PCI-6071E scan several clocks

Hi, we intend to use the PCI-6071E to measure signals of tension of two photodiode arrays (PDAS). Detailed implementation is the following:

Mode of operation: input analog, acquisition continues, external clock of sampling/analysis (rate ~ 100KS/s), external start trigger

Software: C++ based on NI-DAQmx

Start by the example code "ContAcq-ExtClk - DigStart.c.

We intend to use a single analog channel for PDA. Each PDA sends a series of singals trigger (which will serve to 6071E as sample clock), an edge from low to high for each pixel. The experience is configed such that most likely, we can use the same start for the two entries of PDA, but their clocks in the sample may have a relative delay (typically a few microseconds). We certainly prefer to acquire the data of each input channel with respect to his own sample clock.

Is it possible to do? How?

Our initial estimate is to schedule two TaskHandlers, each with its own sample clock configed (maybe start trigger as well) and start/play/stop almost at the same time. This seems reasonable? If so, our ultimate goal is to work with two more PDA (a total of 4). What is the limit of the number of sample clock so all acquisitions are made sinmutaneously?

Thank you for your comments in advance and your solutions.

Kunyan

Hello Kunyan,

Unfortunately, with the 6071E you only PFI monotube (PFI 7) for the sample external clock use, as a single line PFI to HAVE start the use of the trigger.  You can see 6071E specifications to see these lines.  You will most likely run all your PDA out of the same sample clock and starting to trigger, unless you do not want to use several DAQ cards.  I hope this helps.

Kind regards

Tags: NI Products

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