Measurement Computing DaqBook 2000 Series - Manual (Page 63)

Taking Measurements 8
Introduction …… 8-1
Scanning …… 8-1
Triggering …… 8-2
Synchronous I/O Operations…… 8-3
Asynchronous I/O Operations …… 8-7
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
DaqBook/2000 and DaqOEM/2000 Series devices each 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.
DaqBook/2000 and DaqOEM/2000 Series 898695 Taking Measurements 8-1