Request InfoYokogawa Europe BVFour models have been added to Yokogawa Test & Measurement’s AQ1200 series handheld optical time-domain reflectometers (OTDRs) for FTTx applications. The triple-wavelength AQ1200E operates at the standard in-service wavelengths of 1310 and 1550 nm for testing network quality at the installation stage. For maintenance test purposes and to prevent interference with in-service signals on active networks, a third wavelength of 1625 nm is used with a cut-off filter. 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