Check Display: The optical power meter will display the power level, typically in dBm or mW. Some meters allow data logging directly to a computer or internal memory. EXFO can help save both time and costs with an automated calibration test system that is designed for the verification of power meters, attenuators, sources and optical time-domain reflectometers (OTDRs). Other general purpose light power measuring devices are usually called radiometers, photometers, laser power. In this video, we explain how to repair an Optical Power Meter that powers ON but does NOT show any optical power reading. The figures given in this manual ion of this manual to ensure the accuracy of its contents. However, should you have any questions or fi gistered users with a variety of information and services. 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. on issues in optical networks. If you are looking for a low cost device capable of saving and reporting take a look at the RP460 or RP560 if f detected on the main screen.