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Chapter 2 Function Reference — WFM_Rate
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National Instruments Corporation 2-437 NI-DAQ FRM for PC Compatibles
WFM_Rate
Format
status = WFM_Rate (rate, units, timebase, updateInterval)
Purpose
Converts a waveform generation update rate into the timebase and update-interval values
needed to produce the rate you want.
Parameters
Input
Output
Parameter Discussion
rate is the waveform generation update rate you want. rate is expressed in either pts/s or
seconds per point (s/pt), depending on the value of the units parameter.
Range: Roughly 0.00153 pts/s through 500,000 pts/s or 655 s/pt through 0.000002 s/pt.
units indicates the units used to express rate.
0: pts/s.
1: s/pt.
timebase is a code representing the resolution of the onboard clock signal that the device uses
to produce the update rate you want. You can input the value returned in timebase directly to
WFM_ClockRate. timebase has the following possible values:
–3: 20 MHz clock used as a timebase (50 ms) (E Series only).
–1: 5 MHz clock used as timebase (200 ns resolution) (AT-MIO-16F-5,
AT-MIO-64F-5, and AT-MIO-16X only).
1: 1 MHz clock used as timebase (1 µs resolution) (Am9513-based MIO
devices only).
Name Type Description
rate f64 update rate you want
units i16 units used
Name Type Description
timebase i16 resolution of clock signal
updateInterval u32 number of timebase units