Fluke 8506A Instruction Manual page 303

7.
Send
the
next higher range
command,
apply
the appropriate reference value
(at
1
kHz), allow
the multimeter
to return
at least
one
reading,
and
then send
KNG
(reference
numerics) once
again.
8.
Verify gain correction entry by
observing subsequently returned
readings.
9.
Verify
accuracy
at
the higher frequencies
specified
above.
10.
Perform
steps
7, 8,
and
9 for each higher range (R2, R3,
R4).
1 1
.
Remote
ac
volts calibration
is
complete once gain
corrections have been
entered for
each of
the
five
ranges.
If
required,
a
maximum
of
three
sets
of correction
factors
can be
stored
(one
set
each
for
Averaging Converter and
VAC, True-RMS
Converter and
VAC, True-RMS
Converter and
VAC +
VDC).
Just repeat the
entire
procedure with the desired function and
module.
Remember
that the
True-
RMS
Converter
is
always
selected
if
both
ac converters are
installed.
NOTE
If
ac converters are
improperly
interchanged,
software
calibration
is
defeated.
The
calibration correction
factors for each type
of
ac converter
are stored
in the
Controller module.
Therefore,
it
is
possible to
remove
either type of
ac
converter
,
replace
it
with another ac converter
of the
same
type,
and
retain
software calibration factors. But remember,
these factors are unique
to the
combination
of the originally calibrated
ac converter
and
this
multimeter
only.
12.
If
no
further calibration
is
required, disable the Calibration
mode
by
sliding
the rear panel switch
to
OFF.
7B-29.
8
506
A
AC VOLTS
The same
procedure
(1
kHz
reference
signal applied
at
a
level
between 60%
or range
and
full
scale,
reference
level
entered numerically)
is
used
for
each range
in
High Accuracy
mode
for the
8506A. Gain
corrections stored
in
High Accuracy
mode
are
subsequently
applied
in all
ac
volts
modes
(High Accuracy, Enhanced,
or
Normal).
Separate
sets
of
gain corrections can be
stored for
VAC
(VA2)
or
VAC
and
VDC
(C2).
7B-30.
Local (Front Panel) Procedure
Refer
to
Table
2 for the
allowed range of
reference values
and Table
3
for reference source
requirements. Calibration
mode
must
first
be activated (with
the multimeter
in
local
control) by
sliding the rear
panel Calibration switch
to
ON
(AVG/(CAL)
annunciator
flashes).
Remember
never
to cycle input
power
to the multimeter
when
Calibration
mode
is
on.
1.
Select the
ac
volts
high accuracy function
(VAC
HI
ACCUR)
and
100
mV
manual
range.
2.
Select the
appropriate
reference value with
the aid of Table
2.
Recommended
values are as
follows:
a.
100
mV
range: 120
mV @
1
kHz
b.
300
mV
range:
390
mV @
11
kHz
c.
IV
range:
L2V
(a)
1
kHz