an error with Hardware Timed single point timing

[gotostudy]

I use the DAQmx assistant to config a task. The

task is a Hardware Timed single point timing. A new

task is generated bye generate code with

configuration and example from the task by

assistant. But it dosen't work well even the rate

is very low. The Vi is attached.
When runs, it reports:
Error -209802 occurred at DAQmx Wait For Next

Sample Clock.vi
Possible reason(s):

DAQmx Wait for Next Sample Clock detected one or

more missed sample clocks since the last call to

Wait for Next Sample Clock which indicates that

your program is not keeping up with the sample

clock.

To remove this error, slow down the sample clock,

or else change your application so that it can keep

up with the sample clock. Alternatively, consider

setting the Convert Errors to Warnings property to

true and then handling the warning case

appropriately.

can you help me?

thanks first

[Stuart_G]

I tried this out on my system and had no problems.  Keep in mind some things.  This function is completely computer dependent.  It will depend on how much Ram you have, how fast your processor is, and how much "other stuff" is going on in your computer.  It was designed for a Real-Time system, but will work on Windows.  I am going to assume you are running this on Windows.  So things you can do to help get the rate faster.

#1.  Don't have anything else running in Windows

#2.  Remove the indicator from inside the loop...that will slow it down.

#3.  You can set the thread of the VI to time critical.  Be warned though this will make other things in your system unresponsive.

#4.  Of course depending on loop rates and stability you could by a dedicated PXI RT controller.

As a comparison.  With absolutely no changes ot your example on my 3.2GHz with 1Gb of Ram and nothing else running I was able to only go 2.5kHz.  On an RT system our maximum sustainable rate is more like 40k

StuartG