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Reboot the unit and verify the new option is enabled.This Agreement is made between Massachusetts Institute of Technology with a principal address at 77 Massachusetts Avenue, Cambridge, MA 02139 (“MIT”) and the subscriber above ("LICENSEE"), and is effective at the date the downloading is completed and proper registration/licensee subscriber information submitted ("EFFECTIVE DATE").

Cycle power on the instrument to begin using the new features” will be seen.

After MST installs the license file the message “Instrument options successfully upgraded.Select the license file provided by the Service Center.Choose Sync → Device Status and Options → Set Options (License File).The local Service center will then return a license file, which can be loaded onto the unit using Master Software Tools.Save the file and email it to the local Service Center.Choose Sync → Device Status and Options → Get Options (Config File).Generate a config file using Master Software Tools, and email this file to the local Service Center.If the option can be retrofitted through software using a license file, below is the needed procedure: Some options include hardware that may require the unit to be returned to the factory for retrofitting, while other options can be retrofitted through software using a license file. Options can be added to the S331D by contacting your local Service Center. If it this cable looks good then the original coax cable is likely to be the cause of the problem. If the Site Master calibrates correctly and the phase stable cable looks good try testing a known good coax cable of the same type.A bad cable exhibit wild swing up and down as you move the cable around. You can also try moving the cable with the load on the end of it after calibration while watching the RL sweep. Even though you calibrate at the end of the phase stable cable when an RL of 20dB of less on a phase stable cable is not good. If you as seeing a 20 RL or less the phase stable cable might need replacing. The typical Return loss of a good phase stable cable should be 30dB. If the Return loss after the calibration is acceptable put the phase stable cable on the Site Master and put the termination at the end of the test port cable.With good components and a good Site Master 55-60 dB return loss is typical. The Return loss should be 42dB or better. Calibrate at the site master leaving the load on after the CAL ON is displayed.

If the test is still not passing do the following: Carefully clean all connectors and then re-test. Do a visual inspection of all connections on the site master, cal components and test port cable.