Dear Tanooja,
I am wondering why don’t you use the Oscilloscope to measure the electrical signal in the time domain. The electrical power meter gives you total (average) electrical power. If you use the scope with the knowledge of the pin detector responsivity, then you can find the electrical power. There is a resistor setting in the pin in the Noise tab of the component properties window, which needs to be taken into account as well.
Regards,
Ahmad