Thank you so much for answering so promptly......and yes i can position the cursors to select the region.My Scope has RMS,Vavg and Vp-p.My Question again is,....how do i measure the avarage voltage in such typical waveform as seen above on the attachment?BEcause there are ON and OFF time...i just need to avarage the ONS only.DO you know how to calculate the avarage voltage in such typical waveform?anyone PLEASE reply...i am running out of time and i need a help.Thank you again@KeepItSimpleStupid