How to read multiple channels based on the external clock

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  County Board is time since you don't have a sample clock.  You can provide one from many sources, but in your case I suggest sticking to a task of frequency measurement I won't go into it now.

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  3 tasks of frequency are sampled off the input signal - so if the input signal does not switch when you start the program or if there is a long break (longer), you will receive the time-out error when the reading function blocks for more than your specified time-out.  You should be able to just 'manage' the time-out error so that if it happens you can report a frequency of 0, ignore the error and try to read it again.  There are also other approaches such as using events DAQmx or samples available to read to vote, but none of them are available through the DAQ Assistant (the idea is that you avoid making DAQmx Read blocking call until you know there are samples to read).

  Configure a task of frequency is a better option for you, because it will give more precise (although you can set a task of County of edge to behave similarly to a frequency measurement task, this is trickier and you can also use the DAQ assistant).  You can start out by setting 1 sample (on request) for the synchronization mode - this will return a single sample as soon as it is available.  If you put the DAQ Assistant, in a loop, you will get a new sample at each iteration (or if your input signal goes, the samples will stop coming in and you'll get time-out errors instead).  The downside is that you will not receive a sample on each side - entry task is reset by software and during this downtime between the samples will take no new data.  This should be good for the case of the use you described (the frequency of a continuous square wave periodically monitoring).

  So, make sure that the external signal conforms to the specifications of the 9422, and it is connected to the correct terminal (the PFI line which is equivalent to the DOOR of your meter by default).  If your external signal is less than 0.2 Hz (1 sample every 5 seconds) you will need to move away from the DAQ assistant, as it seems that it is not possible to set the timeout of read using the DAQ Assistant (surprisingly).  You might want to look in the API of DAQmx lower level anyway - here is a simple example to help you get started in the affirmative.  It's really not too complicated and once you get used to it will be less heavy than using the DAQ Assistant.

  Best regards

• HSDIO 6556 loses the lock on the external clock

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  I hope this helps.

  Thank you

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