calibrating Agilent N5183 Signal generator for specific output level

Hi,

Newbie to labview enviornment!  I am trying to write a VI to calibrate Agilent N5183 to a specific output.  For e.g. if I want to have -4.5 dBm output from my setup (as displayed on my power meter) I will have to set the sig gen to say 7dBm taking into account my losses etc.

Any pointers how do I start tacking this?  I think I will have to create a while loop to check power levels, however I do not know how to increment and decrement the sig gen amplitude and stop at the desired level!

Thanks in advance for any help.

PS: Using Labview 2013, on win XP machine!