CR1000 Manual - Campbell Scientific

Section 7. Installation
7.8.12.3 Measurement Rate: 601 to 2000 Hz
Table 36. Measuring VoltSE() at 2000 Hz
• 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.
To measure at rates greater than 600 Hz, VoltSE() is switched into burst mode by
placing a dash (-) before the channel number and placing alternate arguments in
other parameters. Alternate arguments are described in the table Parameters for
Analog Burst Mode (p. 236). 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.
PipeLineMode'