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Realtime Sampling
In realtime data collection, the CBL 2 sends each data point to the calculator as it is
taken, so some data can be lost if the calculator is not ready to accept the data. In
addition, the quantity of data that can be collected is limited by the size of the
calculator memory.
Realtime data collection is used for:
Slower sampling where the user wants to see the data as it is being collected.
Very long data collection times where the CBL 2 may run out of memory during
data collection.
Situations where the host calculator must process the data as soon as it becomes
available (such as to control an output in response to a temperature input).
This data collection mode should not be used for data collection of more than a few
points each second because the host calculator will not be able to keep up. In addition,
because of the nature of realtime data collection, the period/frequency and Command
12 channels cannot be sampled in this mode.
Since the number of points to be collected may not be known at the start of sampling,
set the "number of samples" to M1 when sending Command 3. This tells the CBL 2 to
take data but not send it to the host calculator until the calculator requests data.
Non-Realtime Sampling
In non-realtime data collection, the samples are taken and stored in the CBL 2 memory
until all the data has been collected. Then the data is sent to the host calculator. The
quantity of data collected is not limited by the size of the calculator memory, but is
limited by the size of the CBL 2 memory. Up to 12,000 samples max (or less under some
conditions) can be collected in non-realtime.
Non-realtime data collection is used for fast sampling of multiple channels and when
triggering is required.
All of the channels can be used in this mode, and the Command 12 functions can be
used. The sample time is limited by the number and types of channels enabled. For a
single channel, the sampling can be as fast as 1
calculator communication is maintained during the sampling. This allows the host
calculator to issue a Command 7 or Command 8 to ascertain the progress of the
sampling without disturbing the sampling process.
FastMode Sampling
FastMode sampling is designed to be used where a single channel must be sampled at
very fast sample times. This mode is used primarily when sampling sound using the
microphone.
6
-4 second. In addition, normal
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CBL 2 Technical Reference
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