Offset Command - Fluke 8505A Instruction Manual

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 waiting
for
the output
to the controller.
NOTE
The from
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 value
may
be entered
by
storing either a previous reading or a numerically entered
offset.
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 IQ
9
to
±
1
X
1G'
9
(including
0.0).
r
P
J
r
P
Offset subtracted (ON).
Offset not subtracted (OFF).
EXTERNAL REFERENCE AND SCALING COMMAND
CHARACTERS
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.
External Reference On,
Scaling Off
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 10
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.