Reference
Using Line Select. When Line Select is off, the jitter measurement reflects the maximum amount of jitter in the full field. When Line Select is on and Line sweep is selected, the jitter measurement displays “line n jitter,” with n being the selected line number. The jitter measured on an individual line will always be equal to or less than the full field jitter measurement.
Bandwidth Filters. The waveform monitor provides four bandwidth filters: 10 Hz, 1 kHz, 10 kHz, and 100 kHz. These filters only show jitter terms above the selected filter frequency.
When you select a filter, depending on the active input signal, you select the jitter measurement type (Timing, Alignment, or neither, as defined by the SMPTE standard). Use the lowest settings to measure timing jitter and the higher settings to measure alignment jitter. The type of jitter measurement is displayed in the Measured Jitter box.
To measure timing jitter, select the 10 Hz filter for both SD and HD video signals. To measure alignment jitter, select the 1 kHz filter for SD video signals and the 100 kHz filter for HD video signals.
NOTE. Many jitter problems in systems have resulted from genlocking clocks to other references, such as the horizontal synchronization pulse. Reference jitter transferred by genlocks into a serial system is typically between 20 and several hundred Hertz. Also, the phase detection process used by the genlock can add noise, which results in jitter in the 10 Hz to 1 kHz range. Use the appropriate BW Limit filter selection to include or reject genlock jitter from a measurement.
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