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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
11-30-2011 03:19 AM
Hi!
How can I determine available sample rate for this board? What mean "181.9 uS/s increment" in the datasheet?
Jury
12-01-2011 11:01 AM
Hi Jury,
I'm assuming you're looking at the 4462 spec sheet?
Your available sample rates range from 1 kS/s to 204.8 kS/s. 181.1 uS/s is the smallest amount you can increment your sample rate.
Thanks for the question,
Lisa
12-01-2011 11:26 PM
Hi Lisa!
Thank you for answer!
I read 4462 spec sheet.
If 181.9 uS/s mean that available sample rate is:
1000 Hz
1181.9 Hz
1363.8 Hz
... and so on.
Jury
12-05-2011 09:55 AM
Hi Jury,
The 181.9 uS/s means 181.9 microSamples/second. Thus, your available rates are [1000, 1.0001819, 1.0003638...] Hz.
Thanks,
Lisa
12-05-2011 03:14 PM
Hi Lisa!
Thank you for answer!
Is the value 1 kHz and 181.9 microSamples/second precise?
We planed to use PXI-6653 10 MHz oscillator, disciplined by the PXI-6682 GPS for precise time sync. I must know perecise SampleRate if I want to calculate time of the Sample as [SampleNumber]/[SampleRate] with GPS accuracy for long-time record (about 10^4 and more seconds).
Can you say me, how can I calculate the increment of 181.9 microSample/second?
Usually, the sample rate can be obtained as some inner frequency divided on the integer number.
Jury
12-06-2011 08:50 AM
Hello Jury,
Please find this information in the general DSA manual under Timing and Synchronization, then Sample Rate and Update Rate, Accuracy and Coercion.
Calculating the coerced rate depends a lot on your individual system set up.
Feel free to let me know if you have any specific questions.
Lisa
08-07-2012 06:56 AM
Hi Lisa,
Did you manage to configure and test the system?
I also would like to obtain precise disciplined clock using PXI-6653 and PXI-6682. I was wondering if you could give me some guidelines about timing and synchronization aspects in LabVIEW. I know right now how to configure the DSAs using DAQmx and how to trigger DSAs using niSync however it is of great unknown how to route the signals between PXI-6682 and PXI-6653 and how to send the timebase from PXI-6653 to DSAs via backplane. I have PXI-4495 as well as 4472 in two different chassis. I also started a separated topic here since this seems to be quite complex issue.
Thanks for help in advance.
--
Łukasz
08-08-2012 08:49 PM
lukko,
TylerK provided some great advice in your other thread regarding clock disciplining your multiple remote chassis. However, you may not actually be able to synchronize your PXI-4495 with your PXI-4472 in one chassis. The PXI-4472 only supports synchronization by sharing the oversample clock over the backplane PXI star trigger lines. In your case this would be generated via DDS on the PXI-6653 and routed to the star trigger lines. The PXI-4495 doesn't have star trigger lines available because it is a hybrid-slot compatible module. PXI-4495 modules are synchronized by sharing the 10 MHz backplane clock and generating their own oversample clock on board via DDS with a 100 MHz crystal oscillator. You can still trigger the acquisition from the two cards together, but you may not be able to discipline the clocks together in a single chassis.
08-28-2012 08:04 AM
Hi Jared,
Thank you for the reply. Could you take a look and suggest something about this issue (link)?
Thanks!
--
Łukasz