Keysight Technologies 8163A/B Programming Manual page 172

4 Measurement Operations & Settings
response: The highest permissible power for the selected wavelength sweep as a float value.
example: wav:swe:pmax? 1540nm,1550nm -> +3.5500000E-004<END>
affects: All tunable laser modules, and except 81950A.
172 8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide