User`s guide

Threshold Voltage - When set to Auto, sets start and stop
threshold reference voltages (see Pulsefind) based on
the minimum and maximum pulse level found on each
channel.
The level of input voltage at which a binary logic
circuit changes from one logic state to the other. Jitter
is indicated by distributed transitions (crossings) of the
threshold as the data toggles between logic states.
Histograms of transition regions can be taken at the
threshold level.
Select Auto to set the threshold to the appropriate
voltage point of the pulsefind values.
For all measurements except Rise or Fall time, the 50%
point is used. Rise/Fall time measurements are made
according to the 10-90 or 20-80 setting in the GigiView
Edit/Configuration menu (See figure).
The voltages are shown in the voltage display boxes
after a pulsefind is completed.
Select "User" to manually enter threshold voltages in the voltage display boxes. A pulsefind cannot be performed
with this setting.
Tile command (View menu) - Arranges tool views side by side so each is visible and that no windows overlap.
Time Per Division - Sets the horizontal time scale, or use the "Horizontal Scale" knob on the front panel.
Timer Calibration - Calibrates the instrument to ensure the instrument meets specifications. The calibration data is
stored in the instrument and used each time a measurement is taken. The instrument should be warmed up at least
30 minutes before calibration. Internal calibration takes 5.5 minutes. Extended Internal Calibration allows the
user to possibly reduce jitter due to the noise floor of the instrument through the use of longer internal calibration
periods. A pull down menu to the right of the Extended check box selects the length of the calibration. See
Appendix C for a complete explanation of all calibration features.
Time Increment - Set the increment value between each strobe point. Resolution is 10ps.
Title Bar - The title bar is located along the top of a window. It contains the name of the application and tool. To
move the window, drag the title bar. Note: You can also move dialog boxes by dragging their title bars.
Toggle Marker Next Button - Clicking on the Toggle Marker Next Button scrolls through Marker selections by
displaying current selection on window.
Toolbar command (Display menu) - Use this command to display and hide the Toolbar, which includes buttons for
some of the most common commands in GigiView, such as Tool Open. A check mark appears next to the menu
item when the Toolbar is displayed.
Top Width - See figure to the right. In UI or nanoseconds.
© WAVECREST Corporation 2005
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Total Delay - Displays total delay in nanoseconds.
Total Jitter - Total jitter is the convolution of Deterministic
Jitter (DJ) and Random Jitter (RJ). (See Fibre Channel
Methodologies for Jitter Specification REV 10 page 30
at ftp://ftp.t11.org)
Glossary