compile the waveforms digital en port0/line1

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• Send the meter digital outputs while gaining analog data

  Hi all

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  Hi LVhelpME,

  There are a number of different ways to do it, but I created a quick method that makes a digital waveform with the number of samples and asking rate and then allows you to specify at what time you want to insert a "trigger" (which basically means that he will place a high in at this point in the waveform). I did this using only 3 functions and a loop that traverses according to triggers and how you want to insert. You can use a similar method or just make this code in a Subvi, which will create your digital data correlated according to the total number of samples, sampling frequency, and the specified time you want the triggers occurs to. I have attached the VI below for LabVIEW 8.0 and later versions, as well as a screenshot showing what the digital waveform will look like based on what values are entered for moments of relaxation. In the screenshot below, you'll see that there are 2000 total samples that are emitted at a frequency of 100 Hz. Thus, the total waveform will last for 20 seconds, and the trip times are listed as 5, 10 and 15 seconds.

  

  The following image shows a zoom in view of relaxation that is created during the second 5 brand, which will last for the sampling period of 0.01 seconds (100 Hz sample clock period).

  

  Hope this helps,

• Waveforms digital output duty cycle glitches

  I try to use a square wave converted to digital output to operate some solenoids but seeing some problems with the cycle on the digital waveforms. The output frequency will always be of the order of 1 Hz and duty cycle must be adjustable to integer values. I have attached a simplified below, demonstration that shows the digital/analogue output VI I used initially. the problem with this VI, is that if I choose a cycle that is not a multiple integer of my samples for waveform I get seeds. If I use the Boolean digital VI table this problem disappears in my simplified code, but in my real program the problem reappears.

  

  This image shows the waveform analog generated as well as the digital output that results.

  

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  Can someone point me in the right direction here? I'm sure that there is a stupid/easy solution, but I can't seem to get.

  Thank you!

  You might try turning the inputs A and B of waveform of the VI of the digital samples append.  It seems that A should be the fate of the shift register data (the original data) and B should be added (the new waveform) data anyway, at least conceptually.

  Paul P.

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  Greetings from Barcelona!

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• Why my sample rate does not match the output of timestamps in the waveform?

  Hello

  I run a simple application to read the data of two pressure sensors output signals 0 - 5V to a NI9215 module, and one connected to the 9237 module load cell. They are housed in the 9172 chassis.

  I am new to DAQ and labview, and I find it difficult to reconcile the sampling frequency that I put in the sample clock and the apparent rate data (according to the timestamps in the waveform that I output to a text file). For example, if I ask 100 Hz rate (and 10 samples to read), the data appear to sample at 1612,9 Hz. If I ask the sampling frequency of 1000 Hz, outgoing data is 1612,9 Hz to 20 kHz, the data came out to 25 kHz.

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  My VI is attached.

  Thank you

  Claire.

  Hi Marc, thanks for the quick response and the right explanation. It's all much more clear now.

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• How to extract the signal from the waveform of my power level designated?

  Hi all

  How can I extract the signal of the waveform accroding to the power level? I read the Trigger & Gate .vi, but this vi retrieves the signal duration. I want to extract the signal depending on the power level.

  As shown in the following figures, the signal I want to deal with is between 130000 to 140000, if I Zoom, I can see the useful signal is between 135400 to 138200. The question is how to extract the signal in the area?

  I tried the sub_NoiseEst_And_Chop_Shell.vi in the example of Packet_based_link also, but this Subvi seems to be a bit slow. Can someone give me the best advice? Thanks in advance!

  

  

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  Hello Alex Harley,

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• How display the waveform acquired DAQ card separately in wavefrom graphic

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• DAQmx Read simultaneous calls on the same digital line

  Hi all

  I use v10.0 LV 32-bit on Windows 7.

  I use DAQmx Read (in a task) to check the value of a digital line. Is it OK to do this in two different locations in a program at the same time for the same digital line? Or I have to put a wrapper around reading to force operations to be sequential?

  Thank you
  Zola

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• missing samples in the waveform graph

  Hello world

  When processing a file .wav into pieces, I noticed that there are missing samples on the waveform graph where two pieces must be met for the display. What could be the cause of this? Any help appreciated. Thank you!

  Milan

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• Convert the waveform (DBL) to a cluster of 2 elements

  Hello

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  1Thanks

  The is easy since it is part of the waveform data type.  The X, you will need to calculate based on the dt by using a loop FOR.