User`s guide

Pulsefind Button/selection (Action menu) - Performs a peak-to-peak voltage measurement and sets
the voltage threshold to be used for timing measurements. This is normally the 50% point unless
rise or fall time is being measured where 20%-80% or 10%-90% is used. These rise or fall thresholds
are set in the Edit|Configuration dialog box.
Pulsefind Mode - Selects the mode used when determining voltages for calculating voltage thresholds. The default is Peak.
Quick Mode - This option enables a sparse sampling protocol for RJ+PJ data acquisition that reduces the time required
to obtain data. This method is appropriate for use only when there is insignificant higher-frequency jitter present. In
the presence of high frequency jitter, the standard sampling protocol will reduce the amount of harmonic distortion
that can occur.
Random Jitter (RJ) - Random Jitter (RJ) is probabilistic in nature and is best modeled by a Gaussian function. Random
Jitter is unbounded and therefore directly affects long-term reliability.
Range (ns) - Sets the length of the x-axis in the Time View. Changing this value affects the resolution of the FFT.
Range (Periods) - Number of periods over which measurements are plotted. Edges to Measure determines number of
periods within this range to be measured.
Record Len (µs) - Options depend on the selection of Record Length Units.
• Rec Len (µs) for Time Interval. Number of cycles to measure determined by the time entered.
• Rec Len (Periods) for Periods. Number of cycles to measure determined by the number of periods.
• HPF –3dB Freq (kHz) for Bandwidth. Number of cycles to measure determined by the half power point of the
20dB/decade low frequency roll off.
Record Length Units - Sets the unit of measurement for the data record length. Options are: Time Interval, Periods,
Bandwidth and Unit Interval.
Reference Channel - Select channel for clock input.
Multi-Channel Strip Chart Tool:
Select the Channel to be used as the reference channel. All measurements
displayed on this tool show a "skew" or propagation delay. The displayed
measurements will be relative to this Reference channel. Use the keypad to
select one channel.
Reference Edge - Select the rising or falling Bit Clock edge that will be used to trigger the readings. Arms the
measurement based on the Reference edge type chosen and the Measurement edge type chosen. This is available in
the Channel-to-Channel Strip Chart tool.
Reference Edge Count - Enter a number of edges to skip on the reference edge relative to the arm time. This control is
typically only used with Arming Mode set to "External Arm".
Remove Device - Select the "Remove Device" button to remove an optical device from the remote device list and
disable the
OE-2 address for the device.
Remote Device List (OE2) - The
OE-2 address will appear in the Remote Device List.
Reset All - Resets all user selections to default.
Reset Counter - Deletes the buffer containing the bit errors.
Reset Hardware - Clicking on this button will restart the
SIA-3000. All settings will be lost unless previously saved.
Resolution (ns) - Sets the time increment value between each point in the Time View. The smallest value is 10ps
between strobe points. Changing this affects the high frequency end of the FFT by the relationship: FFTmaxfreq =
1/z(resolution).
Resolution (ps) - Sets the time increment value between each measurement point. A smaller value will result in more
closely spaced samples.
Rise/Fall Time button - Toggles on or off Rise and Fall time Measurements. Set 10%-90% or 20%-80% in the on the
top menu. The default is 20%-80%.
Rise Time Limit - Pass-Fail limit for rise time measurement. This is set automatically if a protocol has been chosen.
RJ + PJ Interpolation - This option selects the means of filling the gaps in the autocorrelation function that naturally occur
in a pattern. Generally, the Cubic interpolation will produce the best results in the presence of periodic jitter. Selection
of Linear interpolation may be preferred in the presence of purely random jitter. In which case, the presumption of a
smooth autocorrelation function cannot be made.
© WAVECREST Corporation 2005 Glossary
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