Campbell Scientific CR6 CR6 Measurement and Control System - Page 234
Measurement Rate: 601 to 2000 Hz
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Section 7. Installation set the delay for the main scan, processing is delayed until this point (20 ms in the above example). So more memory is required for the raw buffer space for the sub-scan mode to run at the same speed as the non-sub-scan mode, and there will be more delay before all the processing is complete for the burst. The pipeline (the raw buffer) has to fill further before processing can start. • One more way to view sub-scans is that they are a convenient (and only) way to put a loop around a set of measurements. SubScan() / NextSubScan specifies a timed loop for so many times around a set of measurements that can be driven by the task sequencer. 7.9.14.3 Measurement Rate: 601 to 2000 Hz To measure at rates greater than 600 Hz, VoltSE() is switched into burst mode by placing a dash (-) before argument in SEChan parameter argument and placing alternate arguments in other parameters. Alternate arguments are described in the table Parameters for Analog Burst Mode (p. 234). In burst mode, VoltSE() dwells on a single channel and measures it at rates up to 2000 Hz, as demonstrated in the CRBasic example Measuring VoltSE() at 2000 Hz. The example program has an 86% duty cycle. That is, it makes measurements over only the leading 86% of the scan. Note that burst mode places all measurements for a given burst in a single variable array and stores the array in a single (but very long!) record in the data table. The exact sampling interval is calculated as, Tsample = 1.085069 * INT((SettleUSEC / 1.085069) + 0.5 where SettleUSEC is the sample interval (µs) entered in the SettlingTime parameter of the analog input instruction. CRBasic Example 48. Measuring VoltSE() at 2000 Hz PipeLineMode'
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