Fluke 8505A Instruction Manual page 68

4.
27
:
Ohms
input
problem
Error
27 can occur under any
of the following circumstances:
a.
At least
one
ohms
input connection
is
open.
b.
An
input polarity reversal
has been
made
in
four-terminal connections.
c.
An
input protection fuse
is
bad.
For
input connections
at either
the
front panel terminals or through
the rear input connector, any
of
the input fuses on
the
Front/Rear Switch
PCB
could be
bad. Either
the front or rear
current/ohms
fuse could
also cause
this
error condition.
The
third
character
of the
G
1
(recall status)
response
is
modified
when
used
with the
8506A
in
an ac
volts
function.
The
third
character (range codes)
is
then defined as
follows:
0
100
mV
3
3V
6
100V
1
300
mV
4 10V
7
500V
2
IV
5
30V
The
fifth
character
(function codes) of the
response
to
61
is
modified
for
the 8506A. Since ac current cannot be
measured
with the 8506A,
the
fifth
character cannot be
defined
as
"S".
Further,
if
the
fifth
character
is
a "1 " (ac
volts)
or a "5" (dc
coupled ac
volts),
the
specific
ac
volts
function
must
also be
identified.
Since sample codes
are not
used
in
8506A
ac
volts functions, the fourth character (Sample)
is
utilized to define
whether normal
mode
(fourth character
=
0),
enhanced mode
(1),
or high
accuracy
mode
(2) is
selected.
Additional Recall
Commands
The
following additional
recall
commands
are
available with either the 8505A
or the 8506A:
1.
G
2
:
Recall multimeter configuration and send on
next
trigger.
This
recall
command
is
useful
in
determining
the multimeter type and
identification
number,
verifying
the
installed
modules
prior to a
performance
test or calibration,
and
identifying the
cause
of
an error24
(illegal
module
configuration).
A
22-character response
identifies the multimeter and
its
hardware
configuration as
follows:
a.
Characters
1-5:
the
model number
(e.g.
8506A)
b.
Characters
6-8: a special
number
(or blank)
c.
Character
9:
a colon
(:)
d.
Characters
10-22:
13 characters
identifying the loaded modules.
D
:
DC
Signal
Conditioner
F
:
Active
Filter
C
:
A/D
Converter
1
:
Averaging
AC
Converter (Option
-01)
2
:
Ohms
Converter (Option -02A)
3
:
Current Converter (Option
-03)
4
:
Not used
(always
=
-)
5
:
IEEE-488
Interface (Option
-05)
6
:
Bit Serial
Interface (Option -06)
7
:
Parallel Interface (OPtion
-07)
8
:
Isolator
9
:
True-RMS
Converter (Option -09A)
A
:
Thermal True-RMS
Converter