User`s guide

Edges to Skip - Will determine the number of edges to skip before the time measurement stops. When measuring
Period, a value of zero will create a histogram of single period measurements. A value of one will create a
histogram of double period measurements, etc. Thus, when skipping one edge, the mean measurement would
be doubled.
Edit Mask - Clicking on the Edit Mask button will provide access to fields for changing the position and size of the mask.
Edit Pattern - Directly input data patterns in either binary or hexadecimal form.
Effective Frequency (MHz/ns) - Displays the SYNC OUT frequency value based on the Sync control setting. This
value is non-editable and is for informational use only.
Effective Jitter - Several Bit Error Rate Testers (BERT) offer the ability to derive Deterministic Jitter and Random Jitter
from a Bathtub Curve. Since this method is based on a pure DCD/DDJ jitter model, it tends to generate lower DJ
and higher RJ values. This option is offered in the event values are desired that are determined on a comparable
basis to a BERT.
High Limit - Upper limit of Bit Error Range over which the Effective Jitter is derived
Low Limit - Lower limit of Bit Error Range over which the Effective Jitter is derived
The Effective Jitter algorithm uses a total jitter (TJ) value to derive both DJ and RJ. This is opposite of the Tail-Fit
algorithm which determines DJ and RJ to derive TJ.
Enable Button - Pressing on the Enable Button scrolls through Marker selections by displaying current selection on
window. When desired marker is displayed, pressing the Select button will activate marker selection.
Enable Eye Mask - Turns the Eye Mask on or off.
Enable Histogram - "Disabled" turns off any histograms
"Vertical" turns on a sample box used to create vertical, or voltage, histograms of the samples that fall inside the box.
"Horizontal” turns on a sample box used to create horizontal, or time, histograms of the samples that fall inside the box.
It is important to note that these samples are derived from the Oscilloscope or Voltage Measurement Engine. To get the
best time measurement histograms, use the HISTOGRAM Tool that allows calculation of RJ, DJ, and TJ.
© WAVECREST Corporation 2005 Glossary
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