power analyzer using usb sound card

[capricorn815]

sir,

i am making 3 phase power analyzer using usb sound cards. 

i make vi for this task. 

my vi gives some problems.

1- the wave form did not exact at 120 degree out of phase.

2- power factor meter chage the reading with the increment of 0.01 and continously deviate.

please help me for getting smooth and acurate signal and power factor.

i attach my vi in this post . modify the vi with best logic. 

thanks and regarads,

ahsan iqbal

student of electronics engineering.

[capricorn815]

i attach single phase power analyzer plz check this one.

i try my best but i did not get the right values 😞

[Yifan.Liu]

Hi,

It seems like your signal acquisition module does not sample voltage and current signals simultaneously. You can find related information from the specification of your module on www.ni.com.

Thanks,

Yifan