PCI-5105 FetchForever with 2 or more channels?

I use the PCI-5105 and MS Visual Studio 2008 to pick up a signal.  I based my code out of the FetchForever example and it works very well for a channel.  I now need to continually monitor 2 channels.  Can someone help me building this?  The example allows only one channel.  Maybe there is a better way.  Currently I use algorithms on the data from one
channel.  When there is a signal that triggers in my code, I save
~ 25 ms of data on this channel.  My goal is to now record two channels when the first string triggers in my code.

Thank you

Tom

Hi Tom,

What is your ultimate goal in terms of data acquisition?  I understand that you would like to acquire the 2 lanes of a data value, but it is is not clear as to whether you want continuous samples, several records of samples, the last available samples etc..  There are many possibilities.  Also, do you need to correlate the data to a trigger?

Assuming that you are looking for continuous data, you want to stay with the example FetchForever rather than try the configured Acquisition example (I would refer only to see how 2 channels are recovered).

FetchForever is not the most intuitive examples.  So, here's a quick explanation of how/why it works: continuous data Acquisition

Basically, a reference trigger is a trigger that tells the jury when to stop the acquisition.  By defining this trigger to the software, do us the digitizer to wait for a trigger and guaranteeing that he will never get a (because we're not going to send a).  Records are normally formed around the trigger of the judgment, and when search you, you get recording including pre and post release samples.  In this case the digitizer is permanently by filling a buffer of samples that could potentially become before triggering samples (if a trigger has been sent). We simply use the reading pointer to follow the samples we have already read & so what samples to read further.

checkErr (niScope_SetAttributeViInt32 (vi, VI_NULL,
NISCOPE_ATTR_FETCH_RELATIVE_TO,
NISCOPE_VAL_READ_POINTER));

The reason why your application reads the same data is that you are setting and triggering a single record, then go get this record over and over again in a loop.  There is no manipulation of the stylus, and you sent a trigger immediate reference so the digitizer has ceased to acquire new data.

As a side note, to avoid surprises, you can consult your weighing to non-automatique functioning NOR-5105 for valid sampling rate and voltage ranges.  Based on a sampling 8V and 8MS/s rate, your actual settings will be converted to 30V and 60 M/7 = 8.5714 MS/s.

-Jennifer O.

Tags: NI Products

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