Anritsu BERTWave Series, Operation Manual, Page: 292 / 466

Chapter 6 How to Operate Sampling Scope
6-98
To measure mask margin
1. Click Setup.
2. Click the Sampling Mode button to set the display Eye or Coherent
Eye.
3. Click Sampling to set the display Run.
4. When the trace is displayed, click Auto Scale.
Check that the eye pattern is displayed in the center of the screen.
5. Click Measure.
6. Click Mask Test tab.
7. Click the Channel button to set the channel.
8. Click the Eye Mask Select button.
9. The file selection screen is displayed. Click a mask file and OK.
10. Click the Align Method button to set to Zero/One/Crossing.
11. Click the Margin Type button, and then select a mode of specifying
threshold for Mask Margin measurement, from Hit Count and Hit
Ratio*.
12. In the Hit Count or Hit Ratio box, set the threshold for Mask Margin
measurement.
13. Click the Mask Test button and set the display to On.
14. When performing the single measurement, click the Test Method
button and set to One Shot.
When performing the measurement continuously, click the Test
Method button and set to Continuous.
15. Click Update.
16. When selecting One Shot, click Run of Mask Margin Test 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 