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07-14-2009 10:34 PM

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I am trying to derive the kWh from the sun's radiation using a Kipp&Zonen CMP11.

I have sampled readings from the CMP 11 (which is in Watt per square meter) using an agillent mux. Now I have to integrate it over the accumulating time to get the Watt-hour. Which function can I use? Can I use the Time-Domain Integration vi SUM[X(dt)]?

07-15-2009 03:24 AM

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07-15-2009 03:55 AM

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Thank you,

I forgot to mention that I am doing real-time sampling and accumulating the kWh continuously.

I tried the Integral (Sum[Xdt]), also in the math palette, and seemed rather straight forward to implement. I have not seen anyone use this vi for this purpose, perhaps its a new feature in Labview?

I am not certain of how to use the Numeric Integr VI for the same purpose. What do I use for dt (interval size)? The sampling period?

07-15-2009 04:18 AM

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Which VI do you use? The Integral x(t) VI?

Yes, dt is sampling period.

07-15-2009 04:29 AM

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This is what I used. Its in the math > Integr & Diff > Time-Domain Math

07-15-2009 09:43 AM

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I see.

You said you are doing real-time sampling and accumulating the kWh continuously.

Do you mean point-by-point? That is, every time you get a sample data input, you want to calculate the integral?

If so, you can use Integral x(t) PtbyPt.vi, which is in Signal Processing >> Point By Point >> Integral & Differential PtbyPt palette.

07-20-2012 12:58 PM

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