NI-TClk Manual Calibration Using NI-RFSG

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 RF output connector on the vector signal transceivers (VSTs) to a multi-channel signal analyzer. For best performance, minimize unnecessary skew by using matched length cables.
  2. Configure the VST for generation using NI-TClk. If using LabVIEW, use the example.
  3. Start the generation and measure the skew between devices, noting the amount of jitter.
  4. Read the value from the Absolute Delay property or NIRFSG_ATTR_ABSOLUTE_DELAY attribute. Stop the generation, 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 or NIRFSG_ATTR_ABSOLUTE_DELAY attribute, and store the value for future synchronization sessions.
To apply the manual calibration synchronization results, write the stored value to the Absolute Delay property or NIRFSG_ATTR_ABSOLUTE_DELAY attribute before calling the niTClk Synchronize VI or niTClk_Synchronize function.