Hello all,
I am using LV 8.2, PXI-5122, PXI chassis PXI-1042Q, Windows XP
I am trying to drive the PXI-5122 DAQ card with an external clock and it seems to work when the clock is a continuous signal. Unfortuneatly for my application I require the clock signal to be very similar to a burst as I only need to acquire data in a periodic matter with a very short "no clk signal" down time (<1e-6s) between successive burts. More exactly, I need to send 512 cycles of a 43MHz signal (can be sine or square) and acquire data on the rising edge of each cycle, then wait until the next series of 512 cycles. I know that this could be accomplished with the internal clk, but unfortunetly my clk signal will eventually need to be chirped (ie. 46MHz to 40Mhz over the 512 cycles). When I try this I get the following error "
The error (BFFA49D9 or -1074116135 or DAQmx -200550) message reports a hardware clocking error." I guess my first question is, Does the external clk funtion for the PXI-5122 have to be continusous or can it be set up like a burst? Secondly, has anyone out there used a chirped signal with any of the NI digitizers as a clk to drive there data acquisition? Thirdly, is my solution the right approach or do any of you cleaver people have a different method of acquiring data with the PXI-5122 where the clock is not set to a constant frequency but in fact can be slightly chirped? Any help would be greatly appreciated.
Thanks,
Azazal
Azazel
Pentium 4, 3.6GHz, 2 GB Ram, Labview 8.5, Windows XP, PXI-5122, PCI-6259, PCI-6115