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Big array in memory


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Hi,

@@karatesever, you are not right - you can average samples for AC signals, and you got the DC component on which AC is superimposed; then subtract the DC from each sample and have the exact AC sample for computing true RMS value.

The only problem to look for is the crest factor for the current needed to be measured.

The sampling process is as described in a previous post.

There is at TI one Design package showing an energy metering instrument which uses a MSP430 and samples only at around 3600 Hz. You can search for that maybe in TIDesigns pages - I will search my archive and post the link for you. The code is in C and may be used in other instruments (and don't even compute the DC, uses another method).

L

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