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M
o
d
el 5383Α
Ope
r
atio
n
Pr
oblem Ill .
T
h
e f
r
e
qu
ency co
un
ter is
n
ot co
un
ti
n
g t
h
e in
pu
t sig
n
al .
C
HE
C
K :
α .
Is t
h
e
r
ear pa
n
el ΙΝΤ/ΕΧΤ switc
h
i
n
t
h
e ΙΝΤ positio
n
? (T
h
is switc
h
exists i
n
t
h
e sta
nd
a
rd
co
un
te
r
only .)
b.
Does t
h
is
pr
oblem occ
ur
only w
h
e
n
t
h
e f
r
o
n
t
p
a
n
el I
NPU
T switc
h
is i
n
t
h
e 50 Ω Χ 1
or
1 ΜΩ
Χ 1
p
ositio
n
? T
h
is i
nd
icates t
h
at t
h
e i
n
te
rn
al f
u
se, A1
F
1, is blow
n
.
R
emove i
n
st
r
ume
n
t
cove
r
s to gain access to t
h
is f
u
se (refe
r
to
P
a
r
ag
r
a
ph
5-17,
n
ote WA
RN
I
NG).
R
e
p
lace f
u
se
wit
h
s
p
are p
r
ovi
d
e
d
on t
h
e
M
ain
B
oa
rd
Assembly . Or
d
e
r
a
n
ot
h
e
r
f
u
se (HP
P
art
Nu
mbe
r
2110-0436) .
ΝΟΤΕ
REMEMBER
TO KEEP ΤΗΕ I
NPU
T SIG
N
A
L LEVEL BEL
O
W
3 .5
V
(
RM
S) O
R
+24 D
BM WHEN
ΤΗΕ I
NPU
T S
W
ITC
H
IS IN ΤΗΕ 50 Ω
Χ 1!
ι .
Does t
h
is
pr
oblem occur οηΙ;- w
h
e
n
t
h
e I
NPU
T switc
h
is i
n
t
h
e 1 ΜΩ Χ 1
o r
Χ 10
p
ositio
n
s a
nd
t
h
e i
npu
t f
r
e
qu
ency goes
h
ig
h
e
r
t
h
a
n
100
kH
z?
R
emove t
h
e cove
r
s
(
r
efe
r
to
P
a
r
ag
r
ap
h
5-17, note t
h
e WA
RN
I
NG) .
Set t
h
e
b
oa
rd
-mo
u
nte
d F
I
L
T
ER
switc
h
to t
h
e left (i .e ., away f
r
om t
h
e ">") .
3-12 .
F
inally, t
h
is
q
uic
k
an
d
co
n
ve
n
ie
n
t loop-around c
h
ec
k
is p
r
ovi
d
e
d
to ve
r
ify
n
o
r
mal
o
p
e
r
ation of t
h
e i
n
str
u
m e
n
t :
α .
Set t
h
e rea
r
pa
n
el ΙΝΤ/ΕΧΤ switc
h
(exists on t
h
e sta
nd
a
rd
co
un
te
r
only) to the INT
p
ositio
n
.
b .
Set t
h
e f
r
o
n
t pa
n
el I
NPU
T switc
h
to t
h
e 50 Ω Χ 1
p
osition .
ε .
Co
nn
ect α coaxial ca
b
le
b
etween t
h
e
r
ea
r p
a
n
el OSCI
LL
ATO
R j
ac
k
a
nd
t
h
e f
r
ont
p
a
n
el
I
NPU
T
j
ac
k
.
d .
10 MHz
d
is
p
lay (±1 least-sig
n
ificant
d
igit) i
nd
icates t
h
at t
h
e co
un
te
r
is o
p
e
r
ati
n
g
- -
n
o
r
mally.
e .
F
o
r
loop-around c
h
ec
k
of t
h
e 1ΜΩ Χ1,
or
Χ 10
I
N
P
U
T
p
at
h
s,
u
se α 500
F
ee
d
t
hru
con
n
ecto
r
(see Table 5-1, test 2 items e, f, g .) .
3-13 .
If, afte
r
t
h
ese o
p
e
r
ato
r ch
ec
k
s a
r
e pe
r
fo
r
me
d
, t
h
e cou
n
te
r d
oes
n
ot ope
r
ate no
r
mally,
r
efe
r
to the Troubleshooting C
h
arts :
F
ig
ur
e 5-1 a
nd
5-2 in Sectio
n V
fo
r
fa
u
lt analysis p
r
oce
dur
es .
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