Справочник Пользователя для National Instruments Welding System 321645c-01

Chapter 2

Function Reference — DAQ_Rate

NI-DAQ FRM for PC Compatibles

2-132

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 National Instruments Corporation

Converts a DAQ rate into the timebase and sample-interval values needed to produce the rate 
you want.

rate is the DAQ rate you want. The units in which rate is expressed are either points per 
second (pts/s) or seconds per point (s/pt), depending on the value of the units parameter.

Range:

Roughly 0.00153 pts/s through 5,000,000 pts/s or 655 s/pt through 0.000001 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 acquisition rate you want. You can input the value returned by timebase 
directly to 

DAQ_Start

, 

Lab_ISCAN_Start

, or 

SCAN_Start

. timebase has the following 

possible values.

–3:

20 MHz clock used as the timebase (50 ns) (E Series only).

–1:

200 ns (AT-MIO-16F-5, AT-MIO-64F-5, AT-MIO-16X and E Series devices 
only).

f64

desired DAQ rate

i16

pts/s or s/pt (see 

CTR_Rate

)

i16

onboard source signal used

u16

number of timebase units that elapse between 
consecutive A/D conversions