I am using the microwave testbench shown in figure for Standing Wave Ratio measurement.
I have two choices:
one using VSWR Meter,other using CRO.
Can I apply the direct formula (SWR=maximum voltage/minimum voltage) to the square wave
displayed on CRO ?

But according to lab manual (SWR=Square root of maximum voltage/Square root of minimum

voltage). Why we are taking the square root ?


[img=http://s3.postimage.org/1bl5dl9xg/vswr.jpg]

 

Better to use the VSWR meter; you minimize your chances of errors.
Have a look at this site: http://www.microwaves101.com/encyclopedia/vswr.cfm