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 the
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 value for each parameter.

[russellb]

Hello,
1. In order to trigger each board independently set the trigger source for each board to an independent trigger source. For example if you want to send a trigger to each board on the PFI 1 pin of each board respectively, then you could set the trigger source on the niScope_ConfigureTriggerDigital function to PFI1. For more information on triggering parameters please refer to the NI-SCOPE Function Reference Help.
2. There is a synchronization example for the PXI 5112 included with the NI-SCOPE instrument driver. If you installed the NI-Scope in the typical location and you have Windows NT based OS the examples will be located in
C:\VXIpnp\WinNT\NISCOPE\Examples
Set the input clock source parameter to PXI clock for the niScope_ConfigureC
lock() function.

Regards

Russell Blake
Applications Engineering
National Instruments

[diaoxiumin]

Hi,thank you for your response!
I have tried the synchronization example for the PXI 5112 included with the NI-SCOPE instrument driver. I find that the master device routes a digital trigger to the slave device when it receives its trigger.In other words,both PXI 5112s are triggered almost at the same time.However, I just want to share the same reference clock for all the PXI 5112s and trigger them independently with the external signals.How can I do this?
Thank you in advance.