Fluke 8506A Instruction Manual page 308

8505A/8506A
6.
Send
the
RO
(10
ohms)
command
again.
7.
Positive gain corrections
are
next stored for
each
OHMS
range.
Refer
to
Table
2
and
select the reference resistance
value
for
the range being
calibrated.
Recommended
values are
shown
(in
parentheses)
in the following procedure. Also
refer to
Table
3 for reference resistance tolerance requirements.
8.
With
the reference resistance for the 10
ohm
range
(20
ohms)
applied
to the
INPUT
HI and
LG
terminals (four wire configuration), allow the
multimeter
to
return
at least
one
reading and
then send:
KNG
(reference numerics)
9.
The
gain correction
is
automatically applied
to
the next reading
in this
range.
Verify proper
reference value entry by observing
that subsequently returned
readings of the reference value equal
that
known
value
±
multimeter accuracy
specifications.
10.
Send
the next higher range
command,
apply an appropriate
reference
resistance value,
allow
the multimeter
to return
at least
one
reading,
and
send
KNG
(reference numerics) once
again.
Repeat
this step
in
sequence
for
each higher
OHMS
range
(total ot eight).
Recommended
reference resistance values are as
follows:
a.
100
ohm
range
(Rl): 200
ohms
b.
1
kohm
range
(R2): 2
kohms
c.
10
kohm
range
(R3): 20
kohms
d.
100
kohm
range
(R4):
200
kohms
e.
1
Mohm
range
(R5): 2
Mohms
f.
10
Mohm
range
(R6): 20
Mohms
g.
100
Mohm
range
(R7): 100
Mohms
1
1.
Remote
resistance calibration
is
complete once
zero corrections
and
positive
gain corrections
have been
entered for
each of
the eight ranges.
12. If
no
further calibration
is
required, disable the Calibration
mode
by
sliding
the
rear
panel switch
to
OFF.
7B"35.
DC
Current
DC
current calibration
procedures
are
very
similar to the
positive
and
negative gain
corrections
used with dc
voltage
calibration.
With
the
multimeter
in local control,
Calibration
mode
can
be enabled by
sliding the rear
panel Calibration switch
to
ON
(AVG/
(CAL)
annunciator
flashes).
Remember
never
to cycle input
power
to the
multimeter
when
the Calibration
mode
is
on.
7B-36.
LOCAL (FRONT
PANEL)
PROCEDURE
Use
the front panel
push
buttons
as follows:
1.
Push
the
ADC
button and manually
select
the lowest (100
uA)dc
current range.
7B-28