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8500
Series
External
Reference
Off,
Scaling Off
External
Reference
Off,
Scaling
On
The
"XI" Scaling
mode
will
divide
all
readings by a
previously
taken
external reference voltage or
by
a
previously
entered
numeric
scale
factor.
The
read
valued
may
not
be used as
a scaling
factor.
NOTE
The 8502
A
can
store the
external
reference voltage
and
the
numerical
scale
factor
separately.
The 8500A
can
only
store
one
or
the
other,
not
both.
Minimum
scaling factor
=
the
same
as the
minimum
Vxref, for
the
8500A.
For
the
8502A
minimum
=
10'
9
.
Factors
less
than
this
will
be
set to
0,
which
is
not a
valid
scale
factor.
Maximum
scaling factor
=
±100
(8500A), or
Input/Max
Scale
factor
CIO'
9
(8502A).
NOTE
The "X"
and
"XI"
modes
are
mutually
exclusive.
LIMITS
AMD
PEAKS
COMMAND
CHARACTERS
The
"U"
command
characters specify selection of
Limits or
Peaks modes.
Limits Testing
On
When
this
command
character
is
sent,
each
instrument
reading
is
compared
to
upper and
lower
limits.
Limit
values
must be
entered
separately with
a
keep
command
(refer to
KEEP
COMMAND
CHARACTERS).
The
output format
from
the instrument
(when
given a
"G"
command)
is
as
follows:
"0"
is
transmitted
for
a reading
within
limits.
"1"
is
transmitted
for
a
reading
greater
than the
upper
limit.
"-1"
is
transmitted
for
a
reading
less
than the lower
limit.
v
a
v
J
Disable Limits
and
Peak Mode(s)
Save
Highest
and Lowest
Values {Peaks
On)
"2"
is
transmitted
if
an
error
occurs
(e.g.,
overranging).
Previous
peak
values are erased from
memory
whenever
the
"U1"
command
character
is
programmed.
2A-13
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