The steps are to connect the reference light source to the power meter using a clean and compatible connector, turn on the power meter and select the appropriate wavelength and unit settings, turn on the reference light source and wait for it to stabilize, read the displayed. The steps are to connect the reference light source to the power meter using a clean and compatible connector, turn on the power meter and select the appropriate wavelength and unit settings, turn on the reference light source and wait for it to stabilize, read the displayed. Tektronix state-of-the-art calibration laboratory offers a comprehensive range of services for fiber optic test and measurement equipment. Whether you're dealing with laser sources, LED sources, optical power sensors, or optical spectrum analyzers, we've got you covered. Experts who add quality contributions will have a chance to be featured. From manufacturing floors to research labs, our optical calibration services guarantee that your instruments, whether for fiber optics, photometry, or dimensional inspection, deliver. NT-OLS-3007 Handheld Optical Light Source is a newly designed fiber optic tester, it aims at fiber network installation, fiber network engineering acceptance and fiber network maintenance. Combined usage with NT-OPM-2007 optical power meter, it offers a quick and accurate testing solution on both SM. An Optical Light Source (OLS) is an essential handheld device used by network technicians to test fiber optic systems.