PXI 5105 - min record length varies with number of initialized channels

Hello everyone,
I'm having a hard time with this issue. Why the record length I acquire with "niScope Multi Fetch Cluster" varies, depending on how many channels I initialize? I.E., I want to fetch 20k data points per channel. If I configure and acquire from 1, 2, 4 or 8 channels, the record length of all signals is 20k points. However, If I configure 3, 5, 6 or 7 channels, the record length is 19934 points. Always 66 points less than the desired value, doesn't metter the configured record length, its always 66 points less. Doesn't metters which channels I initialize, only the amount of channels (it seems to be 2^n). And this is the record length immediately after the data acquisition block. To make things worse, the block "niScope Actual Record Length" returns the desired amount of points, and not the amount I'm actually reading.
Why is this happening?
If this rule is correct, I can figure out a solution.
Best Regards,

Hello Giovanno,
Please, to this question,contact the technical support in your country so that engineers will help you.
Thank You.
Rita Souza
Engenharia de Aplicações
National Instruments Brazil

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Fetch and peak detection all channels of PXI-5105 with 4M record... HELP!

Dear collegaues!
Please help me to improve performance my application, see attachment, and sorry for my English.
So, my task is to fetch and peak detection all (eight) channels of PXI-5105 with 4M record and sample rate 4M with loop 1 sec...
Inputs of all my channels are wiring to NaI detectors with 0,5...1 microsec of pulse width (really) and freq from 0 kHz to no more than 40 kHz.
Why I've selected 4M record and 4M sample rate namely? Answer is that I've tested PXI-5105 previously by generator 40 kHz and 0,5 microsec width pulse. It is working fine and peak detection indicate for me 40000 pulses/sec. If I set lower than 4M record and 4M sample rate it is no working. In my honest opinion 4M record and 4M sample rate are very min settings.
In the present time peak detection working only 6 channels... When I've connected to diagram more than 6 "peak detector.vi" - I see the error "...out of memory...".
Please advise me, what is to be done for that is all working fine.
Solved!
Go to Solution.
Attachments:
consumer-producer7.vi ‏44 KB

What you are running into is an out of memory error in LabVIEW. You have enough onboard memory to capture 4M samples per channel on the digitizer. The issue is with fetching and manipulating that data in your LabVIEW application. You will want to step back and take a look at how you are handling your data to understand why that is happening.
1) 4M samples/ch = 4M Samples x 2Bytes/sample/ch = 8M Bytes/ch
2) Expanding to 8 channels creates 64M Bytes of data in the raw binary format
3) You are scaling your data by fetching in a 1D WDT format. This stores each sample in a 32 bit double, expanding the memory to 256M Bytes (in addition to timing information)
4) By splitting up the array of waveforms and branching data it you can easily create copies of this data, and if your consumer loop is not completed with the last data, you may be trying to capture a whole new set, creating yet another copy.
So you can see that while you have 1.5GB of controller memory, when dealing with large arrays of data you can easily eat up that memory. There are several things you can try to make your application more efficient. You could work with an unscaled binary data format, you can wire the array of waveform directly to the peak detect vi (instead of creating 8 copies, you will have a single copy with arrays of output) or you could revisit the record size you have chosen (experimenting with your threshold and width settings might help you to get the results you want with smaller record lengths).
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Thank you for being a part of the Lenovo Family,
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Signal recording programme.vi ‏85 KB
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Post Author: anand.kolipakkam
CA Forum: Data Connectivity and SQL
hi all,
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Edited by: Don Williams on Jan 30, 2011 6:02 AM

PXI 5105 - min record length varies with number of initialized channels

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