Omega 1002 Manuale Utente
Before performing A/D conversions, the JP1 jumper should be set for single-ended or
differential.
The software driver supports both polling and interrupt driven A/D, however, polling
is the simplest way to perform an A/D conversion.
The settling time of multiplexer depends on the impedance of the signal source.
Because the driver does not incorporate the settling time, the user needs to program a
delay when switching from one channel to another or when changing gains.
delay when switching from one channel to another or when changing gains.
Suggested Settling Times
One settling time is suggested for all ranges of the OME-PCI-1002L. The settling time
for the OME-PCI-1002H is based on the analog input range. The table below shows the
suggested settling times for each range.
OME-PCI-1002L Settling Time: 33
One settling time is suggested for all ranges of the OME-PCI-1002L. The settling time
for the OME-PCI-1002H is based on the analog input range. The table below shows the
suggested settling times for each range.
OME-PCI-1002L Settling Time: 33
µseconds for all ranges
OME-PCI-1002H Settling Time
Input Range
Settling Time
± 10V
23
µS
± 5V
28
µS
± 0.1V
140
µS
± 0.01V
1300
µS
The software driver provides a machine independent timer, P1002_Delay(), for
settling time delay. If the user calls P1002_Delay(), counter 0 will be reserved and can
not be used as a user programmable timer/counter.
not be used as a user programmable timer/counter.
The A/D converter requires a trigger signal to start an A/D conversion cycle. The
OME-PCI-1002 supports three trigger modes, software, pacer and external trigger.
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