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Program Description
The instruments are programmed using Direct I/O objects connected as
required by the sequence of SCPI commands. Reading of the HP E1476A
status byte is performed using the
object
I/O | Advanced I/O | Device Event
SPOLL whose action is set to
and its mask set to
. This mask
ANY SET
#H80
allows reading only the OPR bit of the status byte (bit 7) which gets set by
bit 8 (Scan Complete) from the Operation Status Register when the switch
module completes the scan list. Following the detection of scan complete,
the readings are retrieved with the Multimeter's
FETCh?
command and sent
in an array format to an HP VEE
object titled
AlphaNumeric Display
. The readings are also sent to a
Strip Chart
HP E1412A Measurements
Display
object which gives a plot of the measurements.
Strip Chart Object
In parallel with the
HP E1412A Measurements AlphaNumeric Display
object is a
Strip Chart Display
object that displays the readings of the eight
channels. The
has an
button to automatically scale
Strip Chart
Auto Scale
the horizontal and vertical axis to best display the measured data. Upper and
lower boundary traces could be added to the strip chart's display.
Chapter 2
HP E1312A/E1412A Multimeter Application Information
65
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