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.
To Next Page
Loading...
