Tektronix 2213 - Page 86

T h is section of t he ma nu al contains
infor m ation for con du cting p reve n tive mainten a n ce,
mainte
nan ce on t he 2213 Oscilloscope .
STATIC-S
EN SITI VE
CO
M P O NEN TS
T he followi ng p reca
u tio n s are app licable w h e n pe r -
fo r
ming
any
maintenance i n volvi ng internal access to t he
instr
u ment .
Static disc h arge can d amage a ny semicond
u cto
r
component i n th is i n st r ument .
Th is instrument con tai n s electrical components t h at a r e
susceptible to d amage f r om static d isc h arge . Ta b le 6-1
lists t h e relative susce p ti b ility of va r ious classes of semi-
con d uctors . Static voltages of 1 kV to 30 kV are commo n
in un
p rotecte d envi r onments .
Wh en performi ng mai n tenance observe t he followi ng
p recautions to avoi d com ponent damage :
1 . M inimize h andli
n g
of static-se n
sitive com p on ents .
2 .
Transport an d store static-se n sitive com p one n ts o r
assemb lies
i n
t
h eir o r iginal co n tai ne rs o r on α metal r ail .
L a b
el
any
p
ac
k age t h at con tai n s static-se n sitive components
or assem
b lies .
3 . Disc h arge the static voltage from yo ur bo d y by
wea r
ing
α g
r oun de d a n tistatic wrist stra p w h ile h a nd ling
t h ese
compo n ents . Servicing static-sensitive components or
assemblies s
h
oul d be
performed
only
at α static-f r ee wo rk
statio n b y q
ualifie d service personnel .
4 . N ot h ing capable of
generati n g or h ol d ing α static
ch arge s h oul d b e allowe d on t h e wo rk statio
n
su
r face .
M AI
N T EN A N C E
tr o ub les
h
ooti
n g,
a
nd corrective
Ta b le 6-1
R elative S u sce p tibility to
Static-Disc ha r ge Damage
Sectio n 6-2213 Se r vice
' V oltage equ
ivale n t fo r levels (voltage d isc ha r ge d fr om α 100- pF
capacitor t hr ou g h α r esista n ce of 100
Ω
) :
1 = 100 to
500 V

4 = 500 V

7 = 400 to 1000
V
(est)
2 =
200 to 500 V

5= 400 to 600
V

8=
900 V
3 =
250 V

6= 600 to 800
V

9=
1200 V
5 . K eep t he compone n t lea d s s h o r te d toget h er w
h
enever
possi b
le .
6 . P ic k up com
p onents by th ei r b o d ies, n ever by t h ei r
lea
d
s .
Semicon d uctor Classes
R
elative
S
u
scepti
b ility
L evels'
M OS or C M OS
microcirc u its or
d isc r etes, or li n ear microci r cuits with
M
OS i np uts ( M ost Sen sitive)
1
ECL 2
Sc
h
ott
k y sig n al d iodes 3
Sc
h
ott
k y TT L
4
H ig h -f r e q uen cy b i p ola r transistors
5
JFE T
6
L inea r mic r ocircuits
7
L
ow- p owe r Sch ott ky TT L 8
TT L
( L east Sensitive) 9