Help needed with my application

[Cimteker]

Hi,

Can you take a few minutes and suggest DAQ hardware for my application? I need to measure a high freq signal from a quadrature encoder and correlate it to my 48 analog inputs. I need to know the speed of my motor when the analog measurements are taken. The signal from the quadrature encoder is a 1.7 MHz squarewave ( I can loose some resolution and slow it down ). I was planning on using PCI-6071E but I am not sure if it is suitable any more.

Thanks a lot

Jerry.

[Laura F.]

Hello Jerry,

If you are going to do analog input measurements and a frequency measurement with this board, I believe you should be fine.  You may want to check out this tutorial on making frequency measurements.  If you have not purchased the hardware yet, you may want to consider using an M Series DAQ device instead, if one suits your needs.

Hope this helps,

Laura

[Cimteker]

Thank you Laura,

Can you comment on feasibility of making simultaneous counter and AI measurements? Would I need some sort of hardware trigger? What hardware ( DAQ card ) would be the best for this purpose to give me the best accuracy for the best price? Once again one of my signal comes from quadrature decoder and is in 1.7 MHz range and the rest ( 48 ) are analog TTL signals

Jerry.

[Laura F.]

Hi Jerry,

You can run analog input and counter tasks concurrently.  You can start them using software timing basically at the same time which may be fine for your needs and is the easiest to implement.  You also can use a hardware start trigger to start the tasks if you prefer.  It all depends on the level of synchronization you need. 

You have not mentioned at what rate you will be acquiring data on your analog inputs.  The M Series PCI-6225 has 80 analog inputs and may suit your needs.  You will need to know what sampling rate you are trying to achieve.  Any M Series device will definitely give you the best value. 

Hope this helps!

Laura