10 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement 
System, & Agilent 8166A Lightwave Multichannel System, Fourth Edition
A sheet of laser safety labels is included with the laser module. You MUST stick 
the labels in the local language onto the outside of the instrument, in a position 
where they are clearly visible to anyone using the instrument.
Further Safety Information
WARNING Please pay attention to the following laser safety warnings:
• Under no circumstances look into the end of an optical cable attached to the 
optical output when the device is operational. The laser radiation can seriously 
damage your eyesight.
• Do not enable the laser when there is no fiber attached to the optical output 
connector.
• The laser is enabled by pressing the gray button close to the optical output 
connector on the front panel of the module. The laser is on when the green 
LED on the front panel of the instrument is lit.
• The use of optical instruments with this product will increase eye hazard. 
• The laser module has a built-in safety circuitry which will disable the optical 
output in the case of a fault condition.
WARNING Refer Servicing only to qualified and authorized personnel.
These laser safety warning labels are fixed on the outside of the Agilent 8164A 
Lightwave Measurement System before shipment.
Figure 4 Non-USA Safety Labels (81640A, 81680A, 81682A, 81689A)