Fluke 8506A Instruction Manual page 301

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
function
(VAC
for either ac converter,
V
AC + VDC
for
True-
RMS
Converter only)
and
the lowest range
(IV
manual).
2.
Select the
appropriate reference value with
the aid
of Table
2.
Recommended
values are as follows:
a.
IV
range:
2V
@
1
kHz
b.
10V
range:
19V
@
1
kHz
c.
100
V
range:
100V
@
1
kHz
d.
1000V
range:
900V
@
1
kHz
3.
Apply
this
value to the
INPUT SENSE
HI
and
LQ
terminals
and
allow the
multimeter
to
take
at least
one
reading.
4.
Now
push
the following buttons:
STORE
(reference
value
numerics)(CAL
COR)
5.
The
multimeter
computes
the gain correction factor
and
automatically
applies
it
to the
next reading
in this
range. Verify
proper
reference value entry
by
observing
that
subsequent readings of the reference value equal
that
known
value
±
accuracy
specifications. If
necessary,
recall
the uncorrected
reading
for
comparison by
using
the
RECALL
(CAL COR)
sequence.
6.
Verify
accuracy
at
higher input
frequencies.
The
required
check
frequencies
(depending on
the type of ac converter)
are as follows:
a.
Averaging Converter (Option
-01),
VAC
only: 10
kHz,
50
kHz,
100
kHz.
b.
True-RMS
Converter (Option
-09 A),
VAC
or
VAC +
VDC:
100
kHz, 500
kHz, and
1
MHz.
7.
Manually increment
the range,
apply
the appropriate reference value
(at
1
kHz),
allow the multimeter
to
return
at least
one
reading,
and
then
push
STORE
(reference
numerics)
(CAL COR)
once
again.
8.
Verify gain correction entry
by
either
observing subsequent readings or using
the
RECALL
(CAL COR)
routine.
9.
Verify
accuracy
at the higher frequencies specified above.
10.
Repeat
steps
7, 8,
and
9 for each higher range (I0V, 100V, 1000V).
1 1.
Front panel 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.