synchronize clock for PXI NI5112s

[diaoxiumin]

"Now in my system there are 4 PXI NI5112s. I just want to synchronize the clocks for my 4 NI5112s in order to let all the signals sampled by them have a common timebase.However,for some reasons of my signals,I cannot sample all of them when one triger comes.That is to say,although I want to share the same reference clock for all the NI5112s,I still want them to be triggered independently.
1、How to do this with PXI NI5112:synchronize the clock for multi NI5112s while triggering each board individually?"
2、I want to synchronize the clock by using the 10 MHz backplane clock for all devices. Can you give me an example developed in the environment of LabWindows/CVI or Measurement studio for Visual C++ to show me how to set th
e reference clock to be the same,if it is feasible?Now I use the function niScope_ConfigureClock() to configure the clock.However,I don’t know how to choose the values for each parameter."

[bman]

There are several examples located in the VXIPNP folder after you have installed NI-Scope for CVI and C++.

I've attached one of them that synchronizes two NI 5112 devices together. It does this by both sharing the 10 MHz clock and with a trigger. You will want to change the triggering parameters since you are going to be triggering off different signals. This example should show you though how to share the 10 MHz clock.

Brian

[diaoxiumin]

In this example,both NI5112 share the 10MHx clock and are trigered almost at the same time.I route the same pulse signal(10Hz) to all four channals.Both NI5112 use analog edge triggering and the trigering source is the channel 0.So all the NI5112s should be trigered almost at the same time.However,when I fetch the waveform with the function niScope_Fetch in sequence,I find that the values of wfmInfo.absoluteInitialX of the master and slave vary a lot(10-70ms).why?"