Using NI 9512 with Modulation of frequency step Position? (cRIO)

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• Use the same code module to multiple steps in the sequence

  Hi all

  I tried to implement a sequence that uses the same code for all steps module in the order, but I'm not returning to it when I need to send it commands.  I got regarding the appellant the VI in a new thread so that it can be executed asynchronously.  I can run the simple sequence and it will indeed open the VI and move to the next step.  When I close the VI manually from the front, the TestStand sequence is completed, as planned.  So it turns out that I have a lot more work.

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  GSinMN

  What I do is use a queue to send data to the asynchronous VI.  So he can run and whatever, but also receive orders from the queue.  I use a motor of Action that contains the reference to queue and sends the commands.  If you really just call the engine of the Action of your sequences.

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  Using Acrobat XI with IE11 and Win7; I can't the acrobat toolbar. Watch modules Manager he's here and activated, but the toolbar is not there. And when I use right click and click on convert to Adobe pdf format, nothing happens.

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• Returned by DAQmxGetDevCIMaxTimebase for a NI 9361 module incorrect frequency limit

  Hello
   
  I have a NI 9361 module in a 9178 cDAQ chassis. My workflow is as follows:
  (1) create a new task
  (2) add a the meter inlet channel to the task
  (3) the maximum basic rate of time meter using DAQmxGetDevCIMaxTimebase entry question.
  (4) set the sampling frequency clock using DAQmxSetSampClkRate at the speed required in step 3.
  (5) Perform other steps such as add a channel of analog input or external clock to the task.
   
  I get an error in step 4:
   
  Requested value is not supported for this property value. The value of the property may be invalid because it is in conflict with another property.
  Property: DAQmx_SampClk_Rate
  Required value: 100.0e6
  Maximum value: 40.0e6
  Minimum value: 22.250739e - 309
   
  Why step 3 returns 100.0e6 when I put only a maximum of 40.0e6? Must I call another method instead of DAQmxGetDevCIMaxTimebase? I have attached my code for your reference.
   
  Thank you
  Varun heraud
  The MathWorks

  There is a difference in how the counters work for the 9361 NOR in the cDAQ and counters in other devices (including the cDAQ chassis counters).  The 9361 OR use a chassis timing engine, so it does not require an external sample clock, and it transfers data to the bottom of basket on each sample clock.  Therefore, there is a limitation on how fast that can occur and the DAQmxGetSampClkMaxRate function allows users to query this value.   The counters on the USB-6211 USB 6351 require an external sample clock, and since they are one of the subsystems of the device, the maximum sampling rate is not dependent on engine, no data transfer time constraints so DAQmx does not support the property of max (for the tasks of meter) sample rate.  For these devices, you get an error if the counters have no new data between the sample clocks (because the sample clock is faster than on the counter source input signal).

• Source a current Sine using USRP N210 with Labview

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• external frequency step-down converter

  Hello

  1. I have a digitizer 5142 with a resolution of 14 (16) bit. can I change this rate of 8-bit scanning, or can I get a signal to 8 bits using 5142 I

  think I can using neither scope config. If yes also means I increased the speed of 200MBS 100MBS (since I am only

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  2 - I read this specification 5142 when I stumbled upon two things that I surrounded as JPG attachments

  a. filter anit-alisasing has a bandwidth of 40 Mhz, and default 5142 uses what it means. Can I use

  some other external down converter instead of 5600 and which can acqiure 40 Mhz bandwidth at any center frequency and I can feed to

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  scope/tuner vi.

  (b) the other is true flat bandwidth = 0.4 * rate and bandwidth flat complex sample = 0.8 * sampling frequency that we mean by these two.

  Concerning

  MADD

  Hi malala.

  1. correct me if I'm wrong. Insofar as I have defended frequency translation means that if I have acquired a signal at 50 MHZ with a 40 MHZ Bandwidth (F_high = 70 Mhz and F_low = 30 Mhz). My frequency step-down converter. If I select the option enable translation frequency and frequency set to 20 MHZ (option to activate with the SDC thus) signal that I have gained is now translated to 20 MHz (C.F), the maximum frequency to 40 Mhz and Minimum to 0 Mhz. Is it so? If this is correct, then I think that my Ghost will meet the requirement of the spectrum of nyquist and won't be mitigated...

  Not quite fact-frequency translation used to take your signal of a certain frequency IF complex base band (centered around 0 Hz). If you set your frequency of 20 MHz, 20 MHz will tune to your NCO and you will acquire some bandwidth, based on IQ rates, around this central frequency. For example, if you used 20 MHz bandwidth (rate of IQ = 25. MECH / s) and a center frequency of 20 MHz, get you 10 MHz to 30 MHz of frequency and translate this to baseband. Now you have your frequency content at +/-10 MHz.

  To do what you seem to want to do, you must set your frequency to 50 MHz as well as your IQ rate to 1.25xBW = 50 MECH. / s. This will mean your 40 MHz BW from 50 MHz to complex baseband.

  2. also mention that I can put this decimation is property invoke node or filter specifications.

  Decimation is another property of the OSP and the mechanism of the clock. Your decimation is defined by your IQ rate compared to your time base sample clock. For example, by default, we use a time base 100 MECH. / s for the 5142. If I put my IQ rate 2 MECH. / s, I will use a factor of the decimation of 50. Our table of decimation emphasises, however, that, in the range of 12 to 4 096, we can only use decimation integers that are multiples of four. So, we will eventually be forced in this case to 48 and a sampling rate of 2.0833 MECH. / s. You can then perform resampling to 2 MECH. / s in the software.

  3 - something else enable and disable the noise/anti-aliasing filter. Combination of maximum frequency of niscope configuration characteristic.vi. If I put it in noise filter 20 Mhz is on now and when I started 35 Mhz filter anti-aliasing is enabled. Is it so?

  That's right - your maximum frequency setting to be in one of these filters will allow this way. If I put a maximum frequency of 19 MHz, the filter is activated. If I put a max of 30 MHz frequency, the Anti-aliasing filter is enabled. 0 will default, and -1 will allow full BW.

  Kind regards

• Using the output with 6009 or 6216 possible buffer?

  Hello

  I have a USB6009 and a USB6216. I need to generate a signal by using the analog output and I would use the output buffer. My questions are:

  -The USB6009 has an output buffer? I always get an error, but I know from experience that this device is very limited, so I wonder if they have not only an output buffer... (Programs in input buffer are not a problem at all).

  -J' took the USB6216 and I tried the example WfmGenUp.c downloaded from somewhere in the area of the developer (sorry I lost the link but fix the code) but I am not all analog output signals and after you press ENTER to stop the program (depending on the show) I get this error message:

  NO MORTALS RUN - TIME ERROR: 'WfmGenUp.c', line 113, col 9, id thread 0x0000088C: DAQmxStopTask function: (is-200016 return value [0xfffcf2b0]). Measurements: On-board memory precision passing. Due to the limitations of system and/or the bandwidth of the bus, the driver could not write data to the device fast enough to track the rate of output of the device.  Reduce your sampling rate, change the method of transfer of data (from interruptions on DMA), use a product with more on-board memory or reduce the number of programs that your computer runs simultaneously. Task name: _unnamedTask<0> Code of State:-200016

  I don't know if the problem is just that the 6216 does not support the output buffering or the other...

  -So, if the output control is not supported by 6009 or 6216 what would be the best way to constantly generate signals to 100 s/s?

  Thank you very much

  Kristel

  Hi Ryan,

  the USB-6009 case has 150 s/s softwaretimed AO, so you won´t be able to use AO stamped with the module.

  The USB-6216 supported in the analog output buffer, just follow the recommendations that the driver gives you,

  for example by reducing the sampling frequency, if there is an overflow memory due to the limitations of system and/or the bandwidth of the bus.

  Experiment with the parameters and the basic to see in what range of sampling it works.

  You can find appropriate examples

  ANSI C:

  C:\Dokumente und All Anwendungsdaten Users\Dokumente\National Instruments\NI - DAQ\Beispiele\DAQmx C\Analog Out\Generate Voltage\Cont Gen Volt Wfm - Int Clk ANSI

  LabWindows CVI:

  C:\Dokumente und Users\Dokumente\National Instruments\CVI\samples\DAQmx\Analog Out\Generate Voltage\Cont Gen Volt Wfm - Int Clk Anwendungsdaten All

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• Physical connections using 4 counters with NI 9411 cDAQ chassis 9178

  Hello

  Currently I have a NI 9411 module in a 9178 cDAQ chassis.  I use 2 meter to read the frequency measures.

  The NI 9411 pinout diagram (see pdf file attached to this post), here are the links that I did:

  CTR 0 SRC, pin 1 ground COM

  DOOR of the CTR 0, pin 2 to the first signal of frequency

  CTR 1 CBC, PIN 6 COM/ground

  CTR 1 DOOR, pin 01:53 frequency signal

  The problem now is that I had like to use meters of 3rd and 4th in my 9178 cDAQ chassis, but I am confused how to wire

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  Configuration.

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  Anna

  Hi EETDer,

  Using 'C-Series Signal connections for counters that you found is a good resource.  One thing I want to point out, that's a measure of the frequency on a single meter, simply connect the source of the signal up to the door of the RTC.  Internally, the module will forward a database internal time appropriate to the source of counters, so DO NOT want to connect the Source CTR to the mass.  On your device, you will be just wire each signal to the source of the meter, so only utilizting pines 1,6,3,8 for your 4 frequency measurements.