Fluke 8021B - Page 64

8021
B
Table
4-6.
Troubleshooting
Guide
(cont)
TEST
AND
SYMPTOM
POSSIBLE
CAUSE
Readings
are out
of tolerance
on all
ranges
except
200 mV.
Only
200
mV
range
works
-
other
ranges
read
000.
AC
VOLTAGE
TEST
Displayed
reading
is
out
of
tolerance
on 200
mV
range.
Only
200
mV
range
works
-
other
ranges
read
000.
Readings
are
out
of tolerance
on
ail
ranges
except
200
mV.
DC
CURRENT
TEST
Input
does
not
affect
display.
Displayed
reading
is
out
of
tolerance
on one
or
more
ranges.
CALIBRATION
DC
CAL
pot at limit.
AC
CAL
pot at limit.
Range
resistor
Z1,
23, 24.
R2
-
fusible
resistor
open.
Out
of
calibration
(AC),
AC
converter
defective,
AR1.
R2
-
fusible
resistor
open.
Z1,
Z3,
24,
AR1.
Fuse
FI
and/or
F2
open,
CR1,
CR2.
If
2000
mA
and
200
mA
ranges
are
okay,
Z3 is
defective.
Otherwise
Z
4
is
defective.
VR1,
22, or
R5.
Z5,
CR3,
CR4,
R9,
AR
1
,
dc
calibration
incorrect.
4-12