Sampling OR 9205 if rate not specified

Hi all

I have an application that requires the generation of a binary sequence (for that I use NO-9401). After each number is generated the back are connected to a demultiplexer, each output of the demux generates a voltage I need to acquire with a NEITHER-9205, i.e. after each number is generated, I have to acquire an analog voltage. This process must be very precise. To minimize errors, I take 10 readings of everyvoltage one generate an average. I did like on playback, but my question is the sampling frequency, that is - this determinant the sampling frequency, the time if takes LabVIEW to read the 1Chan analog DBL 1 Samp?

I also came for a result like on playback 1, however even if the results are correct, start and stop the task each round is not time efficient for my application.

I use a 9172 chassis.

Thank you very much for your help

Hi JosephM,

Your first photo (Reading.PNG) is using synchronization on demand for the two tasks. This means that DAQmx no entry or exit anything until you call DAQmx Read or DAQmx Write and the timing is entirely controlled by when your VI calls these subVIs. Adding a delay to the loop for will increase the time between the analog input samples, but "timing" software on Windows has a significant amount of jitter (it may delay much longer that you have requested).

Your second image (read 1.png) uses sample clock calendar instead of synchronization on demand for the analog input. This implies much more accurate analog synchronization because the analog input is synchronized to a sample clock that is generated in the material. However, the digital output is still software timed. You can reduce the time spent in the DAQmx Start on the task to HAVE by calling DAQmx task Control (Commit) out of the loop. This will cause DAQmx book and partially program AI material once instead of once per loop execution.

Should you precise timing? If so, you must be material too timed the digital output. The cDAQ-9172 supports load/s digital correlated in slots 1-4, which is hardware timed digital i/o using a clock source external sample (or a sampling of another subsystem clock, as AI/SampleClock or Ctr0InternalOutput). To use it, you will need to generate a matrix or a form containing digital models, you want to output waveform and in this table or the waveform, you will control the timing by repeating samples. A few screws example that should you started: dig write metered DAQmx/Digital/generate values/Correlated and DAQmx/Digital/generate values/write dig Chan-Ext CLK.

Note that the cDAQ-9172 has two internal counter on the chassis channels that are useful for generating clock for digital I/o correlated examples: / cDAQ1/_ctr0 and/cDAQ1/_ctr1. These appear in the channel physical control e/s if you right click and select «IO name filtering...» "and check the box"internal channels.

If you synchronize your DIO directly to your HAVE, you may need to insert additional examples of and throw the first samples of AI in order to take account of the time that it takes your demux to settle. If you continue to use avoiding the, you may need to insert a break from software to account for the waiting time.

Is the electric line (60 Hz or 50 Hz) noise a problem? The sample rate and the number of samples can affect how well your average eliminates electrical line noise. Plu signal advanced such as windowing can help.

Brad

Tags: NI Software

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