Wavetek 188 Instruction Manual page 35

Indica tion: Waveform symme try
1 . contro l s
to
Set i n i t i a l positions ( refe r
may If problem
2 .
symmetry
R90
be adjustment
3 . 5
Perform steps th rough
at
Verify RUN
4 .
s i g n a l
Verity
dial is
U6 pin 4 U6 pin 1 5
5.
and
rotated from 4 . 0 to .004.
6. Ve rify mpl i tud SOR signal
e
a of
7. Check U S . CAB .
Indica tion: Problem on bottom frequency ranges only.
controls
1 . Set to initial
2. Check for 0 Vdc at U "
3. for approximate ly 0 Vdc
Check
Check for 0 Vdc ± S m V at U l 1 p i n 1
4 .
check U 1 ' pin 1 0 for heavy oscilla
5 . 1 00 range;
x
Select
Check
limits). at
6 .
that t h e signa l
(wi thin
saturation
7 . Check for the signal
sa me
u
8 . E re that R93
n s a nd
Scans by Artekmedia
Table 8-8. Symmetry
problem.
Check
to
pa ragraph 6.4).
on O. X l 00 ranges only. problem
x 1 . X ,
appea rs
6-9.
or go to table
1 2 of 6-7. then retu rn to this table.
table
cathode i approximately
s
CR6
from
va ry approximately
at
cathode CR I O
Table 8-9. Capacitance Multiplier
Check
posi tions (refer parag raph
to
pins
2 and 6.
at
U l 1 pi n
1 2.
0.
pin 2 is amplified b y approximately B at pin 1 2
U 1 1
pi ns 6 and 7
at U "
shorted I n the
A94
x
a re
2011
=>
+
3 . 5V.
1 0 to 1 5V as
- -
approx imately
±
is
2V.
6.4).
tions.
at the eminer of 01 1 .
as
1 00 ra nge .
I f Faul ty, Check
ope ration.
Check
for
normal
adjustment.
adjustmen t.
a . R49
b. R44 .
6-1 0.
to tab l e
Go
U 1 , UB. AS2. R53.
Q7 c i rcuit.
a.
b. U7 c i rcu it.
5V supply.
c . +
Corrective Procedure
Check for
no r m a l
ope ra tion
on x 1 K range .
SW2 SW4.
-
ci rcuit ry .
U 1 ,
a . adjustment.
R90
b. U l ,
ci rcui t ry.
C46. U l ' .
c i rcuitry.
U "
SW4 , U l 1 ci rcuitry.
SW4 .
6 - 7