Other topics about Setting Control Functions
The software options can be purchased separately to enhance the E5061B measurement functionality. When you purchase the software option upgrade kit, Keysight provides the software entitlement certificate.
Get the license number at http://www.keysight.com/find/softwarelicense.
Press System > Service Menu > Enable Options and then select option which you want to activate.
Type the relevant 12 character long license key sent by Keysight in the Key Code entry dialog box, then click Enter.
Check the installed option according to Checking the product information.
The license keys are kept in a text file (.lic) located at RECOVERY(E):\LICENSE\gen.lic. Even if you lost the file, you can activate the option again if you have the license number. You can re-create the license number at http://www.keysight.com/find/softwarelicense with your software entitlement certificate.