Fluke 8506A Instruction Manual page 68

8500
Series
Table
2A-1. Programming
Instructions (coni)
When
each reading
is
accepted by
the instrument
controller,
the next reading
will
be
started.
An
exception
to
this
sequence occurs
in
the "J1"
Suppress Output mode;
the next reading
will
now
be taken
immediately,
without
v/aiting
for the
output
to
the
controller.
NOTE
The front panel
display
does not update
in this
mode
unless the controller asks
for a
reading.
Use
of
the
"%"
character
will halt
the
Continuous Reading
mode
and
cycle the
unit
back
to
the Single
Reading
mode.
OFFSET
COMMAND CHARACTERS
The
"P"
command
characters specify
whether an
offset
will
be subtracted from
a reading.
The
offset
vaiue
may
be
entered
by storing either a previous reading
or a numerically entered
offset.
4k
When
storing
readings, the
8500A
will
store the
unprocessed
reading,
and
the
8502A
will
store the displayed
value.
Offset values
may
range from ±1
X
10
9
to
±
1
X
10~ 9
(including
0.0).
Offset
subtracted (ON).
0
)
Offset not subtracted (OFF).
The
"X"
command
characters select External
Reference or Scaling
mode.
Either
mode
is
valid for
any
function
and
range.
In
External
Reference mode,
readings are divided
by
the
signed
magnitude
of
the external reference
voltage.
In
Scaling
mode,
readings are divided by a numerically entered scale factor or
by a previously read
value.
The
"X" External Reference
mode
uses the external
reference voltage (Vxref) to divide
the
measured
voltage. Vxref
is
measured
during
each reading
cycle.
$
Minimum
Vxref
=
±0.0001
V
or
the
input divided
by the
maximum
display with the volts range,
whichever
is
greater
(8500A
only),
^
For
the
8502A,
the
minimum
Vxref
is
the input divided
by !Q
9
.
Maximum
Vxref
=
±40V
between
Ext
Ref
Hi
and Lo
terminals,
providing
neither terminal
is
greater
than
±20V
relative
to the
Sense Lo
or
Ohms
Guard
Terminals.
External
Reference On, Seating
Off
2A-12