Tracing a position using two voltage on a graph signals in LabVIEW

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• Subtracting the two waveforms, an acquired using DAQ voltage analog input and the other being generated internally

  Hello NOR community,

  I'm new to LabView and was hoping someone might be able to help with a question I have. Currently, I use a data acquisition unit to sample external sine and I would like to change this signal by adding another signal that I could control using the front panel. Whenever I try just connect entry with something like the waveform sinusoidal vi and put a subtraction sign between them it doesn't work (I get an empty waveform graph). To work around this problem, I've resorted to a signal (via an analog output) and followed by reading the signal to data acquisition, and then finally I add the two together. It works this way, but he wastes two channels and I imagine that there is a better way. I enclose my VI, and I have marked the location of interest "where signals get subtracted ', which is currently displayed using two entries.

  Thank you

  Leo

  You must ensure that your sampling frequency and number of samples is the same.  It seems that your sample (with default values) rate is the same (1 kHz), but your number of samples is different (100 to 1000 the acquisition wave vs simulation).

• multi channels data acquisition, a single frequency, counter a pulse, two voltage inputs, a power meter (by USB) and an analog output spontaneous and recording

  Hello

  I have a power meter which provide the USB driver and a Labview program to get the data and NI USB-6221. The project I am currently working on the needs of:

  1 acquire two signals (inputs of simple tension), pressure frequency KHz

  2. acquire a flow signal, the output signal is 0 to 5V pulse, each pulse means 0.4 ml volume. So I use a voltage inflows to count impulses in certain period of time (in this case, 1 S) for water flow. ; KHz sampling frequency and the 1 Hz update rate

  3. acquire a signal of engine speed. The output signal is pulse square wave whose frequency is related to the speed. I use a REIT port to measure the frequency. Sampling rate: Auto

  4 give output voltage sine or square wave, I use AO do that.output rate: Auto

  5 acquiring by VISA electricity meter data.  Data update rate: every 50ms

  Currently, all the 5 tasks work well separately. But when I put them together, some signals are beginning to hang, for example, pressure signals sometimes give nothing.

  Another problem is the data record. I programmed the VI in such a way that whenever I press the button 'save start', he begins to record data and save them in a .cvs file. For some reason, I always get only the data in the first table. Coult someone help me? I download my code as follows

  Hello

  What I meant by open, write, close.  For any type of file you are using.

  Open the file, which produces a reference, then put the mention in a registry to offset.

  Write data, using the function write (for this type of file) and the reference.

  When you are finished, close the file reference.

  Writing in the spreadsheet opens, written, close all at once.  It is very good for this type of application.

  ***

  The issue of the loop is more general.  I would like to say first of all, I want to say that since each loop works on its own, it is own VI, and that this program has put all this into a single VI, which has a method to solve the problem is to disable all the loops and allow them one at a time to see if there is a culprit responsible for.

  Using multiple loops executes the code at the same time, and some loops would be cycle faster than others, especially if some of them are loops just as they are.

  Communication between the loops is a test to the address if necessary.

  Running all these signals through different loops DAQ must also be examined.  Don't know what questions are for read and write somewhat randomly in the channels.

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  Greg

  Hello @gregw54,

  I understand that you are looking to use two screens on your desktop computer, and I'd be happy to help you in this case!

  To make sure that your display environment is configured correctly, I advise you to follow the steps described in this document using twoor more monitors with a computer running Windows 7.

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  As you use two monitors, do HP27q 5 K or 5K AMD R9 295 X iMac-compatible UP2715K?

  Hi isykzh,

  Thank you for using communities Support from Apple!

  I understand from your question, that you want to use a second display with your iMac and would like another monitor. The following article, the UP2715K Dell would be sustained.

  Double-cable displays

  Some if poster with greater than 4K resolutions requires two DisplayPort cables to connect the screen at full resolution. With OS X v10.10.3 or later version Yosemite, 5K 27-inch Dell UP2715K display is supported on the following Mac computers:

  • Mac Pro (end 2013)
  • iMac (retina 5K, 27-inch, late 2014 and later versions)
  • MacBook Pro (retina, 15 inch, mid-2015) with AMD Radeon R9 M370X

  Use screens 4 K and Ultra HD TVs with your Mac - Apple Support

  Best!

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• Problems to use two scb-68 has the NI PXI-6225

  Dear nor Forum,.

  I have a chassis NI SMU-1078, with embended OR PXIe8135 controller. One of the slot is busy with a PXI-6225. I for a long time successfully using 1 connection SCB-68 block a with the PXI-6225. Now, I need another channel to analog output on top of OD uses two that I am current. I plugged another SCB-68 connector Panel at the PXI6225, but I could not see analog outputs on this second bedroom. I could not see more channels to DAQmx AO create channel VI

  The PXI-6225 has only 2 analog outputs.  The second connector only has analog inputs.

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• Vertical sync to the temporal position of two or more systems 2D axis?

  Tiara in: REVIEWS,.

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  JohnGrove salvation,

  Actually, yes we CAN do it-if you have DIAdem 2010.  There is an example called "Alignment of the functions in DIAdem VIEW" delivered for the first time with DIAdem 2010.  When you run this example, you will get a new Star ' * ' icon in the top right corner of the Panel VIEW.  Click on the new icon for a collection of functions of alignment axis which I think will make you happy.

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  Brad Turpin

  Tiara Product Support Engineer

  National Instruments