LM35 & USB-6008 Problem

[volgi]

Hi

[volgi]

Dear,

i´m a student and i´m newbi in Labview and DAQ. I want to report the temperature of my computer. I read the book of Prentice /Hall and i bought me the USB 6008. Then i pluged the cables of the LM35 into the 6008 (pin 2, 31,32). When i start the .vi the numerical shows me numbers around -1,11. What is this and what should i do if i want celsius? Did i something wrong?

Thanks for all your help.

I attached the vi

[Andre_Saller]

First, you have to configure the DAQ-Assistant to use "Referenced Single Ended" mode (Found in the configuration-tab of the express block, where you configured "differential").

Second, the value you see is the Voltage acquired at the analo ginput, so to get a °C value, you have to scale the Voltage value according to the datasheet of your sensor. You can either do this in the DAQ-Assistan as well by adding a custom scale (again in the configuration-tab of the DAQ Assistant) or by using mathematical operations in your VI to calculate the temperature.