Circuit Diagram for Digital Power Meter

Hi,

you have to decide whether you'd measure the active power (Watt-meter), or the inactive power (VAR-Meter), or both of them in one device. However what you need is to get a voltmeter ,an Ammeter and a tool to help you calculate the phase angle .

i want to measure the active power. actually the current transformer for current measurement and a voltage transformer or a voltage divider for voltage measurement. the two will then have to be given to the ADC of my IC MSP430F5438. i dont know how to go about the circuit for the measurement of current and voltage.

Have you tried the Texas instruments website (specifically the microcontroller utility metering applications section).

http://focus.ti.com/mcu/docs/mcuorphan.tsp?contentId=31498

Lots of helpful design advice and application notes.

ya i did go through the different application notes available on the TI site and i found one which was an e-meter which is what i am looking for. but it is using another IC MSP430FE42X. there are a couple of circuit diagrams in that. i was interested in the one for single phase using current transformer and voltage divider. but i dont know if i can use the same circuit for my IC.

http://focus.ti.com/lit/an/slaa203c/slaa203c.pdf

could you please take a look and tell me.

in the appendix that is page no. 27 there is a circuit for V1+ and V1- and I1+ and I1-. and on pg no. 5 they have shown a circuit diagram. could you please tell me if i can use them?

ok. thankyou very much.