LM5116-12EVAL: Efficiency measurement tools used by ti.

Part Number:LM5116-12EVAL

Dear all,

I need to know what tools you used to measure efficiency of 12V, 50A buck converter module or any other module as reference.

I have used several tools, but it is always a doubt topic, whether i am measuring efficiency correctly or not?

I need to know the model no of tools used for 

1. Voltage

2. Current

3. Power

If you are using power analyser, what mode do you use? Apparent power or Real power?

Thanks