multiple channel thermocouple measurement

[desduen]

hai guys

i am new at labview and daq device. i am using NI-USB 6251 to measure temperature using 2 thermocouple, connected to 2 analog input pin of NI-USB 6251. i got problem that when i start my VI, the 2 pins can't doing measurement at the same time. it works well if i just activate 1pin, but got problem when read 2 thermocouple at the same time. thanks for your help guys

here my VI

[Hatef.fouladi]

the method that you select for multi channel is not true you can not open daq vi for same daq separately

and in three different loops also you have to use differential mode for this sensor 
use daq assistant for two channel if you do not want to make complex code
if you want to do it , there is mutli channel example for daqmx in labview see them