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 8502A 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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