ISO/IEC TECHNICAL REPORT TR 13841 First edition 1995-07-01 Information technology Guidance on measurement techniques for 90 mm optical disk cartridges TechnologiesdeI'information-- -Lignesdirectricespourlestechniques de mesurage des cartouches de disque optique de diametre 90 mm IEC Reference number ISO/IEC TR 13841:1995(E) ISO/IEC TR 13841:1995(E) Contents 1 1. General 1 1.1 Scope 1 1.2 Purpose 1 1.3 Reference 1 1.4 Definitions 1 2 Measurement environments 1 2.1 General 1 2.2 Measurement environment A 1 2.3 Measurement environments B 1 2.4 Measurement environment C 2 3 Measurement set up 2 3.1 General 22 3.2 Measurement accuracy 3.3 Calibration disk 2 3.4 Measurement area 2 3.5 Reference Servo 3 4 Items for measurement techniques 3 4.1 General 3 4.2 List of measurement items 3 5 Measurement techniques 3 5.1 Shutter opening force 3 5.1.1 Definition 4 5.1.2 Measurement procedure 4 5.2 Clamping force 4 5.2.1 Introduction 4 5.2.2 Measurement procedure 4 5.3 Tilt 4 5.3.1 Introduction 5 5.3.2 Measurement method 1 5 5.3.3 Measurement method 2 7 5.4 Axial and Radial acceleration 7 5.4.1 Introduction 7 5.4.2 Measurement system 7 5.4.3 Procedure 1: Low-pass measurement system 8 5.4.4 Procedure 2: High-pass Measurement System 9 5.4.5 Procedure 3: Total measurement system 14 5.5 Reflectance ISO/IEC 1995 reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii @ ISO ISO/IEC TR 13841:1995(E) 15 5.6 Capture cylinder 5.7 Signals from grooves 15 15 5.7.1 Measurement equipment 15 5.7.2 Measurement conditions 5.7.3 Measuring procedure 15 16 5.8 Signals from headers 16 5.8.1 General 5.8.2 Amplitude measurement 16 21 5.9 Read power 21 5.9.1 Definition 21 5.9.2 Measurement conditions 21 5.9.3 Measuring procedure 21 5.9.4 Analysis 22 5.10 Write power and erase power 22 5.10.1 Definition 22 5.10.2 Measurement conditions 22 5.10.3 Measuring procedure 22 5.10.4Analysis 25 5.11 Imbalance of the magneto-optical signal 25 5.11.1 Measurement condition 25 5.11.2 Measuring procedure 25 5.12 Narrow-Band Signal-to-Noise Ratio (NBSNR) 25 5.12.1 Definition 25 5.12.2 Measurement conditions 25 5.12.3 Measuring procedure Annexes 27 A - The flow chart for determining write power and erase power B - Averaging Times and Spectrum Analyzer Data 29 31 C - Measurement Frequency Point for Noise Level D - Notes on Measuring Noise Level 36 E - Example of measurement procedure of signals from grooves 38 F . The Measuring Method of The Capture Cylinder Radius for the Hub 41 50 G - Better noise measurement with the HP3585A & HP3589A H - An example of measurement equipment and data for shutter opening force 70 ili