Hello,
I am using the latest version of LabVIEW and a NI PXIe-1062Q with two PXI 4071 DMM Cards to measure input AC Voltage and Current. I am using these values to calculate power (Watts) and Power Factor using the EPM_Power.Vi that is in the (EPM) Pallete. I also have a magtrol 6510e Power Analyzer wired in to ensure that my values match.
My problem is, that, I am obtaining the correct input voltage and current but, my power factor stays either stays 1 when I measure current in digits or is bouncing anywhere from .01 to .99 when I measure current as a waveform. Also when I measure current as a waveform the value is jumping all over the place.
Example: The magtrol power analyzer will say:
Input Current: 0.634
Input Voltage: 237.75
Power: 141.56
Power Factor: 0.943
LabVIEW will read:
Input Current: 0.634
Input Voltage: 237.75
Power: anywhere from 1.34 to 198.68 when current is measured as waveform or same as Volt*Amps when current is measured as digits
Power Factor: anywhere from 0.22 to 0.99 when current is measured as waveform or 1 when current is measured as digits
Please Help
I have attached two VIs showing both attempts. Oh the first VI works fine to measure DC Voltage and Current but AC is where is gets tricky.
Thanks
Scott
