cruisers

[cruisers]

What will be sampling rate for PCI 7344 analog i/p.  Actually i want use 2 analog input and create the sample hold vi. My requirement is             1 Khz samples . Can i have solution for this . My email id is sy.sawant@gmail.com

[Jochen]

On the PCI-7344 you only can use software timing to sample the analog inputs. You should expect a maximum sampling rate of approximately 200 Hz when running an untimed loop. In this scenario you will see significant CPU usage and an also significant amount of jitter.



With this said I don't recommend the PCI-7344 for fast AI operations. Please consider using an M-Series as the PCI-6220 (PCI) or the USB-6210 (USB, bus powered), which provide much better AI performance, accuracy and CPU usage.

Best regards,

Jochen Klier
National Instruments

Message Edited by Jochen on 07-23-2007 01:27 PM

[cruisers]

Dear Sir,

Thanks for your  prompt reply .

I will purchase this card .  At present the scan time of my motion VI   is 25 ms. Do you think still by using this hardware with my motion VI i will be able to  get 1kHz  samples ?

Regards

Sudhir Sawant

[Jochen]

A board like the PCI-6220 runs with it's own hardware timing and transfers the data directly to the PC's memory (DMA). The boards that I have suggested are capable of sampling analog inputs with up to 250 kHz. In your application you don't have to retrieve the data point by point but blockwise (e. g. 25 or 100 samples per iteration) so you can implement the data acquisition either into your main loop or into a loop that runs in parallel.

Best regards,

Jochen