Fluke 8050A - 4-52. U33 Jumper Selection

MAINTENANCE
CALIBRATION ADJUSTMENTS
Table
4-8. DC
Callbratlon
STEP
RANGE
VOLTAGE
ADJUST
INPUT
DISPLAY
LIMITS
1
2V
+1.9000V
Rl 1
+1.9000
exactly
[j::::>
2
200mV +190.00
mV
R12
+190.00
exactly
3
200V
+190.00V
R5
+190.00
exactly
4 1000V
de
+1000.0V
R6
+1000.0
exactly
[!:::::>If
Rl 1
can
not
be
adjusted to the
DISPLAY
LIMIT,
refer to the
U5
jumper selection
procedures
in
Section
4 of this manual.
Table
4-9. AC Calibration
8050A
VOLTAGE
INPUT
STEP
RANGE
LEVEL
FREQ
ADJUST
DI
SPLAY
LIMITS
1
2V
1.9000V 200
Hz
R7
1.8995 to 1.9005
[1::>
2
2V
100.0
mV
200
Hz
R29
.0999
to
.1001
It:>-
R7
and R29 are interacting adjustments.
Repeat until both
are
within their limits.
3
2V
Short circuit
Less
than
40
digits
@::::>-
4
20V
19.000V 10
kHz
Cl*
18.990
to
19.010
5
200V
100.00V 10
kHz
C2*
99.95 to
100.05
C1
and
C2
are
interacting adjustments. Repeat until both are within their
limits.
*Use
an
insulated screwdriver for these adjustments.
I
I I I
D>
If
R7
cannot
be
adjusted to the
DISPLAY
LIMITS,
refer to the
U33
jumper selecter
procedure
in
Section
4 of this manual.
@::>
If
the display
is
not within limits
in
step 3
or
R29
is
outside adjustment
range
procedure
range, refer to the
RMS
Converter Offset Adjustment procedure
in
Section
4 of
this
manual.
7.
Tum
on
the
DMM
Calibrator.
8.
Compare the
8050A
display
to
the
LOW
and
HIGH display readings
in
Table
4-10
and find
the
DISPLAY
READING
that
the
8050A
display
is
between.
Cut
out
the
portion
of
the
jumper
as
shown
under
the
JUMPER
CONFIGURATION
heading
that
corresponds
to the
DISPLAY
READING.
9.
Perform the Calibration Adjustments.
4-52.
U33
JUMPER
SELECTION
4-53. The
U33
jumper
selection procedure should be
performed if the
RMS
Converter(U32) has been replaced
or
if
R 7 does not have a sufficient adjustment range.
Use
the following procedure to select the
proper
resistance for
U33:
4-10
l.
Using
the
4-pin
connecter
(p
/ n 537522)
provided with the replacement parts kit, short
MP21
jumper
positions E-F-G.
2.
On
the
8050A,
set the
POWER
switch
to
ON.
3.
Adjust R7 fully clockwise and adjust R29 the
center
of
its range.
4.
Select
the AC V function,
2V
range.
5.
Connect the
DMM
Calibrator
to
the 8050A
as
follows:
HI
to
the V
/kO/S
input connector
and
LO to the
COMMON
input connector.
6.
Adjust the
DMM
Calibrator for
l.OOOOV
ac
rms,
at
200Hz.
7.
Tum
on
the
DMM
Calibrator.
8.
Compare the
8050A
display to the
DISPLAY
READING
columns in Table
4-11
and
find
which
LOW and
HIGH
values
that
the 8050A
display reading is between.
Cut
out
the portion
of
the
jumper
as shown under
the
JUMPER
CONFIGURATION
heading
that
corresponds
to the
DISPLAY
READING.
--i--~----,.,.~-