Fluke 8021B Instruction Manual page 64

8021
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