ilam wrote:
Dear all,

I am new to RF world, would like to know how to use VNA to measure
absolute power?

Please share your knowledge

Thanks
Ilam

Go to the S21 function. Your S21 power is read in dB... remember to
always use the appropriate attenuators as those VNAs are very expensive
and usually have a lower input power maximum of a watt or two.

The statements above are generalities... you should refer to the
operation manual for the exact VNA you will be using.

www.telstar-electronics.com