DAQmx change amplitude of wave on-the-fly

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• PXI-5421 generating an arbitrary signals on the fly

  I have a card PXI-5421. I need to generate an arbitrary waveform with different frequencies. I need to have a trigger to switch between Forms of waves of different frequencies. I use the script to do this. I'm not able to update the frequency of the next wave on the fly without stopping the program. In other words, can I download signals in real time? The code is attached.

  Hey Kakrott,

  You should be able to achieve this with your PXI-5421. The example of 'switch between the waveforms FGEN"in the examples of LabVIEW makes something similar to what you're trying to do. As explained in the documentation: "this example shows how to switch between two different wave forms while generating, using updated data every time." This example uses a trigger to change what waveform is generated.

• In the latest versions of FireFox, there's a display option which allowed a change in the size of the fonts and objects on the screen temporarily on the fly. This seems to be missing from version 6.

  In the latest versions of FireFox, there's a display option which allowed a change in the size of the fonts and objects on the screen temporarily on the fly. This seems to be missing from version 6. It was very useful and should be added to version 6.

  https://support.Mozilla.com/en-us/KB/how-do-i-customize-toolbars

  If you mean the - and + Zoom control so it is always there in Firefox 6.0

  or
  View-> Zoom

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• Header does not get changed when on the fly optione activated.

  I tired to change the header of the report using a reminder & it was working fine when I generate the report by keeping the option "on the fly report' disabled. When I try to execute the same sequence with "on the fly report option" on I do not see header information that I could see when "on the fly" option is disabled. I did find the cause and found the following link http://digital.ni.com/public.nsf/allkb/05F43468942BE32E86256D980074E200 but it did not work very well. I was not able to understand the reason of not revealing the header information when "on the fly" option is enabled.

  kpraveen,

  I looked at the files attached to this knowledge base and saw that they were modified versions of files delivered with TestStand 3.0.  Because we have made some changes to these files from this version, there is no guarantee that they will work with the latest version of TestStand.

  If you need this behavior in a newer version, you can change yourself the sequence reportgen_ files.  You will need create sequences modifyheader and modifyfooter in the sequence thost files, then call these the result of OTF process sequence sequences.  We are currently working on a set of more detailed guidelines, and I'll post here when they are available.

• Change IP iSCSI on the fly?

  
  Hello

  Just, I came across an interesting, whatever it frustrating problem.  Among the two survey periods that I use for my iSCSI configuration was 'borrowed '.

  I am running ESXi 4.1 Update 2 +.  The iSCSI configuration is a typical separate vSwitch containing two vmnic, each attached to their own port vmkernel for failover purposes.

  I am running with a single path, so he has not failed yet.  Can I change the IP address on the port of vmkernel iSCSI in question on the fly?  I guess the real question is, I have to reboot the host after changing the IP address?

  Thanks in advance!

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  No you will not have to restart the ESXi host after changing the IP address of the iSCSI vmkernel

• 4462 PCI gain is editable on the fly in VB 2005 express?

  Hello

  My current setup of chanil comes from shape:
  myTask.AIChannels.CreateVoltageChannel (physicalChannelComboBox.Text, "", _)
  AITerminalConfiguration.Differential, Convert.ToDouble (minimumValueNumeric.Value) _
  Convert.ToDouble (maximumValueNumeric.Value), AIVoltageUnits.Volts)

  Where 'physicalChannelComboBox.Text' = ' Dev1 / AI0:3.

  This creats all channels at the same time, but I need to have different voltages, Min and Max.

  This is a MAX 4462 configuration.

  I'm doing this configuration in VB

  MajorVersion, MinorVersion DAQmx]

          8       6       [DAQmxChannel]          AI.Coupling     AI.Max  AI.MeasType     AI.Min  AI.TermCfg      I.Voltage.Units ChanType        PhysicalChanName        PPI2/PrimaryVolts       DC              42      Voltage -42             Differential    Volts            Analog         Input   Dev1/ai0        PPI2/PrimaryCurrent     DC              0.316   Voltage -0.316          Differential    Volts            Analog         Input   Dev1/ai1        PPI2/SecondaryVolts     DC              31.6    Voltage -31.6           Differential    Volts            Analog         Input   Dev1/ai2        PPI2/SecondaryCurrent   DC              0.316   Voltage -0.316          Differential    Volts            Analog         Input   Dev1/ai3        [DAQmxTask]     Channels        SampClk.ActiveEdge      SampClk.Rate    SampClk.Src                     SampQuant.SampMode      SampQuant.SampPerChan   SampTimingType                                  Rising                  195000          Continuous Samples      2000                            ""                              Sample Clock    PPI2    PPI2/PrimaryVolts, PPI2/PrimaryCurrent, PPI2/SecondaryVolts, PPI2/SecondaryCurrent[DAQmxDevice]   BusType DevSerialNum    PCI.BusNum      PCI.DevNum      ProductNum      ProductType     Dev1                    PCI             0x127B518               0x5             0x6             0x7170  PCI-4462
  

  I wish I could watch the values of data in time and change the gain/rainge of each channel while he was still recording data. How can I change the gain on the fly.

  Thank you.
  John

  Yes, it will work.
  Remember that you cannot change AI Min and Max during execution of the task.
  Well well... unless you will not see a difference when running

  Gavin Goodrich
  Software engineer
  National Instruments

• change of KING imaq1394 during the capture

  Hello

  I use c ++ to implement an application that performs a continuous drain on my firewire camera. According to the manual, there are two ways to do so after an imaq1394CameraOpen2:

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  Definition of attributes such as shutter time or acquire works very well on the acquisition.

  I use a Redlake Megaplus II ES11000 with NOR-DAQ IEEE 1394 version 2.0.1 of pilots.

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  Tom

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  In fact, it must cancel the acquisition to change the return on investment. If you want only to move the KING but it has the same size, you may be able to use raw register written in the right registers on your camera to change the position on the fly.

  -Eric

• Why do I only a part of the graph of the wave even if I added the whole wave using the shift register?

  It seems only to read 200 samples and then stop. Shouldn't get a chart to continuous wave after using the shift over a time register loop?

  You must remove VI begin to break out of the loop...
  You can not 'start' a task that is already running...

  You also remove the VI start completely from your code... If you do not use start VI, a measurement task starts automatically when executing the DAQmx reading VI.

  

  Find the attached VI.

• RMS / amplitude and phase to the fundamental frequency

  Hi, does anyone know how to find the RMS or amplitude and phase to the fundamental frequency of a signal measured in Labview?

  I tried with the Analyzer for harmonics of buit - in, but he can't give the values of the phase angle. I also tried the FFT VI spectrum, but I don't think the results are good.

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  Harmonic distortion Analyzer is a polymorphic VI, this means that if you connect a single signal in and then you get a unique signal, and if you connect a table of signals in out you a table.

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