PXIe6280- Analog Input acquisition with higher sampling rate provided by external clock source

[yenaslab]

Hello!

I am using PXIe-6280, I need to acquire analog voltage but with higher than 500KS/s. May I use external clock to feed the ADC with external clock?

Thanks,

Yenass

[Kevin_Price · Accepted solution]

No, that's not going to be able to work to "trick" the board into sampling much faster than it's spec'ed to handle.  Here's a little more detail from another recent thread.

If you need to sample faster, you need a board that's spec'ed to handle the sample rate you need.   Note too that your board is spec'ed for 500 kHz *AGGREGATE* sample rate.  There's a subtle distinction with DAQmx task terminology here.

The *aggregate* rate is the DAQmx task sample rate multipled by the # channels in the task.   In DAQmx terminology, 1 sample means one measurement of every channel in the task.   In the spec sheet, *aggregate* sample rate is more like the max ADC conversion rate.

-Kevin P