Following procedures should be done just prior to adjusting the diopter when using the compound microscope?

Before adjusting the diopter on a compound microscope, ensure that the microscope is properly set up with the correct objective lens in place for your specimen. Focus on the left eye with the eyepiece, then close the right eye and use the diopter adjustment on the right eyepiece to achieve a clear view. Finally, open both eyes and make any necessary fine adjustments to ensure a well-focused image through both eyepieces.