Taking Measurements 8 Introduction …… 8-1
Scanning …… 8-1
Triggering …… 8-2
Synchronous I/O Operations…… 8-3
Asynchronous I/O Operations …… 8-5
Synchronizing Multiple Units …… 8-6
Using DBK Cards and Modules for Signal Conditioning ….. 8-8
Introduction
With signal lines connected and a system up and running you can begin acquiring data.
Specific connector details and pinouts are provided in chapter 4. You should refer to the
software documentation applicable to your data acquisition system, for example, DaqView.
Scanning
DaqScan/2000 Series devices have an on-board scan sequencer that permits the user to select
any combination of up to 16384 channel/range combinations. The sequencer scans all
channels contained in the sequence at the rate of 5 µs/channel, 10 µs/channel, or
1000 µs/channel, depending on the speed of the DBK expansion options; thereby minimizing
the time-skew from channel-to-channel. The user can also set the time between scan groups,
from 0 to 6 hours. In addition to scanning analog inputs, the sequencer can scan digital inputs
and counter inputs.
Digital and frequency inputs can be scanned using the same scan sequencer employed for
analog inputs, enabling the time correlation of acquired digital data to acquired analog data.
(See Note)
5µs, 10µs, or 1000µs
(See Note)
Scanning Example
Note: All inputs can be measured at the 5 µs/channel rate. Some DBK expansion options require more
settling time and can be measured at the slower rate of 10 µs/channel or 1000 µs/channel. All
types of measurements can be mixed within the scan group.
DaqScan/2000 Series 898095 Taking Measurements 8-1