Microwave VSWR Measurement on Oscilloscope

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=https://s3.postimage.org/1bl5dl9xg/vswr.jpg]

Why is there a square wave displayed on the CRO?
I can only assume that your microwave source is amplitude modulated with a square wave.

Normally the VSWR is Vmax/Vmin, but in this case could it be that the detector has a square law amplitude response rather than a linear amplitude response. (The detector is calibrated or has a response which is linear with incident microwave power?).

Not having any knowledge of your microwave test bench, it is difficult to be more helpfull.


JimB