The ERM-202 combines low noise circuitry with a high resolution stepper motor to achieve a PER dynamic range of 50 dB and angle resolution of 0. It simultaneously measures PER, output power, and axis angle of the DUT. These easy-to-use benchtop devices are useful in alignment applications such as connectorization of PM fibers or pigtailing of laser diodes with PM. The ERM-202 is a rotating-polarizer polarization extinction ratio meter. It is available in single or dual channel versions. It simultaneously. The ERM-202 is a dual channel polarization extinction ratio (PER) meter specifically designed to simultaneously measure the PER and power ratio of a device with two polarization maintaining (PM) outputs, such as a Y-branch fiber gyro IOC, PM coupler (PMC), or polarization beam splitter (PBS), as. Full band 1260-1630nm Simultaneous display of extinction ratio, optical power, and polarization angle 50 dB dynamic range for PER measurement Wide dynamic input power range (-40 to +10 dBm/Normal power), (-25 to +20dBm/High power) Direct PD analog output Real-time (up to 10Hz) measurement. The PERM-800 optical power meter is an innovative solution that directly measures our output polarization extinction ratio from a fiber. It features unmatched low cost, all wavelength options, a large dynamic range, and high resolution. When used with a broadband source, it directly measures PER.