Dynamic Acq Harware Start Trigger

[JesC]

Hi Everyone,

I'm using a PXIe-6556 to capture digital signal. I'd  like to start capturing signal upon receiving a hardware start trigger in PFI0.

The PXIe-6556 works fine with this method when using the onboard clock but won't start capturing when I'm using an external clock via ClkIn as a source clock.

Is this a hardware limitation for PXIe-6556?

Regards,

jeep

[Jesse_O]

Hello jeep,

That should work fine.  You can use an external clock and a PFI trigger.  Do you need to have your sample clock running and the session started before your external trigger event?  The PXIe-6556 does require a free running sample clock, and it needs to be operational to correctly sample triggers.

I hope that helps,

[JesC]

Hi Jesse,

Before the start trigger, there is already a free running clock in ClkIn and the session has not yet started.

Regards,

Jeep