Improvement of the aquistion of ADC pulse time

Hello

I use Labview 8.6 Professional version and an ADC NI PXI-5114 in a chassis PXI-1033 to capture some positives.  The pulse widths are in the order of 100 ns to 10.  The impulses can reach CDA at random times.

With the search here, I found some suggestions very useful and therefore following the examples of Labview OR-Scope my Foundation, I managed to set up a program that allows you to capture these impulses.  For now it works great except for one thing.  It will not capture consecutive pulses that are closer than 2ms.  It is too slow for my application, actually faster than I can be ready to seize the next pulse best.  If I can get this time back down to about 200 US, I'll be happy.  The ADC 5114 specifications indicate a time to rearm in the low microsecond range so I know the hardware is capable of doing much better that what I mean but this is translating to the software side of things gives me some difficulties.

As much as I know there is no trigger to start and stop captures data on one edge, so in my program I capture of basic data on extraction into pieces and use a signal processing subVIs to pick up the trailing edge of the pulse in order to know when to stop capturing data.  If the pulse width has been set then this wouldn't be a problem, but as I don't know what it will be, I prefer to capture just the pulse so that I don't miss other legumes.

Is it an inefficient way to solve the problem and what is perhaps originally the code is running slowly?

I would appreciate any help with a solution to this time getting 'rearm' down (or comment on my code and that you feel would improve it).  I've been using Labview for a few years (only to learn as I go), but it's my first shot using NOR-Scope and a digitizer high speed.

All suggestions are welcome!

Thank you

Daniel

More importantly, if you want to rearm fast, deterministic, you must use multi-record acquisition.  This sets up the device automatically and very quickly (depending on the configuration and device, 1us to 10us), rearm.  As you apparently don't know how long the pulse can be at any point in time, you must set up the record for a reference position length small (say 10% for 10% pre, post 90% trigger) and samples sufficient to cover your expected worse (10us + 10% pre-trigger + a margin engineering for a pulse that is wider than expected).

You can activate the multi-record acquisition by plugging in just in a number to Terminal "number of records" on the Horizontal VI to configure.  This will configure the digitizer to divide his memory embedded in N circular buffers to store individual records triggered.  It is the only mode that you can expect to get quick reset time on as host, recovery time, and duration of treatment are not the bottleneck.

Once you do this, you will need to make a few small changes to the rest of your VI existing to control what (s) you are to pick up.  I suggest you look at the examples of Multirecord NOR-Scope.  If the flow is a concern, you probably want to fetch multiple records at a time.

Tags: NI Products

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