HP 3490A - Page 151

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Check
conriection'
wire)
b۟en
46 at
Troubl6h@t
Filter.
Circuit.
See Note
4.
NO
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NOTES:
1. DC vollmeter
circuits,
including
logic, must
be
oFraling correctly
betore this
procedure
is
attempted.
2. An
ac €librator,
an oscillos@F, and
a
dc voltmeter
are required for these
cnecKs.
3.
The time
shown on
waveforms is @rrect for
instruments designed
fd
60
Hz
line operation.
For
50 Hz instruments, incrEse time
shown by 20%.
4. Afler repairing
the AC
Converter.
check the owrload
protedion
circuits in the
following
mnner:
a.
Set 34904 FUNCTION to
AC,
RANGE
ro 1 V,
SAMPLE
RATE ro FAST,
b. Apply
inpur of'10 V at
100
Hz.
c. Moniroi A6TP1
r
d.
lf
Fw{sm
;s
A6Rt4, t5.
e. M6ue rclEg! i
f. lf 6lbgabrcr(
Ser
FUNCTION
ro AC.
Apply Iull,range
input
at
100 H2 on each
range.
Monitor
convener
output
at white wire.
Should be
+1V 10.002Vforfull-
ßnge Input on each
range,
High
lmpedane
Assy.
montto. pin
18
ol
as
AC
Converter
out-
+l
v
r0.002v
for
ange
input.
Troubleshoot
A6 reed
re.
Select 1
V range and
apply
input
ol 1 V at 100H2.
Monilor
iignal at white
wire connected to lower
end of A6Kl with
s@pe.
Should
be the sme as in-
put
signal at
top end of
A6K1
Apply
Iull-range
inpul
al
10OHz
on
@ch range
nitor A6TP2
g,#h
Troubleshoot
46Kl and
driver
circuil.
See
Note
4.
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