How to take voltage measurements every minute

Hi all,

I am currently new to labview and i am trying to take timed voltage measurements.  Here is what i am trying to do;

 I am using labview 2010 and I am trying to take temperature and humidity readings in sync with each other.  To measure the temperature i am using a cDaq and mudule 9213, for humiduty i am using the voltage from module 9234 and converting it using the ambient temperature and voltage from my humidity sensor.  

Now what i want to do is take voltage and temperature measurements say every minute or 30 seconds, but my buffer fills from the voltage readings and gives me an error or the table takes values from what im assuming is the buffer, one by one, instead of grabbing the current data from the module.  

My real question here is how do i take current voltage measurements every 30 seconds?

Thank you for any advice.