Keysight Technologies 8163A User Manual page 173

5 Tunable Lasers
172
When Auto Cal is on, during sweeps, there is no interruption to the
NOTE
measurement due to settling. Also no settling will occur during
operation at a fixed wavelength when at least one output is switched on.
By periodically checking the "questionable condition register" bit 10 you
can detect when Lambda Zero is recommended.
8163A/B, 8164A/B, 8166A/B User's Guide