SOP's..... amazing! They are written in blood.
Stick to them lest your blood writes the next one.
Functional test of wx radar at altitude is easy. Point down full, paint the surface, adjust the brightness and range scale, and return the the scan angle to -5 degrees. At 200 mile range, will get anything popping over the horizon.
Takes as long as it took you to read this. Not doing it is.... lets see... LAZY!