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Model 220 Programmable Current Source Instruction Manual- 01982, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Eighth Printing, August 2000 Document Number: 220-901-01 Rev. H Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revision Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released between Revisions, contain important change information that the user should incorporate immediately into the manual. Addenda are numbered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual. Each new Revi- sion includes B revised copy of this print history page. Revision G (Document Number 220-901-01) ... 1992 Revision H (Document Number 220-901-01) ... August2000 Safety Precautions The following safety precautions should be observed before using Users of this product must be protected from electric shock at all this product and any associated instrumentation. Although some times. The responsible body must ensure that users are prevented instruments and accessories would normally be used with non- access and/or insulated from every connection point. In some cases, hazardous voltages, there are situations where hazardous conditions connections must be exposed to potential human contact. Product may be present. users in these circumstances must be trained to protect themselves from the risk of electric shock. If the circuit is capable of operating This product is intended for use by qualified personnel who mcog- at or above 1000 volts, no conductive part of the circuit may be nize shock hazards and are familiar with the safety precautions m- exposed. quired to avoid possible injury. Read the operating information carefully before using the product. As described in the lntemational Electrotechnical Commission (IEC) Standard IEC 664, digital multimeter measuring circuits The types of product users are: (e.g., Keithley Models l75A, 199,2000,2001, 2002, and 2010) arc Responsible body is the individual or group responsible for the use Installation Category II. All other instruments signal ter