Synchronization of analog and digital output with the external sample clock

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• Measurement error of the County of edge by using the external sample clock

  Hello

  I'm trying to measure the number of edges (rising) on a square wave at 5 kHz with a generator function on a device of the NI PCIe-6363. I configured a channel of County of front edge of counter at the entrance of the PFI8 device. I use an external sample clock that is provided by the output of the meter of a NI USB-6211 housing channel. If I acquire for 10secs then ideally I would expect to see a total of 50000 edges measured on the meter inlet channel. However, my reading is anywhere between 49900 and 50000.

  When I use the internal clock of time base to measure the edges, the measure is accurate and almost always exactly 50000. I understand that when you use the external sample clock, the precision of the measurements is subject to noise level of the clock signal. However, I checked the clock signal is stable and not very noisy. Any reason why there is an error of measurement and how tolerance should I expect when using an external sample clock compared to when you use the internal time base clock?

  Also, what is best clock Frequency (with respect to the frequency of the input signal) when using an external clock?

  Thank you

  Noblet

  Hi all

  Thanks for all your sugggestions. I was using an input signal with a function generator which had a range of 8V. It turns out that the reduction of the amplitude to 5V solves the problem. I was able to get accurate numbers with the 6211 external clock.

  Thank you

  Noblet

• Do not connect ANALOG and digital grounds when the annotation to the front at the UB

  I'm finding randomly more often when I annotate with impatience to UB analogous and digital patterns do not connect.  In addition some power to the IC pin connections are unable to be connected in UB.

  Connect to the digital terrestrial analog ground is checked in my properties of Ms.

  Is there a reason for this?

  Thank you.

  Tien Pham offers this solution that worked:

  I saw the ground issue in the file you sent and you can fix it by replacing
  the digital ground with the one from V12.  On the Spreadsheet View, click
  on the "Components" tab, select all the Dgnd symbols, next click the
  replace icon on the Spreadsheet to replace all symbols at the same time.
  

• Fortunately the cRIO merger two time real screws: analog and digital output

  Howdy,

  I need help with a cRIO code.  The purpose of the code is to acquire an analog input from the NI 9234 c series module and be able to send a "signal of pulse" digital camera (first low for some time, t1, then high for some time, t2) from a NI9401.  Separately, I wrote the code to perform both tasks.  However, when I add the code of RT digital output pulse pulses to analog input RT code, the DMA FIFO overflows because of the way that my digital pulse output code works.  Currently, there are two reasons which overflows of the FIFO:

  1. The digital output code is pending for a while loop (pending "Send Pulse" become a true), the loop I can't empty the buffer FIFO
  2. The FIFO is not enough, quickly emptied depending on how long the pulse (t1 and t2) times are.  The way I keep the pin high or low for a defined period of time is by issuing a sleep command, which blocks the loop I empty the FIFO.  (Is there a "best" way to sleep?)

  I have attached photos of my codes FPGA and RT.  Please give me a suggestion on how to marry my two loops of RT for the use of happy resources!  Thank you.

  I found a quick way to solve this problem.  I moved the timing of the Digital pulse on the FPGA.  So whenever I have a Boolean value, the FPGA generates a waveform with the settings I put (a pulse in my case).  This works because the FPGA loops run in parallel, I think.  That's why, when I run a pending order in the loop of FPGA digital output, it does not prevent the FPGA of analog input loop to run.  I have attached a picture of the code.

• Looking for USB DAQ for AO using the external sample clock

  Hi all

  I'm looking for a cheap solution for the acquisition of data to select the AO using an external digital signal as sample clock, and I just realized that the USB-6001 is not a good candidate. Please someone remind the cheapest USB version for this task? There no need for high sampling rate. Thank you.

  Define cheap and low sampling rate. You've already been told on the 6211.

• analog and digital data synchronization

  Hi all

  I would like to help with what I seek to accomplish, if you don't mind much.

  I'm trying to synchronize the acquisition of analog and digital modes using a common trigger that launches both types of data collection at the same time. What I've done so far, is wasting his time trying different combinations to gather examples of LabVIEW 2011 on the synchronization of data - namely the 'Multi-multifunction-Synch AI lu Dig Chan.vi' and 'Multi-Device Synch-Analog Input-Finite Acq-Analog Start.vi.

  I tried to combine the two, because one contains digital and analog, the other contains the trigger for multiple tasks.

  I guess I should place the trigger (either digital or analog-eventually I will want to choose) then call the "Get Terminal name with device Prefix.vi. But from there I'm not sure wheter to connect the name of the terminal of the sample clock digital channel or a digital leading edge of the digital chain trigger.

  Also, the way it is wired now I get errors at the local terminal name, so I don't know exactly where this terminal must come from.

  I try my best, I could use a little help, I have attached my attempt with the examples that I speak to you.

  Thank you.

  Hi beefcake.

  The CtrInternalOutput internal output line is used as sample for your digital output sample clock source clock. If you change the settings for your CO Pulse Time is Dev1 and your digital output is Dev2, you will notice that the name of the product terminal would give Dev2/CtrInternalOutput. So what you get here, it's as well as the digital output device sees his sample clock, instead of the clock itself.

  If you just want to use a digital/analog input as your trigger, you should do something more as in the example above. Do you use multiple devices, or are all your lines on the same device? This example is more complicated because it is synchronization of signals on several devices.

  Looking at how this VI is wired, you can see that the digital signal triggers the analog signal. You want the analogue signal must be started first, so that when the digital signal triggers the analog task is already running and can trigger immediately. If the digital task started first, it can trigger until the similar task had started, and they do not exactly trigger at the same time.

  I hope that clarifies things. Kind regards

• Producer consumer with inputs and outputs analog and digital

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  I'm working on a program of control system for some practical test work. Currently, I am working on the data acquisition of the Labview program component. My architecture is consumer-product loops with a what. My system will have analog inputs, outputs, analog inputs and digital outputs. It is not a criticism of time sytem, but I wish that all the acquisition of data to synchronize. I enclose my program because it is at the moment. I have difficulties to get all the data in the since that I have two types of data. In addition, I don't know if I have synced the four sequences of read/write correctly. I would be very happy if someone could take a look at my program and give me some advice. Thanks in advance.

  
  

• How to trigger and outputs analog and digital Outout tasks begins on a counter to start?

  Hello

  I'm trying to synchronize the start of a task outputs analog, a task of digital output and a task of counter. I want to start the counter to serve the master trigger and analog and digital tasks to synchronize his departure.

  I guess I need something like:

  analogOutputTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("?", DigitalEdgeStartTriggerEdge.Rising);

  digitalOutputTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("?", DigitalEdgeStartTriggerEdge.Rising);

  analogOutputTask.Start (); Slave 1

  digitalOutputTask.Start (); slave 2

  () counterTask.Start; n / / master

  Where? is a string specifying a command source for the beginning of the task of the meter. However, I can't find what this string. Any suggestions?

  Thank you!

  -Jon

  Just FYI, the solution to this problem as well as some other ones is encapsulated in a short example .NET, I created. It is on the Web site of EITHER:

  http://decibel.NI.com/content/docs/doc-15500

  This project shows how to synchronize all your analogue/digital outputs through tasks and forums in terms of synchronizing Calendar and start clock.

  -Jon

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• NEITHER USB-6343 analog and digital grounds

  In the manual for the NI USB-6343, it is said that the mass input/output, analog and digital terrestrial are related, but by a small sign. For my application, I am attaching all 3 these grounds to exit the box (I'm tie all areas with physical threads). It is perhaps a silly question, but it's OK to do, correct?

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  Hi, I have a card PCI-6023E and LabVIEW 8.5 and I need is to configure the digital output on the card, but did not.
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  I am a beginner in Labview and would welcome advice on how to solve the following problem.

  I'm setting up a train of pulses TTL and would like to send in Labview as input.  Each falling edge detected on the input signal, I would like to as Labview to generate 4 pulse digital output.  For each output pulse, I would like to be able to specify the period and duration.       The image should illustrate more clearly, with the figures showing the expected scale.

  

  System: NI PCI-6733 data acquisition card, Labview 8.5

  My daq card has 2 timers 24-bit and 8 e / s digital, but I don't know what the best approach is to create between the pulse output of 4 to 8 of this precision... should it be handled at the hardware or software level?  And how would I go about it

  Thank you

  -Sidney

  Hi noli.

  I found the problem, in fact PCI-6733 support only avoiding the digital output. The timing of software is limited to 1 kHz in case better.

  I'm sorry, but this function is not possible with a PCI-6733.

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