the user to see an oscilloscope trace in persistent mode, allowing direct inspection of the eye. Color represents the frequency with which the measured trace passes through each point, with red representing the most frequent, and black representing the least. Note that frequency is normalized to a maximum value of 1. Voltage Histogram - This measurement is similar to the jitter histogram except that it is done in the vertical domain. It shows the amount of voltage noise that exists on the high-speed serial signal and is similar in principle to the vertical eye height. Jitter generation Data pattern LIVE traffic Preprogrammed Compliance patterns Jitter profile Frequency range 19.07 kHz - 19.99 MHz Amplitude range 40ps - 1200ps Differential swing 400-1600mv External links Jitter analysis tool from FuturePlus Systems. References Digital electronics Electronic test equipment