8163A/B, 8164A/B, 8166A/B User’s Guide 379Error Messages 14error message Out of specificationdescription The unit has been found outside the specification.This may happen due to various reasons.affected modules TLSaction Please run LambdaZero from the menu first. If the failure persists, reboot the mainframe and run realignfrom the menu. If this does not help, please return the unit to your local service center for repair.error message Duty cycle out of rangedescription The power control loop cannot control the correct output power anymore, because the duty cycle of theexternal modulation is too small.affected modules TLSaction Increase the duty cycle (that is, increase the on-state duration of the modulated signal)error message Beampath safety errordescription A problem on the module has lead to an unsafe operation state. For this reason, the shutter has beenclosed.affected modules All attenuatorsaction If this problem occurs several times, please send the module to the local Keysight service center for repair.error message Module communication errordescription There was an error in communication between module and mainframe. For safety reasons, the module wasdisabled and the shutter closed.affected modules All attenuatorsaction If this problem occurs several times, please send the module to the local Keysight service center for repair.
