Synch Tclk range F - gen

Hello

I have a PXI-5922 and a PXI-5412. I try to sync the cards using the tclk functions provided.

I put the 5412 to receive an external trigger on PFI 0. Then used Tclk in an attempt to start the scanner at the same time.

The problem I have is that the digitizer is missing from data generated by the f - gen. I know that this particular f - gen has a period of 43 samples + 110ns until it starts to generate a waveform, but this delay applies as from the PXI-5922. With the help of a scope it is an approximate time of 120us.

I also tried the opposite, where I put the scanner to receive external signal and then configured the tclk. F - gen starts instantly and the digitizer expected relaxation before starting.

If all goes well there is something simple that I'm missing. Any suggestions would be greatly appreciated.

Kind regards

Brett

I'm glad that you were able to get the example!  I'm curious to know how you make sure that the data is to be missed by the digitizer.  How many samples is missed and what is ongoing synchronization, you found?  You can try to set the scope as the master device and receive external triggering, but you may need to modify the code to take account of this (switch the two tasks in the program).  The device that receives the external trigger is considered to be the master device.

The advantage of using Tclk syncing is having machines respond to triggers at the same time (on the same sample period) and have a very close alignment of the clock of the sample.  The device that receives the trigger from an external or internal source it generates it will send the signal to all devices, including himself, on a falling edge of the TClk.  TCLK allows a precise trigger of the devices synchronized with an inclination of about 200 to 500 ps.

Tags: NI Hardware

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