Hello,
The 6602 counter board has the option to use a start trigger to start the counters operation. A start trigger setup utility can be found in ...LabVIEW 6\examples\daq\counter\ni-tio.llb at the bottom of the library it is called Counter Start Trigger.vi
To make sure that the readings of each counter are taken at the same time you would need to use a buffered operation and use the same gate signal to latch the data into the buffer on both counters at the same time. The start trigger will guarentee that the operations will start at the same time and the gating signal will latch the counters current count into the buffer at the same time. You could use buffered position measurement or buffered event counting for your application.
