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Different Signal synchronization NI Digital Pattern Editor LabView Code with two PXI 6570

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Hello Community,

 

I hope that is the right place for my question. 

I have a timing problem(delay) between two signals at different PXI6570 cards.

 

My Hardware Config:

    NI-PXIe-1082
    Slot4 - NI-PXIe 6674T
    Slot 2/3 und 5/5 NI-PXI 6570

 

My problem discription:

In case I let run the pattern "Timing_Debug.digipat" im "NI Digital Pattern
Editor", is the signal difference is lower than 1.5ns. (Timing_with_Pattern_Editor_TDR.png)


The other case is I use the same pattern in a TestStand sequence and *.vi and get a signal delay of about 10ns. (Timing_with_LabViewCode.png)

The Time-Domain Reflectometry (TDR) option and syncronisation is in both cases activated.

 

Could anyone tell my what is wrong in the *.vi?

 

I attatched the Project and Pattern.

 

Many thanks.
Regards,

Matthias


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