Fluke 8024B - 4.46. Troubleshooting

8024B
6.
Adjust
the
DC
CAL
(R6)
for
a
UUT
display
of
exactly
190.0.
7.
Connect
a
jumper
across
Q10.
8
Push
the
PEAK
HOLD
switch
to
the
ON
position.
9.
Adjust
R17
(Peak
Hold
offset)
for
a
UUT
display
of
exactly
190.0.
10.
Remove
the
jumper
from
across
Q10.
1].
Push
the
PEAK
HOLD
switch
to
the
OFF
position.
12.
Connect
the
equipment
as
shown
in
Figure
4-3.
13.
On
the
UUT,
depress
the
AC/DC
switch.
14.
Program
the
DMM
Calibrator
fora
UUT
input
of
190.0
mV
acrms
at
100
Hz.
15.
Adjust
the
AC
CAL
(R4)
for
a
UUT
display
of
exactly
190.0.
16.
On
the
UUT,
depress
the
2V
range.
17.
Program
the
DMM
Calibrator
for
a
UUT
input
of
1.9V
ac
rms
at
5
kHz.
18.
Adjust
the
HF
CAL
(C1)
for
a
UUT
display
between
1.805
and
1.995.
19.
Establish
a
lag
bath
(ice
point
environment)
as
shown
in
Figure
4-6
and
allow
the
lag
bath
to
sit
for
30
minutes
to
reach
thermal
equilibrium.
20.
Connect
the
Thermocouple
Accessory
to
the
UUT.
21.
Adjust
the
TEMP
CAL
(R10)
fora
UUT
display
the
same
as
the
Temperature
Reference
Monitor
reading.
4-46.
TROUBLESHOOTING
CAUTION
Static
discharge
can
damage
MOS
components
contained
in
the
8024B.
Avoid
instrument
damage
by
complying
with
the
precautions
on
the
Static
Awareness
sheet
when
troubleshooting
or
repairing
the
8024B.
4-47.
Never
remove,
install,
or
otherwise
connect
or
disconnect
components
without
first
turning
the
8024B
POWER
switch
to
OFF.
Table
4-6
is
a
troubleshooting
guide
for
the
8024B.
To
properly
use
the
guide,
complete
the
performance
tests
given
earlier
in
this
section
and
note
any
discrepancies.
Then
locate
the
heading
of
the
procedure
in
question
in
the
Test
and
Symptom
column
(Table
4-6).
Under
that
heading
isolate
the
symptom
that
‘approximates
the
observed
malfunction.
Possible
causes
are
listed
to
the
right
of
the
selected
symptom.
Details
necessary
to
isolate
a
particular
cause
can
be
derived
from
the
Theory
of
Operation
in
Section
3
and
the
schematic
diagrams
in
Section
7.
4-15