Fluke 8505A - 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