Usb-5132 slow

Hi everybody,
our application requires collecting short signal waveforms (about a few thousand points at 50 MHz sampling rate) with repetition rate at least 20 Hz. We were happy before with Labview 7.1/NI Scope 3.4/ USB-5132/ Low end Dell laptop combination. The experimental setup allowed us easily collect data at about 100 Hz repetition rate.
Our data acquisition program is based on standard example program "niScope EX Configured Acquisition" from "C:\Program Files\National Instruments\LabVIEW X.X\examples\instr\niScope NI provides with every "NIscope" software.
We bought "Labview 2010 Developer Suite", which we installed on newest "Dell Precision M 4500" laptop. But we found USB-5132 now allows us collect data waveforms only at about 10 Hz repetition rate - 10 times slower then with old labview 7.1!
I tested the data acquisition speed with standard "niScope EX Configured Acquisition" program I mentioned above with the trigger set to "immediate" and found the same difference: the sample from NI Labview 7.1 works about 10 times faster compared to new Labview 2010 when the same usb-5132 digitizer is used.
Like I already mentioned, we need at list 20 Hz repetition rate, better more, and we would like to keep easy-to-use USB-5132 digitizer. Can we make it work faster with new Labview?
Thanks,
Yuriy.

Hello Yuriy,
My apologies for not seeing this post a few days ago when you originally posted, but Kyle recently brought it to my attention (I usually monitor the High-Speed Digitizers board but don't always catch posts on the LabVIEW board).
I have done some benchmarking with various versions of the NI-SCOPE driver and a USB digitizer. Unfortunately, it appears that there is an issue in NI-SCOPE 3.6 and later which is causing the fetch (read) rates to be drastically decreased with the USB digitizers. We are implementing a solution to correct this problem and get the fetch rates back to their previous performance values. NI-SCOPE 3.8 will address this problem, though that version will most likely not be ready for release until late Q1 2011. In the mean time, the best option is to downgrade to NI-SCOPE 3.5.2 or earlier if it is possible for the specific LabVIEW version in use. If this downgrade is not possible, please contact National Instruments support by phone or email with your specific details and we will work with you to determine the best solution.
We apologize for any inconvenience this has caused and we appreciate your help in informing us of this issue. Please let me know if there is anything else I can do to help out!
Regards,
Daniel S.
National Instruments

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External reference for USB 5132

Hello,
I have a couple (hopefully) general questions about using an external reference clock on our USB 5132 digitizer. We want to lock it to the other oscillators in our system, all of which are presently locked to one 10 MHz reference. If I connect our existing 10 MHz reference to the PFI1 input, my questions are:
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Best regards,
Penny
Solved!
Go to Solution.

Hello Penny,
1. Yes the 5132 is locked to your reference system 10MHz clock (with some offset due to delay in the time it takes to transmit the clock signal from your system to this USB device) if you selected the PFI line as the source of an external timebase. Please take a look at the following example Help>>Find Examples>>Hardware Input and Output>> Modular Instruments>>NI-Scope>>Features>> niScope EX External Clocking.vi.
2. No, although I would expect that if you enter in 13MHz and your device was not capable of doing this it would coerce it to the closest value. I would suspect that only integer divide downs from the clock in question are valid such that 12. 5MHz is the value it would coerce to if you were to request a 13MHz value (with a 50MHzexternal clock). The 5132 can not do RIS so sampling at 20MHz with a 10MHz SampleClock Timebase Source is not feasable.
Regards,
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National Instruments
www.ni.com/support

Utiliser un câble coaxial 75 Ohms avec ni usb 5132

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dans le cadre d'un projet, je dois acquérir des signaux analogiques vidéo et l'une des contraintes et d'utiliser des câbles coaxiaux (BNC) 75Ohms (d'un côté parce que c'est de la vidéo et de l'autre car ils sont disponibles).
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Mais peut être suis-je dans l'erreur?
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Effectivement, je pense qu'il faudrait utiliser un adaptateur d'impédance, disponible sur des sites spécialisés. Ou alors créez votre propre circuit imprimé.
Cordialement,
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USB-5132 ext clock + Trig ?

Hi -
We need ~20 Mhz for 100mS samples, 8 bit , high clock accuracy with big (>3kV) isolation. We have been looking at a USB-5132 , with an optical-fiber to USB converter and supply 5V that floats with the source. We need it to sync with clocks to <10ppm, and while we could run PF1 from our isolated clock system, then we wouldn't have a trigger.We had been hoping to set up the 5132 to acquire whenever it saw a clock pulse, as we can gate or otherwise process our clock signals. I see from other posts though that the 5133 won't do continuous mode so probably not the 5132, eh ? Triggering from the inputs or in software is not an option, unfortunately (would have to trigger 500mS back) Also I had been hoping to find programming or detailed user manuals online but don't see them. Another option I suppose would be a 2 ch ethernet digitizer, but the low cost and ease of use makes the 5132 attractive, as this might be the first of a bunch more. Thanks for any input.
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The page Matt pointed to, http://zone.ni.com/reference/en-XX/help/370592E-01/TOC6.htm , has the outline of a programming guide. Each link points to a valid page there, but I only found a bit on those pages, e.g.
http://zone.ni.com/reference/en-XX/help/370592E-01/digitizers/step_3-configuring_your_application/
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Array Measurements with the NI-SCOPE Measurements Library for National Instruments High-Speed - NI D...
NI-SCOPE Measurements Library for National Instruments High-Speed Digitizers/Oscilloscopes - - NI De...
Triggering with High-Speed Digitizers - NI Developer Zone
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Browse
Search within results:
Triggering with High-Speed Digitizers
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NI High-Speed Digitizers: Optimized for Automated Test
...resolution digitizer, the NI PXI...high-speed digitizers in particular...integration with other types...which NI high speed digitizers...timebase and triggering of several...problems with product quality...alignment with triggering. NI’s...to all NI high-speed digitizers, employs......
and 76 others. thee first two don't work today.
"Triggering With High Speed Digitizers" points to
http://zone.ni.com/devzone/cda/tut/p/id/4363
and "NI High-Speed Digitizers: Optimized for Automated Test " points to
http://zone.ni.com/devzone/cda/tut/p/id/7970
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Hello
I use NI USB 5132 and try NI Scope example measurement library.
I wonder why I can not get frequency info of input signal.
Thanks
Solved!
Go to Solution.

Thanks for kind responses.
I am using LabVIEW 8.6 on Windows vista and an example called niScope EX Measurement Library.
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