Modes: 6 modes available, not all need be used; Rate, Integrate, CPM or CPS, Scaler, and 2 user defined to any mode with separate calibration. Calibration, Setup, and Maintenance mode also available. Time base:. This Applications Engineering Note (AEN 135) explains and recommends standard measurement methods for characterizing optical fiber system performance. This note also provides background information on system link configurations, test equipment and system component considerations that influence. important part of the 350 System. Where appropriate, this Manual includes important safety information. Safety infor-mation appears as WARNING and CAUTION instructions. WARNING. Optical power, required for measuring source power, receiver power and, when used with a test source, loss or attenuation, is the most important parameter and is required for almost every fiber optic test. Backscatter and wavelength measurements are the next most important and bandwidth or. The Optical Multimeter (OMM) is one such essential tool, serving as a versatile instrument for measuring various parameters within optical fiber networks. No part of this book may be reproduced or utilized in any form or means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without pe n optical fiber to a distant receiver. Gasketed splashproof aluminum enclosure.