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Manual Adjustment of NI-TClk Synchronization

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    Last Modified: June 5, 2020

    Manual adjustment is the process of minimizing synchronization skew and jitter by adjusting Trigger Clock (TClk) signals using an instrument driver.

    You can use the NI-TClk API to synchronize the action of multiple instruments. Manual adjustment tunes the sample clocks and triggers of instruments that have been synchronized using NI-TClk, which enables better alignment than you can achieve using NI-TClk synchronization alone.

    The following terms apply to manual adjustment and NI-TClk synchronization:

    • Skew—Misalignment between instrument timing across slots of a chassis and across chassis that is caused by clock and analog path delay differences
    • Jitter—Variation in instrument alignment that can be expected with each call to the NI-TClk Synchronize function
    • Repeatability—Consistency in the effect of the NI-TClk Synchronize function across instruments; reduction in jitter

    Perform manual adjustment to obtain the best possible NI-TClk synchronization between supported instruments.

    Refer to the specifications for your instrument for the synchronization specifications you can expect using NI-TClk with or without manual adjustment.

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    Note

    Manual adjustment can minimize skew only between multiple instruments, not between multiple channels of the same physical instrument. Mulitple channels of the same physical instrument are always synchronized.


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