Phase Delay Between Multiple NI-TClk Synchronized Digitizers When Using a Trigger Delay
Hardware: Modular Instruments>>High-Speed Digitizers (Scopes)
I am trying to synchronize two NI Digitizers using one of the NI-SCOPE Synchronization Examples from the NI Example Finder. If I add a Trigger Delay I notice that I have a phase offset between devices. Why does this happen?
The NI-SCOPE NI-TClk based synchronization examples only configure a trigger for the master device. This is typically acceptable, since NI-TClk is used to synchronize the slave devices to the master. However, when using a large trigger delay, like a 1 second delay, it becomes difficult for NI-TClk to synchronize the two devices correctly. To fix this issue please follow the steps below:
Note: The above changes should be implemented only if using the following examples:
After making this change you should no longer see a phase delay between the devices when using a trigger delay.
NI High-Speed Digitizers Help: Trigger Delay
NI High-Speed Digitizers Help: niScope Configure Trigger (poly)
Example Program: niScope EX Multi-Device Multi-Chassis TClk Example in LabVIEW
Specifications Explained: NI Oscilloscopes and Digitizers
Report Date: 01/28/2014
Last Updated: 10/04/2017
Document ID: 6HRHK8AO