DAQ card on demand

[ASIM_BHATTI]

Hello every one

kindly tell me whether NI manufactures DAQ cards based on customer's specifications? and if yes what is method to put order?. 

Actually we want a DAQ card having 32 analog inputs , each being sampled simultaneously at 48000 samples/s with at least 14 bit resolution. and data should be out on 10/100 Mb ethernet port and dimensions of DAQ card should be within 50mm*100mm.Can NI manufacture DAQ cards based on these specifications?

[Brooks_C]

Hello Asim_BhattI,

National Instruments does not make customized DAQ boards, however we do have a wide range of products available that may already meet your needs.  You may want to browse the DAQ products available to see if they can work for you:  Data Acquisition (DAQ) Hardware  This page provides a nice interface for browsing the available hardware based on your measurement requirements

In general these DAQ cards come in a PCI, PXI or USB form factor.  The USB or PCI devices can be installed in your personal computer and the data is transferred directly into the computers RAM via direct memory access (DMA) channels.  PXI cards go into a PXI chassis and these chassis can have onboard controllers that are essentially laptop computers.  These systems can be deployed remotely and accessed via an Ethernet port if you need that, but in general our products are made to interact with a computer and transfer data directly.  If you need the Ethernet port to access data over a network then you can do this using the computer the card is in.

We have a number of cards with 32 analog inputs, but the sample rate/channel when all 32 channels are used is 1Ms/32 channels = 31.25 kS/s maximum (depending on the card) on each channel.  One option to get the full 48kS/s you've requested would be to get two cards and read 16 channels on each.  All of our newer boards at least 16 bit so that shouldn’t be a problem.

No particular product comes to mind that meets all of your specifications, but it’s possible we can find something to work if you can explain more about your application and needs.  The size requirement you've mention suggests that you're looking for more of an integrated circuit than a DAQ board.  Are you looking for an OEM device?  If so there are also a number of boards we offer in OEM versions.

Feel free to post back with more information about your application or call a technical sales representative who can help narrow down our product offering with you.  To contact National Instruments directly use the contact information found here:  www.ni.com/contact

I hope this helps and have a great day!

Cheers,

[ASIM_BHATTI]

Hello Brooks

Thanks for your concern. It took me a long time to reply but here i am again needing your help. Actually i have a project to design digital telemetry system for seismic arrays. For this purpose i need small sized ADC cards which can be fitted in approximately 60mm diameter arrays.No of channels per ADC card can be reduced but size and sampling rates can not be compromized. Any solution suggested is most welcomed.

Best Regards

ASIM

[dansch]

Hi Asim,

Thanks for posting back. Unfortunately, I believe that the things Brooks mentioned are still going to be applicable in this situation. It does not appear that there are any devices we offer that will fit into the form factor you are looking for. Is it possible that the actual card be removed from where you are actually connecting your signal through the use of a cable (meaning the card be in a computer which is connected to the array through a cable)? Also, if you have additional information about your application and exactly what you require, it may be easier to find an acceptable solution. Do you still require simultaneous sampling, or is the sample rate mainly what matters (I ask because it may be difficult to achieve a high channel count simultaneously since this will require a dedicated ADC per channel)?

The smallest DAQ device that I believe you will find is the USB-6009, but even this device is approximately 8.5 cm long and 6.35 cm wide without connectors. Also, it will sample at a max rate of 48 kS/s aggregate (meaning you will have to divide this value down for each channel, up to 8 single-ended or 4 differential), so you would probably need a single device per signal to achieve your desired rate, and you may not be able to synchronize each channel very well using this method. If you have any additional information regarding your application that you can provide, it may help in finding an acceptable solution. I would also strongly encourage you to contact a technical sales representative directly (www.ni.com/contact) who can work with you and discuss your application in-depth in order to find the best possible solution. Thanks, and I hope this helps!

[ASIM_BHATTI]

Dear Daniel

                       Thanks very much for your detail answer.We want to reduce no of data cables inside array (approx 60mm diameter) since it has more than 600 sensors in it.

Each sensor (with preamplifier) gives analog output voltage (SE) and with these no of sensors we need atleast 1200 data wires. For this reason our conclusion was that ADC cards should be inside array.

Simultaneous sampling is not necessary but per channel sampling rate (48Ks/s/Ch) is required.

Best Regards

ASIM