NI-TClk Manual Calibration Using NI-RFSA

Complete the following steps to improve the synchronization accuracy by lowering skew and minimizing jitter of NI-TClk synchronized devices using manual calibration.

  1. Connect the external signal to the VSTs. For best performance, minimize unnecessary skew by using matched length cables.
  2. Configure the VST for acquisition using NI-TClk. If using LabVIEW, use the RFSA Synchronization (TClk, Shared LO and Reference Clock) (5840).vi example.
  3. Start the acquisition and measure the skew between devices, noting the amount of jitter.
  4. Read the value from the Absolute Delay property. Stop the acquisition, modify the value, and write it back to apply skew correction.
  5. Repeat steps 3 and 4 until you achieve the appropriate synchronization results.
  6. Read the value from the Absolute Delay property and store the value for future synchronization sessions.
To apply the manual calibration synchronization results, write the stored value to the Absolute Delay property before calling the NI-TClkSynchronize.