Tektronix 434, Инструкция по эксплуатации

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4 3 4
S E C T I O N 5
C A L I B R A T I O N
Change in fo rm a tio n , i f any, a ffe c tin g th is section w ill be fo u n d a t the re a r o f th is m anual.
In tro d u c tio n
T o assure in s tru m e n t accuracy, check the c a lib ra tio n o f
th e 4 3 4 every 1000 hours o f o p e ra tio n , o r every six m o n th s
if used in fre q u e n tly . B efore c o m p le te c a lib ra tio n , th o r ­
o u g h ly clean and inspect th is in s tru m e n t as o u tlin e d in the
M aintenance section.
T e k tro n ix Field Service
T e k tro n ix , Inc. provides c o m p le te in s tru m e n t repair and
re c a lib ra tio n at local F ie ld Service Centers and the F a c to ry
Service C enter. C o n ta c t y o u r local T e k tro n ix F ie ld O ffic e
or representative fo r fu r th e r in fo rm a tio n .
Using This Procedure
T o aid in lo ca tin g a step in the C a lib ra tio n p rocedure, an
index is given p rio r to th e c o m p le te p rocedure. C o m p le tio n
o f each step in the fu ll C a lib ra tio n p rocedure insures th a t
th is in s tru m e n t meets th e e le ctrica l sp e cifica tion s given in
S ection
1. Where possible, in s tru m e n t p e rfo rm a n ce is
checked b e fo re an a d ju s tm e n t is made. F o r best overall
in s tru m e n t pe rfo rm a n ce w hen p e rfo rm in g a c o m p le te c a li­
b ra tio n p ro ce d u re , m ake each a d ju s tm e n t to the exact
setting even if the C H E C K — is w ith in the a llo w a b le to le r ­
ance.
A p a rtia l c a lib ra tio n is o fte n desirable a fte r replacing
co m p o n e n ts, or to to u c h up the a d ju s tm e n t o f a p o rtio n o f
the in s tru m e n t betw een m a jo r re c a lib ra tio n . T o ad ju st o n ly
p a rt o f the in s tru m e n t, set the c o n tro ls as given u n d e r
P re lim in a ry C o n tro l S ettings and sta rt w ith the nearest
E q u ip m e n t R equired L is t preceding the desired p o rtio n . T o
p revent unnecessary re c a lib ra tio n o f o th e r parts o f the
in s tru m e n t, readjust o n ly if the tolerance given in the
C H E C K — p a rt o f th e step is n o t m e t. If re -a d ju stm e n t is
necessary, also check th e c a lib ra tio n o f any steps listed in
the IN T E R A C T IO N — p a rt o f th e step.
IM P O R T A N T N O T E
AH w aveform s show n in th is p ro c e d u re were taken
w ith a T e k tro n ix O scilloscope Camera S ystem , unless
o th e rw ise n o te d . L im its , tolerances, a n d w aveform s in
th is p ro c e d u re are given as c a lib ra tio n guides a n d
s h o u ld n o t be in te rp re te d as in s tru m e n t s p e c ific a tio n s
e x c e p t as s p e c ifie d in S e ctio n 1.
TEST E Q U IP M E N T R E Q U IR E D
General
T he fo llo w in g test e q u ip m e n t and accessories, or th e ir
e q u iva le n t, are requ ire d fo r c o m p le te c a lib ra tio n o f the
4 3 4 . S p e c ific a tio n s given fo r the test e q u ip m e n t are the
m in im u m necessary fo r accurate c a lib ra tio n . T h e re fo re , the
sp e c ific a tio n s o f any test e q u ip m e n t used m u st meet o r
exceed th e listed sp e cifica tion s. A ll te s t e q u ip m e n t is
assumed to be c o rre c tly c a lib ra te d and opera tin g w ith in th e
listed s p e cifica tion s. D etailed o p e ra tin g in s tru c tio n s fo r the
test e q u ip m e n t are n o t given in th is p rocedure. R efer to the
in s tru c tio n m anual fo r th e test e q u ip m e n t if m ore in fo rm a ­
tio n is needed.
Special C a lib ra tio n F ixtu re s
Special T e k tro n ix c a lib ra tio n fix tu re s are used in th is
procedure o n ly w here th e y fa c ilita te in s tru m e n t c a lib ra tio n .
T h e s e special c a lib ra tio n fix tu re s are available fro m
T e k tro n ix , Inc. O rder b y p a rt n u m b e r th ro u g h y o u r local
T e k tro n ix F ie ld O ffic e o r representative.
C a lib ra tio n E q u ip m e n t A lternatives
A ll o f the listed te st e q u ip m e n t is required to c o m p le te ly
ca lib ra te th is in s tru m e n t. The C a lib ra tio n procedure is
based on th e fir s t item o f e q u ip m e n t given as an exam ple o f
ap p lica b le e q u ip m e n t. W hen o th e r e q u ip m e n t is su b sti­
tu te d , c o n tro l settings o r c a lib ra tio n setup m ay need to be
altered s lig h tly to m eet th e requirem ents o f the s u b s titu te
e q u ip m e n t. I f th e exact item o f test e q u ip m e n t given as an
exam ple in the Test E q u ip m e n t lis t is n o t available, firs t
check th e S p e cifica tio n s c o lu m n c a re fu lly to see i f any
o th e r e q u ip m e n t is available w h ic h m ig h t s u ffic e . Then
check th e Usage c o lu m n to see w h a t th is ite m o f the test
e q u ip m e n t is used fo r. If used fo r a check or a d ju stm e n t
w h ic h is o f little or no im p o rta n ce to y o u r m easurem ent
re q u ire m e n ts, th e item and corre sp o nd in g step(s) can be
deleted.
The fo llo w in g procedure is w ritte n to c o m p le te ly check
and ad ju st th e 4 3 4 to th e P erform ance R equirem ents given
in S e ctio n 1. I f th e a p p lic a tio n s fo r w h ic h yo u w ill use the
43 4 d o n o t require th e fu ll available pe rfo rm a n ce fro m the
4 3 4 , th is procedure and th e required e q u ip m e n t lis t can be
s h o rte n e d a cco rd in g ly . F or exam ple, o n ly the basic
m easurem ent c a p a b ilitie s o f th is in s tru m e n t can be ve rifie d
by checking ve rtica l d e fle c tio n accuracy w ith a S tandard
A m p litu d e C a lib ra to r, v e rtic a l square-wave response w ith
fast-rise Square-Wave G e nerator (such as th e T e k tro n ix
T y p e 106), and the h o riz o n ta l tim in g using a T im e -M a rk
G enerator.
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