How do I use the onboard clock when using DAQmx timing?

[Eyal_S.]

Hi,

I'm using the example: Count Digital Events-Buffered-Finite-Ext Clock.

I want to use the PCI-6602 onboard clock. When I leave the sample clock source unwired I get an error message :

                                                                                                                                                              Error -200303 occurred at DAQmx Start Task.vi:1 

                                                                                                                                                              Possible reason(s):

                                                                                                                                                              External sample clock source must be specified for this application.

Can someone tell me what I'm doing wrong?

[gus]

Counters do not have an internal onboard clock like the AI and AO subsystems do.  So you have to generate the sample clock for your edge counting task yourself.  This is often done with the other counter by generating a continuous pulse train.

I hope this helps!

gus....