LabView Slow Data Acquisition

[patufet_99]

Hello,

What is the best way to do a slow (less than an acquisition per second)

but accurate (on time) acquisition for data logging?

I have tried to do it with a timed loop in order to be able to fast stop

the loop when required (see LabView 8.5 attached example).

This approach works or not depending on the hardware. I tested 3 different DAQ cards with different results. For the two ones that worked, I had to select a different "Sample Clock" sampling mode:

DacqCard 6036E: "Hardware Timed single Point" sampling mode

USB-6016: "Continuous Sample" sampling mode

USB-6009: Did not work

By using a simulated device, this approach dit not seem to work neither.

How could this be done in such a way to be independent on the hardware? Would there be other ways to do it without timed loops?

Thank you for your suggestions.

[rpursley]

Try the attached example. It uses the event structure to trigger the reads and also allows instant stopping of loop.

QUOTE(patufet_99 @ Feb 15 2008, 08:32 AM)

Hello,

What is the best way to do a slow (less than an acquisition per second)

but accurate (on time) acquisition for data logging?

I have tried to do it with a timed loop in order to be able to fast stop

the loop when required (see LabView 8.5 attached example).

This approach works or not depending on the hardware. I tested 3 different DAQ cards with different results. For the two ones that worked, I had to select a different "Sample Clock" sampling mode:

DacqCard 6036E: "Hardware Timed single Point" sampling mode

USB-6016: "Continuous Sample" sampling mode

USB-6009: Did not work

By using a simulated device, this approach dit not seem to work neither.

How could this be done in such a way to be independent on the hardware? Would there be other ways to do it without timed loops?

Thank you for your suggestions.

[patufet_99]

Hello,

Thank you so much for your alternative! It works great!

Regards.