Digital Multimeter - Fluke 8050A Instruction Manual

yAlNTENANCE
ACCESS PROCEDURES
DMM
Calibrator
Digital
Multi-Meter
(DMM)
Calibration
Leads
DC
Voltage 0
to
1000V
+
006%
AC
Voltage
100
Hz
0
to
750V
±.06%
200
Hz
0
to
2V
+06%
1
kHz
0
to
750V
+06%
10
kHz
0
to
100V
+06%
20
kHz
0 to
100V
+
1%
50
kHz
0
to
20V
+5%
DC
Current 0 to
2000
mA +035%
AC
Current 19
mA,
100
Hz
+
1%
Resistance
1000,
1
kO +01%
10 kO. 100
kO
±.005%
1
MO,
10
MO +05%
.1
mV
resolution
24"
Shielded cable with
a
double
banana
plug at
both ends
John
Fluke
Model
51008
John Fluke Model
8020B
Pomona
2BC-24
4-11.
CALIBRATION
ACCESS
4-12.
Use
the following
procedure
to gain access to the
calibration
adjustments
or the
backup
fuse (F2):
1.
Set the
POWER
switch to
OFF.
2.
Remove
the
power
cord
from
the rear
of the
instrument.
3.
Remove
the
screw
located directly
below
the
power
receptacle.
4.
Grasp
the front panel
and
slide
the
instrument
out of the
case.
5.
The
backup
fuse
and
calibration adjustments
are
now
accessible
on
the underside of the
instrument
(as
viewed
from
the front panel).
NOTE
With
the
power
cord replaced, the instrument
is
operational for troubleshooting.
DANGEROUS VOLTAGES
EXIST
ON THE
PCS ASSEMBLIES
WHEN
ENERGIZED.
EXERCISE EXTREME CARE
WHEN
WORKING ON
AN ENERGIZED
CIRCUIT.
6.
To
reassemble, reverse the
previous procedures
in
a logical order.
4-13.
DISPLAY
PCB ACCESS
4-14.
Use
the
following procedure
to access the
Display
PCB
for
troubleshooting:
1.
Complete the Calibration
Access procedure.
2.
Refer
to
Figure 4-1.
Turn
the instrument over
and remove the indicated
screws.
3.
The
LCD,
POWER
switch,
and
RELATIVE
switch are
mounted
on
the
Display
PCB
Assembly. Gently push on
the
LCD
and
POWER
switch, sliding
the
assembly towards
the rear
of the instrument
until
the
LCD
and
the switches clear the front
panel and
the right-
hand
side
pcb edge
slot.
4.
Flip the
Display
PCB
over
on
the right side
of
the
instrument.
The Display
PCB
is
connected
to
the
main pcb
by a flexible
ribbon cable (Interconnect).
This
cable
remains attached
for
service operation.
4-2