7.9.14 Measurement: Faster Analog Rates
Certain data acquisition applications require the CR1000 to make analog
measurements at rates faster than once per second (> 1 Hz
(p. 517) ). The CR1000
can make continuous measurements at rates up to 100 Hz, and bursts
(p. 509) of
measurements at rates up to 2000 Hz. Following is a discussion of fast
measurement programming techniques in association with VoltSE(), single-ended
analog voltage measurement instruction. Techniques discussed can also be used
with the following instructions:
VoltSE()
VoltDiff()
TCDiff()
TCSE()
BrFull()
BrFull6W()
BrHalf()
BrHalf3W()
BrHalf4W()
The table Summary of Analog Voltage Measurement Rates (p. 230), summarizes the
programming techniques used to make three classes of fast measurement: 100 Hz
maximum-rate, 600 Hz maximum-rate, and 2000 Hz maximum-rate. 100 Hz
measurements can have a 100% duty cycle
(p. 514). That is, measurements are not
normally suspended to allow processing to catch up. Suspended measurements
equate to lost measurement opportunities and may not be desirable. 600 Hz and
2000 Hz measurements (measurements exceeding 100 Hz) have duty cycles less
than 100%.
229
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