 20 ns . Turn t he PER IOD CA L
con trol fully cw . Set t he sq uare-wave fre q uen cy to
500 kH z . Install t h e sampling p lug-i n and connect t h e
- Ι -T R IG O U T t hroug h t he coaxial cablea n d terminatio n to
t he sampling p l u g-in in p ut . Connect t h e sq u are-wave
gen erator trigger out pu t to t h e external trigger in p ut of t h e
sam p li ng un it . Set t he delayed swee p time to 0 .5 μ s (mai n
sweep time 0 .5 μ s) an d ad ju st t he frequency variable
control
on
t h
e sq
u are-wave generator
for
α bu rst
of
a b
o
u t
te
n cycles
. Now switc
h t h
e delayed swee p
time
to 50
n
s .
U se t h e d elay ti m e multiplier to compare t he perio d s
of
t h e
first a nd fourt h cycles in t he b urst measure d at t he 50 ο /ο
points . If n ecessary, a dju st R 165, 20 ns 1 P er for α first
p eriod le n gt h matc h i ng t he fourt h p erio d le n gt h .
7
.
A
d j ust 1 μ s Duration
C han ge t h e D UR ATIO N switc h to 1 μ s . M ake certai n
t h e variable co
n
trol is fully ccw . C h ange t he PER IOD to
2 μ s an d ma k e certain t he variable
control is
fully
ccw
.
Co nnect t he O U T PU T to t he sam p li n g u n it's vertical i np ut
and t he + TR IG
OUT
to t he sampling un it's external trigger
i np ut . M a k e certai n t h e TRA N SITIO N
TIME
is in t h e 5 ns
p ositio n a nd t he LE ADI NG and T R AI L I NG controls are
fully ccw . P ush t he M OD Eb utto n placi ng t he P G 508 i n
t h e UN D L Y mo d e ; all ot h er pus hb uttons out . Set t he
swee p rate at 0 .2 μ s . Set t he O U T PU T L O W an d HIG H
L E V E L controls for α convenie n t vertical deflectio n of t he
oscilloscope trace . Νοω
ad ju st
R
470, Dur 1 μ s, fora p ulse
duratio n (on time) of exactly five h orizontal divisions .
Leave all connections as t hey are for t he next ste p .
8 . A d j ust 10 ns Duration
U sing t he same setu p as i n t he p revious step, ch a nge
t he PER IOD to 20 ns an d t h e D UR ATIO N to 10 ns . Set t he
p erio d variable (CA L ) kn ob about 45° from t h e fully ccw
p ositio n . C h a n ge t he sweep rate to 2 ns per d ivisio n . Now
a dj ust R 465, Dur 10 ns, fora duration of 10 n s meas u re d at
t he 50 ο/ο poi n ts
on
t he waveform .
9 . Ad j ust Delay
Set t h ePER IOD to 2 μ s and t h e D UR ATIO N to .1 μs .
M ake certai n t he CA L controls are fully ccw . Set t he
D EL AY to 1 μ s . C h ange t he sweep rate to 0 .2 μ s per
division
. L
eave all ot h er co n trols as i n t he p revious ste p .
N ote t he time positio n of t he pulse on t he oscillosco pe .
Now push t he M OD E D EL AY b utto n an
d
a dju st R 352, Del,
for α p ulse delayed exactly 1 μ s (five divisions) from t he
p revious pulse .
10 . Ad j ust B otto m L evel Cla mp
Con n ect
t h
e 10
Χ
atte n uator betwee n t he coaxial cable
from t h e O U TP U T con n ector an d t he sampling os-
cillosco pe input so t h at α 10 V ρ - ρ signal can conveniently
be d is p layed, on t h e oscillosco pe . Set t he O U TP U T
( V O L TS) H IG H and L O W LEVEL controls foradisplay of-+-
and --5 V (maxim u m outp ut) . Set t he PER IOD to 2 μ s an d
t h eD UR ATIO N to1 μ s . Set t h e TRA N SITIO N TIME t ο 5 ns
and turn t h
e
L EADI N
G and
TRAI L I
NG variable controls
fully cw .
L
eave t he ot h er co n trols as i n t he p revious step .
Set t h e
oscillosco pe for α 0 .2
μ
s swee p rate . Ad j ust
R
570,
B ot L vl Clamp, until t h e transition from t h e b ottom of t h e
waveform to t he leadi n g transitio n p ortio n
of
t h e waveform
is li near . Impropersetti ng of t h is a dj ustme n t causes eit h er
α fast step at t he start of t he leadi ng tra n sitio n or α time
extension of t he tra n sitio n start .
11 . A dj ust Top L evel Clam p
Leave
all
controls as i n t h e previous ste
p .
A dj
ust
R
615,
Top L vl Clam p until t he transitio n from t he top of t he
waveform to t he traili n g tra n sitio n is li n ea r . Im p ro pe r
setti ng of t h is a dju stment causes eit h er α fast fall at t he
start of t
h
e trailing transition or α time exte n sio n of t he
tra n sitio n start .
12 . A d j ust L ea d ing Transition Ti m e
Turn t h e L EADI NG and TRAI L I NG controls fully ccw .
C han ge t he 'TRANSITION TIME to 0 .5 μ s and t he os-
cillosco pe sweep speed to 0 .1 μ s . L eave all ot h er co n trols
as in t he previous step . Ad j ust t he oscilloscope sweep so
t h at t he lea d i ng waveform transition is visible on t h e crt .
A dj ust R 650, Set L eading, for α leadi ng transitio n time of
0 .5 μ s measure d from t he 10 ο /ο to t he 90 ο/ο points of t h e
waveform t r an sitio n .
13
. Ad j ust Trailing T ransition Time
A dju st t he oscillosco pe swee p so t h at t h e trailing
tra n sitio n is visible on t he crt . A d j ust R 542, Set Traili n g, for
α traili n g
transitio n time of 0 .5 μ s measure d from t he 10 ο/ο
to t h e 90 ο / ο p ortion of t he transitio
n time .

Tektronix PG 508 Specifications

General

Brand	Tektronix
Model	PG 508
Category	Pulse Generator
Language	English