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3.
The
error buffer
is
cleared
(set to
00)
when
either of
the following actions occurs:
a.
TheGI command
is
sent.
The
error
is
returned
in
the status
response,
and
the buffer
is
reset to
00.
If
the error
still
exists,
a
new
reading
must
be
triggered
to
reload the error
buffer
(and
return
the
error
message).
If
another
G1
command
is
sent before a
new
reading
is
triggered,
no
error
(00)
is
identified
in
the response.
b.
A
valid
reading
is
triggered.
The
reading
is
returned
and
the buffer
is
reset to 00.
The
multimeter
employs
both
momentary and
latching
errors.
A momentary
error
in
the
buffer
can be
cleared
by
sending
the
G1
command
or
by
triggering
a
valid
reading.
If
the
momentary
error
does
not
reoccur, further
multimeter operation
is
not
impeded.
A
latching
error,
if
not corrected,
does impede
further multirneteroperation
by
generating another
error
(and
returning
the
error
message) each
time a reading
is
triggered.
Clearing the
error buffer
by sending
G1
does
not
affect this
impediment.
Latching
errors
include
12, 13, 14, 15, 19,
and
24.
A
momentary
error
condition
is
illustrated
in
the following
example.
Assume
that
IV dc
is
applied
to
a multimeter
configured
for
dc
volts.
The
following
sequence
of
commands
is
sent:
VR0?
KG1?
R1? The
first
command
(VR0?)
triggers
an
overrange,
causing
the
error
message
to
be
returned.
The
second
command
(KG1
?)
attempts
to
store
this
overrange
as
an
offset,
loads
momentary
error
11 into the error buffer,
and
returns
11 (the
most
recent
error to
be
generated)
in
the
status
response.
The
third
command
(R1?)
triggers
and
returns a
valid
reading
and
resets
the
error
buffer to
00.
A
latching error condition
is
encountered
in
the following
example.
Assume
that
the multimeter
is
configured
for
dc
volts
(V),
but not dc current
measurement
(I),
and IV dc
is
applied
to
the
inputs.
The
following
sequence
of
commands
is
sent:
IR1?
G1?
?
V? The
first
command
(IR1?) triggers
an
invalid
reading, loads the
error buffer with
latching error
19,
and causes
the error
message
to
be
returned.
The
second
command
(G1
?)
returns 19 as the
first
two
characters of
the status
response
and
resets
the error
buffer to
00.
The
third
command
(?)
triggers
another
invalid
reading, loads the error buffer with
19
again,
and
returns the error
message.
The
fourth
command
(V?)
is
valid.
Therefore, the
actual
reading
is
returned,
and
the
error buffer
is
reset to 00.
NOTE
Latching
errors are
enabled
at
all
times
(Calibration
mode
on
or
off)
when
remote
operation
is
in
use.
However,
latching errors
can be
disabled
locally (with
Calibration
mode
on).
This procedure
is
intended
for
use
during troubleshooting
only.
Do
not attempt
to
disable latching errors
at
any
other
time.
The
following additional error conditions
can occupy
the error buffer
for either
the
8505A
or
the 8506A:
1
.
23
:
The
Calibration
Memory
is
faulty
or not
installed.
2.
24
:
Illegal
module
configuration.
This
error
occurs
at
power-up
or
reset.
It
may mean
that
a Calibration
Memory
module
is
installed.
The
8505A
and
8506A do
not
use
a separate
module
for
calibration
memory
entries (calibration
memory
is
a
standard
part of
the Controller
module).
If
a Calibration
Memory
module
is
installed,
it
must
be removed.
Also, error
24
may mean
that
the
wrong
ac converter
configuration
is
installed.
The 8505A
uses
either
the
-01
Option
or the
-09A Option
(not both).
The
8506A
uses only the
Thermal
T rue-RMS
Converter.
If
an
illegal
ac converter
is
installed,
it
must be
removed,
if
the
illegal
configuration
is
not corrected, the error
buffer
is
cleared (G1
sent),
and
a
valid
function
is
subsequently
selected, the
illegal
module
configuration
does
not
interrupt further
multimeter
operation.
However,
if
both ac converters
(-01
and
-09A)
are
installed
in
the
8505A,
the ac
volts
command
(VA
or C)
causes
selection of the
-09A
converter
only.
3.
25
:
The
Calibration
Memory
check
sum
is
wrong.
This
error
condition
may
occur
when
applying power,
when
storing
into
Calibration
Memory,
or
when
recalling
a Calibration
Memory
entry,
it
may
be caused by an
inadvertent cycling
of
power
when
the
multimeter
is
in
the Calibration
mode. Ensure
that
Calibration
mode
is
off,
then
try re-initializing
power
to
the multimeter.
If
error
25 remains,
it
may
be necessary
to
first
clear,
and
then
re-enter,
all
correction
factors,
zero
values,
and
the
calibration
date
(or
instrument
identification
number).
If
error
25 recurs
during the
clearing
procedure
or during
any subsequent programming
attempt, the Calibration
Memory
may
be
faulty.
2A-3I1
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