Counter0 possible freq

[barak]

Hi,

I'm using 6133 card, Labview 8.2 and daqmx 8.3

I use the example for using counter0 as pulse train retriger to sample continusly signal.

The problem is that not for all scan rates i use i get a correct respond.

I read in the documantation that the freq of the timer is 100Khz or 20Mhz,What thats meen?

Can i use ant scan rate as i want (10Khz,20Khz,30Khz......).for 10Khz i get good result( the accurate number of samples i want) but for 30Khz for example i get strange results.

I assume that there is some kind of divider in the card that divide the base freq(100Khz/20Mhz), but i didn't found anything

in the documentation.

please help!

[RavensFan]

Duplicate Post. of message already in other thread.

[ryan_d]

Hi barak,

You are correct that the timebase is divided down by an integer value. There are a couple property nodes that you can use to see exactly what frequency you’re sampling at and also the timebase divisor that’s being used to achieve that frequency. They can be found by placing a DAQmx Timing Property Node (Measurement I/O » NI-DAQmx » Timing Node) on the block diagram and selecting Sample Clock » Rate and Sample Clock » Timebase Divisor.

There are two listed timebases because of the timebase division that occurs. The slower timebase is there to give you a greater timebase resolution for lower frequencies with a smaller divisor.

Please post back if you have any questions. Happy New Year!