Tektronix PG 508 User Manual

I n ter n al A dju stme n t Pr oce dure---PG
508
M aintenance
Services Available
Circuit
B
oar d R e m oval
'Tektronix, I n c . p rovi des com p lete instrument repair
an d a dju stme n t at local F ield Service Ce n ters a nd at t he
F actory Service Center . Co n tact your local Te k tro n ix F ield
Office or
R
eprese n tative for furt he r i n fo r matio n .
R efer to t he TM 500-series p ower mo du le man u als
for
complete maintenance i n formation . F
or re
p laceme n
t of
ca m switch contacts, cam switc h re p air k its are available
from Te k tro n ix
.
To obtai n t h e k its, contact yo ur local
Te k tronix F iel
d Office o r r e pr ese n tative .
If tro u ble exists in t he o u tp u t am p lifier,
remove t h e +
and --- trac k i ng power su pp ly ju m pe r s located as sh ow n i n
t he ad j ustme n t locatio n ill u stratio n . T h is completely
isolates t he trac k ing p ower su pp lies from t he o u t pu t
ci
r cuit r y .
To r e m ove t h eo u t p ut circuit boar d an
d gain access to
t h e compo n ents on t h e varia b le tra n sitio n timing
board,
first remove t h e four screws on t h e p lug-in r ear p
a
n
el a
n
d
remove
t h
e p a n el
.
Next remove t he TRA N SITIO N TIME
kn
ob . Disconnect t he coaxial cable p lugs a nd u nplug all
t h e wires
co
nn ected
to
t h
e output or tra n sitio n time
boar ds . Fi n ally, remove t h efourscrewsholding t
h eoutput
boar d to t he plug-in fra m
e
an
d remove t he two boards by
sli d ing toward t h e r ear of t h e p lug-i n un til t he
TRAN-
SITION TIME sh aft clears t he front p a n el h ole .
Now
lift t he
b oards an d remove t h em f r om t he mainframe .
To remove
t h e inp u t b oard remove t h e wi r es an d cables to t h e i np ut
boar d an d t he two screws h ol d ing t he b oar d to t h e ch assis .
To
remove
t he timi ng b oar d , first remove t he rea r pa n el, as
exp lai ned above . T hen remove t h
e PE RIOD, DE L AY, and
D UR ATIO N k nobs from t h eir sh afts . Disconnect
all wires
an d cables leading to t h e timi ng boar d . R
emove
t h
e four
screws h olding t he timi n g board to t h e spacers . Sli de t h e
timing
boar d toward t he rearof t he pl u g-in until t h es h afts
clear t he fro n t p an el an
d
lift t h
e boar d out .
Test E qu ipme n t
F or complete calibratio n of t h eP G 508, t h e
followi ng
equip me n t is recommen ded :
P ower
mo du le wit h fou r compartme n ts or
more,
TEKTRONIX TM 504 .
Digital
voltmeter wit h r an ges greater t han ±26 V,
TEKTRONIX D M 502 or
equivalent (re q uires α TM 500-
series power
module)
.
Digital cou n ter
capa b le of fre quen cies to 51 MHz,
TEKTRONIX DC 504 (requires
α
7°
Μ 500-series p ower
m o du le) .
5 k
Hz to 500 kH z sq u are-wave ge n erato r wit h variable
fre quency
co
n trol
and external triggering cap abilities,
TEKTRONIX P
G 501 (req u ires α TM 500-series power
mo d ule) .
Complete oscillosco pe system, sampling and
real time,
capable of fait h ful re p ro d uctio n to at
least 500 MHz .
TEKTRONIX 5440 mainframe, 5 Α 45 real time vertical
amplifier, 5 Β
42 real time d elayi ng sweep pl u g-i n , a nd
5S14 N sa m pler p lug-i n su
ggeste d .
General
Two flexible p l u g-i n extend er cables, Te k tronix Part
No . 067-0645-02 .
50 Ω

42 inc h coaxial
cab le wit h bnc co nnecto r s,
Te k tronix P art No
. 012-0057-01, or equ ivale n t .
50 Ω te r mination , bnc connectors, Tektronix P art No .
011-0049-01, o r e q uivale n t .
50
Ω
10
Χ
atte nuato r , b nc conn ectors, Te k tronix Part
No . 011-0059-02, or e qu ivale n t .
Bn c female to d ual banana ad apter, Te k tronix P art No .
103-0090-00 .
F or easy access to all ad ju stments, calibrate
t
h
e
P
G 508
u
si
ng t h
e extender cables . M ake certai n t h e cables a n
d
pl u g-in
are p ro p erly co nn ecte d ; top of eac h end of
exten der
cable to to p of p ower mo d ule and to top of pl ug-
in . A dj ustments a r e locate d
on
t h
e outp u t b oar d (rig h t si de
of i n strume n t), period board (left
si d e a nd to p ) a nd
tra n sitio n boar d (t hroug h t he b ottom of t he i n
strument) .
M a k
e ad j ust m en ts at an a m b ie n t temperat u re between
i-20°C and +30°C . R ecomme nd ed recali b ration interval
is 2000 h
ours of o p eration or six mont hs, w h ic hever
occurs first .
O
u tput V oltage Co n trol K no b C h ec k
or
A
d j
ust m
e
n
t
To check or reset t he OU TP U T ( VO L
TS)
co n trol k
nobs,
u se
t
h e followi ng p rocedure . Connect an oscillosco
pe to
t h e P G
508 O U TP U T co nnecto r . Set t h e D UR ATIO N
control to t h e SQ W A VE position, an d t he PER IOD control
at t h e 2
ms p ositio n . Set t h e HIG H L E V E L k nob for
an
o u t p ut level of a b
o
u t
+5
V
on t he oscillosco p e, an d t he
L O W L EVE L for
0
V . If
t he L O W L E VEL kn o b does not
point to 0, loosen t he set screw
an d reset t he kn ob to theO
mar k on t he front panel . Now set t h eL O W
L EVE L k nob for
α readi ng of about -5 V, an d t he H
IG
H
LE V EL for 0V on
t he oscilloscope . If t he H IG H LE V EL kn ob d oes n
ot
point
to 0, loosen t h e
setscrew and rea dj ust .
1 . A d j
ust 5 .2 V Supp ly
Connect t he - Ι - lea d from t he D VM
to
t h
e p oi n t labeled
- Ι
-5 .2 V in t h e ill u stratio n and t h e-- lead
to grou nd . A dj ust
R 1210,
5 .2, for α readi n g of
.
ί -5 .2 V .
2 . Ad j ust 2 μ s Perio d
Con nect t he coaxial ca b le to t he +TRIG
OUT co
n
nec-
tor . Co nn ect t he 50 Ω ter m inatio n to t he ot h e r end of t he
cable an
d co nn ect t he termi n atio n to t he co u nter i n pu t .
Set t he cou n ter
to rea d 500 kH z . Set t he PER IOD con trol
to t he 2 μ s
position
.
M ak e certain t he CA L k no b is f u lly
ccw . Ad j ust R 186, P er, for α
freque ncy of 500 kH z .
3 . A d j ust Sym m et r y
M ai n tai n
t he PER IOD as i n t he p revious step and t he
CA L k nob f u lly
cloc k wise . Co nnect t he +TRIG O U T
t h ro u g h t he coaxial
cable a nd termination to t h e vertical
am p lifier i nput of t he
oscilloscope . Set t h e oscillosco pe
swee p rate so t h at o n e- h alf cycle
of t h e wavefor m is
d isplaye d over most of t h e graticule
. Wh ileswitc h ing from
i- slo p e to -- slo p e
on
t h e oscillosco
pe triggeri n g, a dj ust
R 180, Sym, so t h at t he waveform transitions
occur at
exactly t he same point on t h e oscillosco
p
e graticule
.
R EV . CA PR 197
8

Tektronix PG 508 Specifications

General

Brand	Tektronix
Model	PG 508
Category	Pulse Generator
Language	English