How much time can we capture the waveform using PXI 6259 DAQ?

[Ramaiah]

Dear Technical support members,

Please can you help me understanding on the below scenario.

1. Can you provide the time how much time can we capture the waveform? (Using any one of the Analog Input port)
2. If we increase time duration does it effect the sampling time?
3. Basically I want to capture waveform duration of 30msec and do the analysis on this one. This will happen frequently(After 40msec again I need to capture the 30msec duration waveform with the same channel)

I am waing for your earlist reply.

Thanks,

Regards

Ram 

[RobertoBozzolo]

I'll try to respond even if I'm not part of technical support crew! 

On finite acquisition like the one that you probably need to use you can set the exact time your task will last by appropriately setting both the number of samples to acquire and the sampling frequency. These are the basic parameters that affect acquisition process: to acquire for a longer time you need to raise the number of samples to acquire or reduce the sampling frequency.

Some examples: acquiring 1000 samples at 1000 samples/sec will last exactly 1 sec; sampling at 10kHz, the process will last 100 msec, at 100 kHz it will last 10 msec.

I suggest you first determine how much samples you need to analize your 30 msec process, next determine the appropriate sampling frequency to get those data out of the board. Next you could check whether the board is capable of acquiring all the samples you need on all channels: considering the maximum sampling frequency of your 6259 this is probably not necessary unless you sample a very large number of channels at very high rates.

Being capable of process acquired data in the 10msec free between two acquisitions depends essentially on the amount of post-acquisition processing you need and the capabilities of the PC you are running your application on: it cannot be determined without knowing these elements.