USB 6008_Lab View Power Monitor

Hi,
I'm doing a project on Power Monitoring Unit. Here I measure the line voltage and current and display it in the computer using the NI USB 6008 unit.
So I'm giving two signals corresponds to the line voltage and current. Then use Lab View to calculate the power and power factor.
I bought the USB 6008 unit and finding it difficult connect this hard ware to the Lab View software. I need to use the Lab view, not signal express.
If you guys can give me a solution for this, it's greatly appreciated,
Cheers,
Milinda

Hi,
There is another problem that came to me when calculating the Power Factor.
NI USB 6008 measures voltage inputs only.
So, when I calculate the power, I have to measure Voltage and the line current.
For the Voltage input signal, I can use a small transformer to step down the Voltage to an acceptable range with the DAQ. (230 V to 6V)
For the Current input signal, 1) I can use a shunt resistor and measure the voltage difference across it and input it to the DAQ
or 2) I can use the small Current Transformer and a burden resistor get a voltage difference across the burden
Resistor and input it to the DAQ.
If i measure the power of a resistive load, Voltage and Current signal will overlap and gives no difference.
If i measure the power of an inductive or capacitive load, there is a lag or lead between Voltage and Current signal.
My question is, when it's an inductive load, which current input method will display the difference between voltage and current signal?
Note: Power Factor - Angle difference between Voltage and current signal.
Cheers,
Milinda

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Attachments:
monitor2.PNG ‏14 KB
monitor.txt ‏1 KB

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