Increase in the number of samples taken per second
So I am a beginner in LabVIEW, and I work in a program to help me with some research. I enclose my VI below, and I take the data at a rate of almost 2000 samples per second (using the express deadline fixed VI a.001s). However, I need to be taken of data to approximately 10,000 samples per second, but if I try simply decrease the amount of delay (up to a.0001s), does not increase the sampling rate. Someone at - it thoughts/solutions to tide me over? Thank you.
Use the example Finder and search for the "Input.vi - continuous voltage. It is a good example of an acquisition of base. There is also a built-in DAQmx called Logging configuration. When activated, DAQmx will automagically be journal of task data to a TDMS file for you. Use the continuous acquisition and set the frequency of sampling to the desired frequency. You will need to read multiple samples to stand. But this example is a great place to start.
Tags: NI Software
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samples per channel and the number of samples per channel
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In your case, the VI will acquire the lesser of either:
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-OR-
The number of iterations of your for loop (N) times the 'number of samples per channel"that you have defined on the DAQmx read VI
The "samples per Channel" VI DAQmx of timing for a finite acquisition dictates how many samples the DAQ hardware should acquire in it's onboard buffer before indicating that the acquisition is complete. "The number of samples per Channel" on the read DAQmx VI dictates how many samples the DAQmx driver must return buffer on board the aircraft to your application.
Let's say the "samples per channel" on the calendar DAQmx VI is set to 50. Thus, the card will acquire 50 samples and place them in the edge of the buffer, then stops. Suppose we have the 'number of samples per Channel"on the DAQmx reading VI the value 3 and what we call the VI in a loop For which runs 10 times. Thus, every time the DAQmx lu VI is called, it will wait until there are at least 3 samples in the buffer, and then return these three. We call the VI a total of 10 times, then we will answer 30 total samples. Thus, the last 20 samples acquired the card remains in the buffer and are destroyed when the task is disabled.
Now let's say that we increase the "number of samples per Channel" on our DAQmx Read VI at 10. VI Read will wait until 10 or more samples are in the buffer, and then return these 10. Thus, we will be back all 50 samples map acquired by the 5th iteration of the loop For. The 6th time we call him VI DAQmx Read it expires, because there will never be another 10 samples in the buffer, and the VI returns a warning.
This clarifies things?
The purpose of this behavior is to allow you to both set the total number of samples that the DAQ hardware will acquire and also control how much of these samples is returned whenever you call the DAQmx Read VI.
Kind regards
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I use the DAQ assistant for analog voltage of an input OR data acquisition card. What is the difference between the rate and the number of samples in the DAQ assistant and what are the units of the two?
Thank you.
The number of samples is how many discrete to measures. Rate (per second) is how fast to acquire the specified number of samples.
If number of samples is 100 and the rate is 1000 samples per second, then the acquisition would take 0.1 second (100 / 1000).
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error: the number of sample must be >; 0 Please help.
Dear genius.
I tried the same mistake in this forum, but I do not understand how I can solve my problem.
I'm just a beginner in LV, so I need your help. I made AM modulation and demodulation vi.
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It seems that your alignment of waveform leave you with empty waveforms. You could just get rid of it. Just make sure that the number of samples generated in your carrier is identical to the one generated by your acquisition of the sound wave.
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