Suggestions for digitizer streaming project - PXIe-5122

Spoiler (Highlight to read)
Hello All,
Hello All,
Spoiler (Highlight to read)
I need to work out a streaming solution for a 5122. I need to stream a "single" large record post triggered from a 5442 AWG via the backplane. The 5122 and the 5442 will be synched via Tclock. Checking some of the more straightforward examples (Fetch Forever and Fetch Forever with a digital trigger ) seem to trick the hardware by using the prefetch memory and prefetch arming trigger that doesn't seem to be applicable here.
I need to work out a streaming solution for a 5122. I need to stream a "single" large record post triggered from a 5442 AWG via the backplane. The 5122 and the 5442 will be synched via Tclock. Checking some of the more straightforward examples (Fetch Forever and Fetch Forever with a digital trigger ) seem to trick the hardware by using the prefetch memory and prefetch arming trigger that doesn't seem to be applicable here.
Spoiler (Highlight to read)
The streaming would be at full digitizer speed (100MS/s) over a x8 MXIe link to the PC.
The streaming would be at full digitizer speed (100MS/s) over a x8 MXIe link to the PC.
Spoiler (Highlight to read)
The perfect solution would have a CVI analog solution.
The perfect solution would have a CVI analog solution.
Spoiler (Highlight to read)
My first guess is that I will need to setup a process based on Mutli Record Fetch More than Available Memory and then compile everything back together post acquisition. I am just checking to see if I am on the right track. If so I wil head a bit farther down that road.
My first guess is that I will need to setup a process based on Mutli Record Fetch More than Available Memory and then compile everything back together post acquisition. I am just checking to see if I am on the right track. If so I wil head a bit farther down that road.

Hey blakney,
It sounds like you are on the correct path to me. That is the best example because you are going to fill up memory really quickly at those rates.
TimC
National Instruments
Applications Engineer

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PXIe-5122 continuous stream 2 channels to disk with 100MS/s

Hey,
I am currently trying to find a way to stream 2 channels to disk with 100MS/s with my PXIe-5122. According to the product specification, the card should be able to do this.
Unfortunately, I have'nt seen any programs.
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Hi lehrm,
you are writing about that you didn#t see any application for the 5122. If you mean examples, there are a lot of examples installed on your system when you install the driver sw for the device. eg. there is an example called niScope EX Stream to Disk, that seems to be interesting for your issue
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This can give you first ideas!
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Thanks for the input. With regards to the file format, the decision has been made by my superiors not to use TDMS - unfortunate, but NI hasn't provided the information to write a MatLab file reader, which is a requirement. So, I've created a custom file format tailored to the needs of my application, but generic enough to be used for other apps. With it, I've been able to stream 8 channels at 800KHz (4 channels each from 2 PXI-6120s) without breaking a sweat. However, the performance varies greatly depending on which slots the cards are in (but that's a whole different discussion - see the PXI forum for that one). Once NI solves that one, I'll feel a lot more comfortable.
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I have a small query about PXI 5122. In Data Sheet its written that " The PXI-5122 also can stream data continuously from onboard memory to host memory for longer acquisitions and streaming to disk. "
So do we have to write some code for streaming the data on hard disk or when drivers of this card is installed then some VI's will appear in control panel through which we can stream data on hard disk ??
I hope you all understood what my query is. Please let me know for further details
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Satyam Development Center, Banglore, INDIA

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u have to write some code for streaming the data on hard disk,
for any applications using labview u need to do coding........
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to know more about digitizers (C:\Program Files\National Instruments\LabVIEW 7.1\examples\instr\niScope\niScope EX Getting Started.vi)
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find examples \hardware input output \modular instruments\ NI-scope(high speed digitizers)
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Attachments:
Stream data to Disk1.vi ‏172 KB

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Attachments:
Impedance Analyzer Software June 2012.vi ‏419 KB

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PXI-5122 External Sample Clock

PXI-1031 Chassis
PXI-8106 PC
PXI-5122 14bit 100MS/s Digitizer
Labview 8.5
I am driving X-Y mirrors steering a laser.
I am measuring the reflected light
to develop a raster image of a sample.
I have a pixel clock running at 60MHz that
I want to clock the acquistion and external
trigger that defines the 'line valid' or sampling
across the mirrors during their constant velocity
range.
I am using [PFI0 with 'READY for START EVENT'] as
a start pulse to run my x-y mirror scan.
CH0: Analog signal
SMA TRIG: line valid
AUX: PFI0 with 'READY for START EVENT'
In the property node 'niScope'
when I add the following elements:
Sample Clock Timebase Source = VAL_NO_SOURCE
Sample Clock Timebase Rate = 60000000
Sample Clock Timebase Divisor = 1
I get the following message:
Error -1074118614 occurred at Error occurred at: niScope Fetch Binary 16.vi:2
Possible reason(s):
Driver Status: (Hex 0xBFFA402A)
An acquisition has not been initiated.
Error -1074134971 occurred at Property Node (arg 4) in CSKB-4X_VID.vi
Possible reason(s):
The channel or repeated capability name is not allowed.
Attribute: NISCOPE_ATTR_SAMP_CLK_TIMEBASE_SRC, Channel: 0
Attached are the VIs with the elements added to the niScope property node
and without.
I get the above errors even when I set the 'Sample Clock Timebase Source'
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It appears, by just adding the elements, it gives me the error(s).
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Solved!
Go to Solution.
Attachments:
CSKB-4_VID.vi ‏148 KB
CSKB-4X_VID.vi ‏146 KB

Hi csk,
I was wondering if you could clarify how many
samples you wish to take. Am I correct that you wish to take 30,000
sets of 150 samples each, or do you mean you want to take 150 sets of
30,000 samples each (since 30,000 periods of the 60 MHz clock fits
within 90% of a 1.8kHz signal)? In either case, the current method you
are using is only going to acquire a single record each time through
the loop, and so you will be limited by how fast you can retrigger in
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For your application, it sounds like you will
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Memory.vi" (found at Start » Programs » National Instruments » NI-SCOPE
» Examples). With this VI, you can specify that you wish each record to
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the case) and that you wish to acquire 150 records (or 30,000 if this
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configuring the external clock) you should be able to accomplish what
you need. Please let me know if I explained this alright and if my
assumptions are correct. Thanks, and best of luck!
Daniel S.
National Instruments

Suggestions for digitizer streaming project - PXIe-5122

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