Tektronix 7704A User Manual

IC's (i n tegrate d circuits)
can be
ch
ec ke d wit
h
α volt-
meter, test oscilloscope, or by d irect s ub stitution . Α
goo d
u nd erstanding of circuit operation is essential to trou b le-
s h ooting circuits usi ng IC's . U se care w hen ch ec k ing
voltages an d waveforms around t he IC's so t h at a d j acent
lea d s are not s ho r te d toget h er . Α convenient means of
clipping α test probe to t h e 14- and 16-pin IC's is wit h an IC
test
cli p . T h
is d evice also doubles as an extraction tool . T he
lea d configuration for t h e semicon
d
u
ctors use d in t h is
instrument are s h own on or ad j ace n t to eac h d iagram
page
.
Β .
DIOD
E
S .
Α d io de can be ch ec k e d for an open or for α sh ort
circ u it b y measuring t h e resistance between te r minals wit h
an oh mmeter set to t he R Χ 1 k scale . T he diode resistance
s hou l d be very hig h in one d irection and very low w hen t h e
meter
lea d s are reversed . Do not c h ec k tunnel dio d es or
back d iodes wit h an o h mmeter .
Do not use an o
h mmete r
scale t h at has αh ig h inter n al
curre n t . H ig h cur r
ents may damage t he diode .
Th e cat h
o
de en d
of
eac h
glass-encase d d io d e is in d icate d
b y α stri p e,
α
series
of stri
p
es, or α d ot .
F
or most silico n or
germa n ium
diodes wit
h
α series of stripes, t h e color-co d e
identifies
t
he
t
h
ree significant d igits of t he Te k tro n ix P art
N um b er using
t
h e
resistor color-co de system (e .g ., α d io d e
color-co d
e p in
k -, or b
lue-,
brow n -gray-green in d icates Te k -
tro n ix P art Nu m b er 152-0185-00)
.
T he cat h ode an d anode
en d s of metal-encase d d
io
d
es can be i d entifie d by t h e diode
symbol mar ked on t he bo d y .
C . RE SISTO RS .
C h ec k t he resistors with an oh mmeter . See t he E
lectrical
P
a r ts L ist for t he tolerance of t h e resistors use d in
t
h is
i nstrument . Resistors normally d o not need to b e re p lace d
unless
t
h e
measure d value varies widely from t h e specified
value .
D . I ND U CTO R S .
Ε .
CA
P
ACITO RS .
C h ec k for o pen in d uctors by c h ec k i ng continuity
wit h
an o h mmeter . S h orte d or partially s h orte d inductors
can
us
u ally
b e foun d b y c h ec k ing t h e waveform res po n se w h en
h ig h -fre
q ue ncy signals are passed t h ro ug h t h e circuit . P artial
s
h
orting ofte n re du ces h ig h -fre quency response (roll-off) .,
Α lea
k y or s
h
orte d ca p acitor can b est be d etecte d b y
ch ec k ing resistance
wit
h
an o h mmeter on t h e h ig h est scale .
REV . Β , JUNE, 1975
Maintenance-7704A Service
Do not excee d t h e voltage rati n g of t h e capacitor . T he
resista n ce reading
s
h oul
d be
h ig h
after
initial
c
h
arge of t
he
capacitor . An open capacitor
ca
n b est b e d etecte d wit h
α
capacitance meter or b y ch ec k ing if t he capacitor passes AC
signals .
8 . Rep air an d R
ea
dj
ust t
h e Circuit . If
any d efective
parts
are locate d , follow
t
he replacement proce d ures given
in t h is section . B e s u re to ch ec k t h e performance of any
circuit t h
at
h
as
b een re p aire d or h a d any electrical compo-
nents replace d .
S p ecial A d j ustment P roce d ures
Several interface ad j ustments are provided in t h e Acqui-
sition U nit to allow use wit h d ifferent Display Un its . It is
not usually necessary to perform t h ese ad j ustments d uring
recali b ration
of
t h e complete system . H owever, if com p o-
nents are replaced in
t
he interface circuits
or
if
t
h e
Ac q uisition U nit
is used
in
α
different system,
ad j
ustment
mig h t
be
re q uired
.
T he need for
a d j
ustme n
t
is i n dicate d if
t
h e vertical
or
h orizontal
a
d j ustments in
t
h e
Display
U nit
cannot be p erforme d accor d i n g to t he Cali b ratio n p ro-
ce du re .
E q ui p me n t R equire d . T he following e q uipment
is
re-
q uired to calibrate t h e Ac q uisition U nit interface :
1 . Test-oscillosco
p
e system
Descri p tion : Differential in pu ts ; freque n cy respo n se, DC
to 30 mega h ertz minimum ; deflection factor, 50 millivolts-
/ d ivisio n .
R
ecommen de d type : Tek tronix 7403 Ν Oscillosco p e
wit h two
7A1 5A Amplifier units or o n e 7 Α 18 Ν Dual-Trace
Amplifier and 7 Β 50 Time- B ase .
2 . Signal Stan d ardizer Cali b ration F ixture
Descri p tion : P roduces gain-c h ec k an d pulse-response
waveforms .
R
ecommen d ed ty p e : Te k tronix 067-0587-01 Calibration
F ixture .
3 . A d apter (two re q uire d )
Description : Ada p ts G R 874 connector to Te k tronix
coaxial connector .
R ecommen d ed ty p e : Te k tro n ix P art No . 017-0093-00 .
3- 5

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English