Keysight Technologies N5991ST3A SATA, User Manual

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34 Keysight N5991 SATA Test Automation Software Platform User Guide
4 SATA Calibrations
Calibration Procedures
Random Jitter Calibration Test
The Random Jitter Calibration procedure is available for all data rates.
Purpose and Method
The purpose of this procedure is to calibrate the random jitter.
At first, the pattern generator sends a mid-frequency test pattern (MFTP)
to the oscilloscope and then the RJ value is added to the data signal. This
minimizes the measurement errors of RJ, compared to the case when
other signal degradations are present, and shall be done before additional
jitter components and common mode signals are added. The set RJ value
starts from 0 mUI and it is increased in linear steps using the Jitter Step
Size value until the value of “Stop Jitter” is reached. At each set value, the
corresponding actual RJ amplitude is measured using the
RJ/DJ-separation software (EZJIT Plus) on the oscilloscope and the set
and measured jitter values are stored separately before the set jitter value
is increased for the next step.