duty cycle measure

[yugant7]

Hello,

I am trying to measure a PWM duty cycle using  DC values, can anyone help me, if my PWM is 200 Hz  10V , what should i use on  LabVIEW  in order to estimate the PWM duty cycle .

thank you IM USING PXI-4065

[santo_13]

PXI-4065 does not have any circuitry to measure the duty cycle. On the other hand, you can use the DMM in digitizer mode, capture the waveform and calculate the duty cycle in the software layer.

Another approach I would use is to set the aperture time to match 5ms (200Hz), measure voltage. Since you already know that the amplitude is 10V, any averaged voltage you measure in 5ms is duty cycle x 10V. For instance, if you measure 1V, it means, duty cycle is 10% and so on.

[JÞB]

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@yugant7 wrote:

Hello,

I am trying to measure a PWM duty cycle using  DC values, can anyone help me, if my PWM is 200 Hz  10V , what should i use on  LabVIEW  in order to estimate the PWM duty cycle .

thank you IM USING PXI-4065

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It doesn't matter what hardware you are using 

Vrms = Vpk * (100 * DC)  

So, you only need Vpk = 10 and Vrms to CALCULATE Duty Cycle!

You might a also need algebra 101