Anritsu BERTWave MP2100B, Operation Manual, Page: 243 / 382

7.11 Measuring Waveform
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To measure mask margin
1. Touch [Setup].
2. Touch the Sampling Mode button to set the display [Eye] or
[Coherent Eye].
3. Touch [Sampling] to set the display Run.
4. When the trace is displayed, touch [Auto Scale].
Check that the eye pattern is displayed in the center of the screen.
5. Touch [Measure].
6. Touch the Active Channel Selection button to set the channel.
7. Touch the Measure Item button.
8. Touch [Mask Test] or [Amplitude/Time&Mask].
9. When selecting [Amplitude/Time&Mask], touch the [Mask Test] tab.
10. Touch the [General] tab.
11. Touch the Align Method button to set to [Zero/One/ Crossing].
12. Touch the Margin Type button, and then select a mode of specifying
threshold for Mask Margin measurement, from [Hit Count] and [Hit
Ratio]*.
13. In the Hit Count or Hit Ratio box, set the threshold for Mask Margin
measurement.
14. When performing the single measurement, touch the button on the
right side of Mask Margin and set to [One Shot].
When performing the measurement continuously, touch the button
on the right side of Mask Margin and set to [Continuous].
15. Touch [Update].
16. When selecting [One Shot], touch [Test] of Mask Margin to set
Sampling to Hold and measure Mask Margin. On the other hand,
when selecting [Continuous], set Sampling to Run to measure Mask
Margin.
Whichever of [One Shot] and [Continuous] is selected, the mask
margin is measured so that the number of samples in the mask area
becomes less than the value set for Hit Count or Hit Ratio.
*: The relational expression of Hit Count and Hit Ratio is:
Screen On Bit
Samples Total × Ratio Hit
= Count Hit