i am currently carrying out power factor measurement system. If my load is pure resistive, i could get unity power factor.

However, when my load is pure capasitive, i cant get phase shift of 90 degrees. My phase shift will change to different

value depends on my capasitive value. For 1micro Farad, i get 80 degree,power factor =0.19. For 6 Micro FArad, i get 33 degree, power factor 0.83

Is it the capasitive value will change my power factor? But the theory stated that if pure capasitive or pure inductive load, there will be phase shift of 90 degrees.Is it practical and theory have difference?I am confused about this.

Thanks