Nahid,
If you are completely new to LabVIEW, start by going through the on-line tutorials for Getting Started with LabVIEW.
Next download the drivers for your instrument. Check first. It may already be included. The driver includes 4-wire resistance meausrements.
Designing the program before writing it is an excellent plan - one which many people neglect. You have a nice description of what you want the program to do. Specify the details clearly: Does the hourly data collection occur on the hour (10:00 for example) or one hour after the program starts? (Start at 10:17; collect next data at 11:17). Are you going to collect only one measurement each hour or will you take several measurements at close intervals and average the result to reduce noise? Specify the file format including any headers. Specify how the file will be named (by the operator or through some automatic naming method). Specify how the program will stop: after a time limit, after a number of measurements, when the user pushes a button? How will errors be handled? What should the system do if the power fails while the experiment is running and then comes back on? What else will the computer be doing between measurements? Any other relevant items.
After you have a complete specification, you can select a program architecture. Often measurement systems are well suited to the Producer/Consumer architecture, but because of the long times between measurements you may be abel to use something simpler. Also look at state machines.
Define tasks which are separable from other parts of the program and create subVIs for those tasks. Look at the 34401 drivers for examples. Configuration and reading are in separate subVIs. Similarly creating the file and writing the file header may be handled separately from writing measurement data to the file.
... and many more details.
Get started. As you have specific questions, post them here or in the LV Board.
Lynn
