External sample clock change takes a lot of time on the SMU-5186

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  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.

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• PXI-5122 external sample clock

  
  

  Hi csk,.

  I was wondering if you could clarify how
  you want to take samples. Am I right in taking 30 000
  sets of 150 samples each, or do you mean that you take 150 sets of
  30 000 samples each (since 30 000 periods of 60 MHz clock corresponds to)
  less than 90% of a 1.8 kHz signal)? In both cases, the current method you
  are using only will acquire a single record each time by
  the loop, and so you will be limited by how fast you can retrigger in
  software.

  For your application, it looks like you want
  need to perform a multi-record acquisition, which will allow you
  specify what condition to trigger off of and how many samples of
  acquire whenever the trigger occurs. In this way, each 'transition' of the sawtooth wave is considered to be a single record, and you buy several different corresponding records whenever a rising edge trigger occurs. I think you can accomplish
  exactly what you need with only a slight modification to the niScope
  example of expedition "niScope EX Multi Record go get more available»
  Memory.VI"(se trouvant àles Start» Programmes» National Instruments» NI-SCOPE)"
  ("Examples). With this VI, you can specify that each record you want to
  have a record length min to 30 000 samples (or 150 samples, if it
  the case) and you want to acquire 150 records (or 30 000 if this)
  that is the case). The only big change that you need to do is to
  change the trigger VI set up to be a digital dashboard rather trigger
  only an analog trigger. With that and a few other changes (i.e.:-)
  setting the external clock), you should be able to accomplish what
  You need. Please let me know if I have explained well and if my
  assumptions are correct. Thanks and good luck!

• Synchronization of analog and digital output with the external sample clock

  Hello

  First of all sorry for my English, I will try to explain what I want to do.

  I want my PCIe-6321 to send two custom signals (modification sawtooths) on a mirror controller. I would also like to generate output with my card at the beginning of each tooth of saw. Everything must be synchronized with an external k-clock signal of 100 kHz. The idea is that whenever the PCI receives a trigger to external clock, it sends two analog output voltages and when he received 1024 clock ticks it will also send a pic of triggering TTL. What I do is first prepare the map and after that in a loop sending and modifing the output values of the two signals and at the same time send a digital signal Boolean in each arch, so when's done it 1024 iterations of the loop I send an event to the digital port. Attached you can see.

  The problem is that I don't know how to synchronize both. Can I use the sample clock just to the analog output? I can use sample for the two outputs clock, or do I need to use the output of the meter? If don't know how to use it here.

  If I do nothing else bad/wrong, I would be grateful for feedback.

  Thanks in advance,
  Pablo

  I don't know how but I find the solution. I'm generating more than a positive value (as I was triggered maybe very fast the oscilloscope has been absent there). If I put the sample clock of digital output to use the sampling/ao/Dev1 clock that it doesn't, but if I put to use the same source as the OD (terminal where my external clock is connected), but the trigger to start the DO to be Dev1/ao/StartTrigger this works. I don't really know why, but it does.

  Thank you for your patience and your help. I put here the final code.

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

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  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.