Tektronix DC 5010 Anleitung Seite 59

Operating Instructions-DC 501
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OPC (OPERATION COMPLETE)
-
Type:
Setting or Query
Setting Syntax:
OPC
or4
OFF
Examples:
OPC ON
OPC OFF:
Query Synitax:
OPC?
Query Reslponse:
OPC ON;
OPC OFF:;
Discussion:
. -
The OPC command controls the asserting of SRQ when
a measurement is completed. This command allows a con-
troller to start a measurement, and then process some other
task while waiting for an SRQ to inform it that measurement
data is ready.
When OPC is ON and a measurement completes, SRQ is
asserted and remains asserted until the status is read via a
serial poll or until cleared by RQS OFF or a Device Clear.
Operation Complete is indicated by a Status Byte of 66 or
82 and an ERROR query response of ERR 402.
For more Status Byte and ERROR information, see "Er-
ror and Status Reporting".
The Power on initial setting is OPC OFF.
OPC (OPERATION COMPLETE)
OVERFLOW
Type:
Setting or Query
Setting Syntax:
OVER ON
OFF
Examples:
OVER ON
OVERFLOW OFF
Query Syntax:
OVER?
Query Response:
OVER ON;
OVER OFF;
Discussion:
The OVERFLOW command controls the asserting of
SRQ when the internal counting capacity of the DC 5010 is
exceeded. This command allows the controller to detect and
to respond to overflow conditions.
When making measurements, the DC 5010 uses two in-
ternal 43-bit counters, one for Channel A and one for Chan-
nel B.
For EVENTS, FREQUENCY, PERIOD, RATIO, TIME, or
WIDTH measurements, OVERFLOW usually indicates that
one of the input channels is not set up properly.
For TMANUAL and TOTALIZE measurements, OVER-
FLOW can easily be used by the controller to extend the
range of the measurement. When making TMANUAL mea-
surements, an OVERFLOW indicates that the Channel B
counter has counted 243 internal time base pulses
(m87960.9 seconds). When making TOTALIZE measure-
ments, an OVERFLOW indicates that the Channel A
counter has counted 243 ( - 8 . 8 ~ 1 012) on the Channel A in-
put. For both TMANUAL and TOTALIZE, the measurement
result is reset and the measurement continues after an over-
flow is detected.
PROBECOMP and TEST measurements do not gener-
ate overflow conditions.
When OVERFLOW is ON and the instrument's internal
capacity is exceeded, SRQ is asserted and remains assert-
ed until the status is read via a serial poll or until cleared by
RQS OFF or a Device Clear. Channel A overflow is indicated
by a Status Byte of 193 or 209 and an ERROR query re-
sponse of ERR 71 1. Channel B overflow is indicated by a
Status Byte of 194 or 21 0 and an ERROR query response
of ERR 71 2.
The power-on initial state is OVER OFF.
OVERFLOW