Avoid burning the power sensor by having some idea of the signal level to be measured with the sensor. Properly apply a DC block, limiter or external attenuator. The DINTEK Handheld Optical Power Meter is a newly designed fiber optic tester, aimed at the installation of fiber, engineering acceptance maintenance of fiber networks. It is a basic measuring instrument in optical fiber communication system. Knowing the proper usage and precautions for power sensors and meters would spare you inconvenience, and downtime required for repair. REF/dB key: Short press the dB to switch unit, click once nW/dBm/dB to enter the upper clear data, press and hold until REF is displayed on the screen, and set the current optical power as reference value, enter the relative. Optical power meter is an instrument used to measure optical power. What you need to know about optical. Fiber Optical Powermeter User Manual | FS Title Author Subject Keywords Created Date.