Keysight Technologies 8163A User Manual page 169

5 Tunable Lasers
168
Figure 95
If the TLS recommends Realign (after boot or during a manual lambda
NOTE
zero), then "UNCAL" is shown on the user interface in both Autocal
modes. No Accuracy class is shown in the Autocal Off mode.
The bit 6 "ARA recommended" is set in the "questionable condition
register" (See the 8163A/B Lightwave Multimeter, 8164A/B Lightwave
Measurement System, 8166A/B Lightwave Multichannel System
Programming Guide)
Please execute Realign in this case.
Realign Screen
8163A/B, 8164A/B, 8166A/B User's Guide