6 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement 
System, & Agilent 8166A Lightwave Multichannel System, Fourth Edition
• Do not install substitute parts or perform any unauthorized modification to the 
instrument.
• Be aware that capacitors inside the instrument may still be charged even if the 
instrument has been disconnected from its source of supply. 
• You MUST return instruments with malfunctioning laser boxes to an Agilent 
Technologies Sales/Service Center for repair and calibration.
Safety Symbols
The apparatus will be marked with this symbol when it is necessary for the user to 
refer to the instruction manual in order to protect the apparatus against damage.
Caution, risk of electric shock.
Frame or chassis terminal.
Protective conductor terminal.
Hazardous laser radiation. 
Magnetic fields may interfere with a pacemaker. 
WARNING The WARNING sign denotes a hazard. It calls attention to a procedure, practice 
or the like, which, if not correctly performed or adhered to, could result in injury 
or loss of life. Do not proceed beyond a WARNING sign until the indicated 
conditions are fully understood and met.
CAUTION The CAUTION sign denotes a hazard. It calls attention to an operating procedure, 
practice or the like, which, if not correctly performed or adhered to, could result 
in damage to or destruction of part or all of the equipment. Do not proceed 
beyond a CAUTION sign until the indicated conditions are fully understood and 
met.