Patent ID: 7652667

Claim:
A method of operating a digital storage oscilloscope comprising: receiving a signal at an input of the oscilloscope; providing a display screen operable to display a waveform representative of said signal; providing a mask having a first compliant region in which the waveform is desired to remain; the mask having a second non-compliant region in which the waveform is in violation of the mask rules, said violation being an intersection of a pixel of said waveform and a pixel of said second non-compliant region of said mask; displaying the waveform on the screen; displaying the mask; displaying portions of signals occupying the compliant region with a constant illumination; displaying portions of signal occupying the non-compliant region with a cyclically changing illumination; and wherein displaying portions of signals occupying the non-compliant region with a cyclically changing illumination includes limiting the changing illumination to non-compliant signal portions encompassing less than a predetermined number of pixels; and wherein said predetermined number of pixels is adjustable in response to input by a user.