Best way to generate signals of activation (square wave) with my 9401 on my 9022?

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• Best way to generate a PWM for a stint with LabView2010 and a laptop

  Hello

  as mentioned in the title, I'm looking for the best way to generate a PWM signal to a relay. I want to use a laptop computer and the LabView2010 for she. I have read through several topics, but after a time that he just got more confused. For example the NI USB-6008 OEM case seems to be a solutiion at low prices, but I don't know if I can use for the generation of PWM signals like this thread says is not possible:

  http://forums.NI.com/T5/Multifunction-DAQ/using-PWM-on-NI-6008/m-p/231860/highlight/true#M13339

  But then again this thread right here makes it seem as if it was doable:

  http://forums.NI.com/T5/Digital-I-O/generating-a-PWM-using-USB-6008/m-p/421654/highlight/true#M5527

  Once again in abbreviated form.

  What I need:

  -the best way to generate a PWM signal to control a relay

  What I have so far:

  -LabView2010

  -Laptop

  If possible, it would be good to have two channels for two separate signals, but it is more low importance right now.

  Hey Kambra,.

  The first thread you mention is correct, you can't make output PWM in any deterministic mode with a 6008. The 6008 is strictly software timed, which means that each digital writing that is done in the unit must go through the operating system and down to the device. And there is a lot of jitter of the involved BONE. The second article you mention says the same thing. They emphasized that they could reduce the jitter of some, but still can not remove it entirely. In the second thread, they mention using a M-series USB device do output PWM deterministic (timed material).

  The compromise really down to your application and its requirements. If your application to control the relay requires no determinism, then you can use the 6008. If you need precise control over the relay, try the USB M series.

• With the help of modulated signal pulse width (square wave) to control when a signal is enabled or disable

  With the help of modulated signal pulse width (square wave) to control when a signal is enabled or disable

  Hello all

  I am using a modulated signal to labview created pulse width (square wave) to control when a signal is activated or not.

  Here is my logic and a concrete example:
  (1) the wave source signal is continuous
  (2) use a PWM (square wave) created in labview to control when the signal is enabled or disabled
  (3) if the PWM (amplitude) signal is superior to 0 play signal PWM is not greater than 0 do not play signal.

  I use actually this to the sequence step / pulse several distinct magnetic coils using my audio card (which has several channels of audio output), I have a signal in labview played constantly.  As to compare it to the PWM (square wave) which controls whether or not the signal is played on each separate channel.  That way I can control which coil is on and offshore and in what order they are activated.

  I couldn't find an edge detection for a square wave created in labview, so I tried the limits, but it doesn't seem to work unless I change the phase manually and it only goes 1-1.  I'm just trying to compare the PWM (edges of the square wave) already created by labview / play a signal if the pulse is greater than 0 and it shuts off the signal, if she is less than 0.

  Should I do this another way

  TIA

  A waveform contains an array of values. You must check every value and respond accordingly:

  

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  Hi all

  I wonder if there is a better way to generate a clock software for USB-6501 of Measurement Studio for VS2008 in C Sharp?

  I have developed a clock using C Sharp "Thread.Sleep (msecPauseTime)"; and statements to switch digital output high and low. There are a few things I noticed in creating a software clock in this way:

  1. The smallest delay by the Thread.Sleep command time is 1 millisecond (which means higher clock period is 2 msec-500 Hz, not holding not ball account no. 2 below).
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  In my application, I create signals (a clock, a latch enable and data series) to control what an attenuator step through the USB-6501 RF connected to a USB 2.0 on my computer. This particular step RF attenuator can accept clocks with frequencies up to 10 MHz, so I would like to generate a software clock (without having to connect to an external clock to a line of input on the USB-6501) which is closest to this maximum frequency, and I think that the USB2.0 line could handle clock speeds over 500 Hz. Also, I would like to know why the delays that I see on the scope are sometimes longer than the time specified by the Thread.Sleep command. Is it caused by the suspension of the execution of my program processor for something else, as I suspect? Of course, this isn't a big deal, because it does not affect the time as my serial data and pieces change compared to my clock. However, I would like to know why it does this.

  I appreciate your help.

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  Jonathan Becker

  Doctoral research engineer

  Carnegie Mellon Silicon Valley

  Jonathan,

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  You can try to set the priority of your thread 'generation of clock' to improve performance, however, because Windows is not a deterministic operating system, there are still no guarantees.  Operating systems are not required to honor the priority of threads.  You can find examples and information on the definition of the priorities of the threads in c# here:

  http://msdn.Microsoft.com/en-us/library/system.Threading.thread.priority.aspx

  Kind regards

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