Rms Converter Dc Offset Adjustment; Ac Calibration Adjustment; Lo Range Calibration Adjustment - Fluke 8010A Instruction Manual

MAINTENANCE
CALIBRATION
PROCEDURE
4.
On
the
UUT,
adjust
R4 (DC CAL)
for a display
reading of exactly
"1.888".
5.
Reverse
the input leads
(V/kH/S
and
COMMON)
on
the
UUT.
Verify that the
display
reading
is
between
"-1.887"
and
"-1.889".
6. If
necessary, adjust
R4
until
the readings of
Step 4 and
5 are within
1
digit
of 1.888V.
4-54.
RMS
Converter
DC
Offset
Adjustment
4-55.
Use
the following
procedure
to adjust the
dc
offset
of the
rms
converter:
1.
On
the
UUT,
select the
AC
V
function, any
range.
2.
Connect
the
Low Ohms
Calibration
Lead
between the
V/kO/S
and
COMMON
input
terminals.
3.
Measure and
record the voltage
level
on
TPl
using the
DMM.
Verify that the
level
at
TPl
is
between -20
mV
and
20
mV.
4.
Connect
the
DMM
to
TP2.
5.
Adjust
R7
on
the
rms hybrid
network
so that
the voltage
level
on
TP2
is
within
0.5
mV
of the
level
recorded
on TPl.
4-56.
AC
Calibration
Adjustment
4-57.
There
are four interacting
adjustments
in this
procedure.
Two
potentiometers
set
the
low and
high
levels at
low
frequencies,
and two
variable capacitors set
the high
levels
at high frequency.
Use
the following
procedure to calibrate
AC
Voltage and
AC
Current
functions:
1.
On
the
UUT,
select
AC
V,
2V
range.
2.
Set the
DMM
Calibrator for
an
output of
1.900V
at
a frequency of 100
Hz.
3.
Connect
the
HI
output of the
DMM
Calibrator
to the
V
/kfl/
S input of the
UUT.
Connect
the
LO
output
of the
DMM
Calibrator
to the
COMMON
input of the
UUT.
4.
Adjust
R19 (AC
HI)
for
a display reading of
exactly "1.900".
5.
Set the
DMM
Calibrator for an output of
190.0
mV
at
100 Hz.
6.
Adjust
R21
(AC
LO)
for
a
display
reading of
exactly ".190".
7.
The
adjustments of
R19
and
R21
interact.
Repeat
steps
1
through
6 of
this
procedure
until
both
readings are within
1
count
of the
designated values.
8.
On
the
UUT,
select
the
20V
range.
9.
Set the
DMM
Calibrator for
an
output
of
19.00V
at
a frequency of 10
kHz.
10.
Adjust
Cl
for
a
display
reading of
exactly
"19.00".
11.
On
the
UUT,
select
the
200V
range.
12.
Set the
DMM
Calibrator for
an
output of
IIO.OV
at
a frequency
of 10
kHz.
13.
Adjust
C4
for
a
display
reading of exactly
"
110
.
0
".
14. If
any adjustments were
made
in this
procedure, repeat Steps
1
through
13.
4-58.
LO
RANGE O
Calibration
Adjustment (8012A
Only)
4-59.
Use
the following
procedure
to calibrate the
circuits
of the
LO
RANGE
O
function:
1.
On
the
UUT,
select
the
LO
RANGE
O
function, 20
fl
range.
2.
On
the
UUT,
connect
the
Low Ohms
Calibration
Lead between
the
COMMON
and
LO
RANGE
fl
input
terminals.
3.
Adjust
the front panel
ZERO
control
until the
display
reading
is all
zeros.
4.
Remove
the
Low Ohms
Calibration
Lead from
the
COMMON
terminal,
plug
the
1
9fl
Test Set
into the
COMMON
terminal
and
plug
the
Low
Ohms
Calibration
Lead
into
the 19fl Test
Set.
5.
Adjust
R57
for
an
display
reading of
exactly
"19.00".
6.
Replace the 19fl
Test Set with the
1.9fl
Test
Set.
7.
On
the
UUT,
select
the 2fl range.
8.
Verify that the display
reading
is
between
"1.879" and "1.921".
4-9