EXFO PSO-100 Series Optical Sampling Oscilloscopes - Manual (Page 73)

Setting up and Using the Optical Sampling Oscilloscope
Optical Sampling Oscilloscope 65
Using Masks
3. Enter values for the width, the height and the margin value of the mask.
4. Click OK to close the window.
To activate the mask testing option:
From the main window, select the Display menu, then Mask test and On.
The mask is automatically aligned and shown as grey areas that appear in
the eye diagram.
To view the margins of the mask:
When the mask mode is activated, go in the Display menu, then select
Mask test and Margins.
The margin will appear as a red outline arount the mask.