Thank you for purchasing the DL9040/DL9140/DL9240 Series Digital Oscilloscope (DL9040/DL9040L/DL9140/DL9140L/DL9240/DL9240L, hereafter referred to as the DL9000). This user’s manual contains useful information about the functions, operating procedures, and handling precautions of the DL9000.

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T o ensure correct use, please read this manual thoroughly before beginning operation. After reading the manual, keep it in a convenient location for quick reference whenever a question arises during operation. The following two manuals, including this one, are provided as manuals for the DL9000. Read them along with this manual. DL9040/DL9140/DL9240 Series Digital Oscilloscop e User’s Manual IM 70131 0-01E This ma nual. Ex plain s all funct ions and procedures of the DL9040/ DL9140/DL9240 Series excluding the communication functions.

DL9040/DL9140/DL9240 Series Digital Oscilloscop e Communication Interface User’s Manual (in CD) IM 70131 0-17E Expl ains the com munic ation in terfac e functions of the DL9040/DL9140/DL9240 Series. DL9000 Series Digital Oscilloscop e Serial Bus Signal Analysis Function User’s Manual IM 70131 0-51E Expl ains th e operati ng proce dures of th e optional I.

If the most recent firmware version is not running on your DL9000, not all of the features described in this manual can be used. Y ou can check the firmware version of your DL9000 on the overview screen. For instructions on how to open the overview screen, see section 18.4 in this manual.

T o upgrade to the latest firmware version, go to the following Web page, and then browse to the download page. The contents of this manual are subject to change without prior notice as a result of continuing improvements to the instrument’s performance and functions. The figures given in this manual may differ from the actual screen.

Every effort has been made in the prepara tion of this manual to ensure the accuracy of its contents. However, should you have any questions or find any errors, please contact your nearest YOKOGAWA dealer. Copying or reproducing all or any part of the contents of this manual without the permission of Yokogawa Electric Corporation is strictly prohibited. Microsoft, Internet Explor er, MS-DOS, Windows, Windows NT, WIndows 2000, Windows Me, and Windows XP are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Adobe, Acrobat, and PostScript are trademarks of Adobe Systems Incor porated.

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For purposes of this manual, the TM and ® symbols do not accompany their respective trademark names or registered trademark names. Other company and product names are trademarks or registered trademarks of their respective companies.