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5-5 . ADJU STMENTS
5-6 .
T h e co un ter
r
eq u ir es two ci r cuit a dju stmen ts : T he
B
alance d
I
np u t Amp lifie r
a
dj ustme n t,
and th e Time
B
ase Oscillato r
a
dj ustment .
P
er fo rm these a dju stme n ts acco rd i n g to th e followi n g
p roce dur es :
5-7.
Balanced Inp u t A m p lifie r
5-8 .
T h e in pu t am plifier p ositive and n egative trigge r i n g t hres h old s a r e a dj uste d wit h
t
h e
followi n g
r
ecomme nd ed test equ ipme nt:
HP 180Α Oscillosco pe
HP 1801Α Oscilloscope
P
l u g-i n
HP 651 Β Test Oscillato r
5-9 .
P
e rfo rm th e a dju stme n t as follows :
α .
R
emove t h e to p
a
nd bottom cove r s f r om th e coun te r as
d
escribed in, Pa r ag rap h 5-16 .
Obse r ve WARN I N G
n
ote .
b.
Con n ect t h e oscilloscope to Α 1 ΤΡ 1 of th e
M
ain
B
oa rd Assembly .
ε .
Co nn ect t h e Test Oscillato r 50 O hm
o
u tp u ttot h e f ront
p
anel 50 Ω/1 ΜΩ i n p ut con necto r
of th e coun te r . Set t h e co unter
I
NPU T switc h to 50Ω Χ 1 .
d.
Set th e Test Oscillato r fo r α 1 MH z o u tpu t at α 15 m V level .
e .
Co nn ect AC powe r to t h e co un te r . Observe WA RN IN G
n
ote . Set t h e co un ter
L
I NE
switch to ON .
f .
A dju st t h e oscilloscope sweep time ve rn ie r so t h at o n e cycle tak es up t h e complete wi d t h
of th e oscilloscop e
d
isp lay .
9 .
On t h e cou nter, a dju st
p
otentiomete r A1 R 32
u
ntil t h e sig n al on t h e oscilloscope s hows α
50%
d
uty cycle.
h.
R
e m ove test equ i p ment, ac powe r from
t
he counte r , a nd install the top a nd b ottom
counte r covers pe r P a rag rap h 5-16 .
5-10 . Sta nd ard Time Base Oscillato r A dju stment
5-11 .
Th e stand ard time
b
ase oscillato r is adju ste d wit h
t
h e followi ng test equ i p ment :
HP 5328 Α Un iver sal Co unte r wit h
O
p tio n 10
HP 11048C o r
e
q uivalent 5011
F
ee dthru co nnecto r
O
R
HP 5345Α
E
lectro n ic Co un te r
M o d el 5383 Α
M
ai n te n a n ce
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