User`s guide

Gaussian - A statistical distribution (also termed "normal") characterized by populations that are not bounded in value
and have well defined "tails". Analog amplifiers are the most important source of Gaussian noise in serial data
transmissions. The term "random" in this document always refers to jitter that has a Gaussian distribution.
Global Tool Settings... - This popup dialog box allows access to settings that can affect all tool applications.
The rise/fall setting is global for tools such as the Oscilloscope and Clock Analysis tool.
There are two fixed settings 10%-90% and 20%-80%. Two 'user' settings also allow you to determine the levels at
which to measure rise and fall time. 'User Volts' is an absolute setting for the voltage levels. The High Level and Low
level can be independently set. 'User %' allows you to choose a 'Low Level %'. The signal is measured to determine
the peak high and low, and rise time levels are set to a percentage of the total amplitude. The High level is
automatically set.
Goodness-of-Fits - Goodness-of-fits is used as a gauge to determine how "good" the fit is. The fitting function is
Gaussian and the fitting algorithm is nonlinear so it can handle both linear and non-linear fitting functions. Low
values indicate better fits.
GPIB Address Assignments tab - This popup dialog box manages the address settings for both the GPIB host and the
remote OE-2(s). Up to five can be addressed in a single system. The GPIB Board selection controls the host GPIB
address while the GPIB Device selection sets the address of the remote OE-2(s). Set the GPIB Device setting to the DIP
switch setting on the back panel of the OE-2 and select the Add Device button. The OE-2 address will appear in the
Remote Device List. In the case of multiple OE-2 installations, each remote device will have to be added individually.
GPIB Board - Controls the host GPIB address. GPIB Board should be set to the card address for the bus connected to
the OE-2.
GPIB Configuration... - This popup dialog box gives the user easy access to GPIB addresses and target devices.
GPIB Device - The GPIB Device selection sets the address of the remote OE-2 connected to the GPIB bus. Set the
GPIB Device to the DIPswitch setting on the back panel the OE-2 and select the "Add Device" button. The OE-2
address will appear in the Remote Device List. In the case of multiple OE-2 installations, each remote device will
have to be individually added.
Header Offset - Allows user to skip a given number of edges, after the external pattern marker, before sampling. This
can be helpful in applications such as Hard Drives where a header precedes a repetitive data sequence in the data
stream. This option is only available when using external arming and applies to all dataCOM sampling, including
Learn Pattern.
Height (mV) - Scale the height of the histogram box in relative or absolute values.
Help Button - Clicking on the button activates context sensitive help. Once activated, the cursor changes to
the Help Topics icon and will remain so until another click of the pointing device occurs. Upon clicking
the second time, help text will be displayed.
Help Topics Button – Clicking on this button will start the online help system. A directory will be displayed
from which the user can access information about GigiView. From the opening screen, you can jump to
step-by-step instructions for using GigiView as well as various types of reference information. Once you
open Help, you can click the Contents button whenever you want to return to the opening screen.
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Height (mV) - Scale the height of the histogram box in
relative or absolute values.
Hide Display Channels button - Opens a selection
box to turn on or off a view of a specific channel.
High Limit - Upper limit of Bit Error Range over
which the Effective Jitter is derived.
Histogram Options Button - This button will open a
menu for configuring a histogram window. The
histogram shows statistics from the samples that
fall inside this window.
Hits Per Measure - Determines the number of time
measurements that will be made for each edge or point on the plot. See Histogram Theory.
Glossary