Справочник Пользователя для National Instruments Welding System 321645c-01

Chapter 2

Function Reference — CTR_Rate

NI-DAQ FRM for PC Compatibles

2-104

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 National Instruments Corporation

Converts frequency and duty-cycle values of a selected square wave into the timebase and 
period parameters needed for input to the 

CTR_Square

 function that produces the square 

wave.

freq is the square wave frequency selected in cycles per second (Hz).

Range:

0.0008 through 2,500,000 Hz.

duty is the square wave duty cycle you select as a fraction. With positive output polarity and 
TC toggled output selected, the fraction expressed by duty describes the fraction of a single 
wavelength of the square wave that is logical high.

Range:

0.0 through 1.0 noninclusive (that is, any value between, but not including, 
0.0 and 1.0).

timebase is a code that represents the resolution of the onboard source signal that the counter 
uses to produce the square wave. You can input the value returned by timebase directly to the 

CTR_Square

 function.

1:

1 µs.

2:

10 µs.

f64

frequency selected

f64

duty cycle selected

i16

onboard source signal used

u16

units of time that the square wave is high

u16

units of time that the square wave is low