Multiple Triggering

[cool]

Hi

I am using the NI-DAQ-16E-4 card and I am trying to start my data acquisition by applying the trigger signal on the PFI0/TRIG1 pin.The program DAQsingleBufExtTrig_Eseries says that after the DAQ_start function apply the trigger signal.How am I going to manage that?Because once I run the program with the compiler it starts the execution and how am i going to know at what instant i should apply my trigger?Is it the required that i apply my trigger signal at particular instant?

I want to do the data acquisition at every 1ms(that means i am applying the trigger signal on PFI0/TRIG1 pin every 1 ms). By mixing the programs DAQsingleBufExtTrig_Eseries.c and SCANsingleBufAsync.c
I managed to write the program for start the data acquisition f
or 1 external trigger(Program is attached).Wat should I do if i want to repeat this process at every 1ms?IS there any way to configure the DAQ card for this application?

Another question about the program i have attached is when i say start the multi channel scan acquistion on the PFI0/TRIG1 signal that means it will do 100 scans(if i have chosen 2 channel and 200 total data points)after the positive edge of the trigger signal.

Thanks


Thanks

[JoshuaP]

Unfortunately, the analog inputs do not have the retriggerable circuitry built into them. So you have to use the counters to control the external clock source for the analog inputs. I have include one example that I found for CVI that illustrates this concept, but there are several others on www.ni.com for LabVIEW that you could use as a refernce.

I hope this helps.

Joshua

[cool]

Thanks.
Can you give me the exact URL where I can find more these kind of programs.Do i need to have Labview installed?I dont have Labview and in which program I can open these .vi files?

[cool]

Hi

You said that "you have to use the counters to control the external clock source for the analog inputs."

I am not sure whether I have understood you correctly but this program will generate the timing using counters.In my case my trigger signal is coming at every 1 ms so i think i dont want to generate the timing signal,what i want is the way to configure the DAQ card so that it can take measurements on multiple triggering.Because on one external triggering I am doing 9 scans(total 72 points,9*8 channels).and after one sequence is completed I am going to move these 72 data points to some other buffer and repeat the process few more times,and then I am going to process these data points.

Does that makes sense?

Thanks