Safety precautionsThe following safety precautions should be observed before using this product and any associated instrumentation. Althoughsome instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardousconditions may be present.This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautionsrequired to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before usingthe product. Refer to the user documentation for complete product specifications.If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.The types of product users are:Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that theequipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of theinstrument. They must be protected from electric shock and contact with hazardous live circuits.Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the linevoltage or replacing consumable materials. Maintenance procedures are described in the user documentation. The proceduresexplicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trainedservice personnel may perform installation and service procedures.Keithley Instruments products are designed for use with electrical signals that are measurement, control, and data I/Oconnections, with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with hightransient overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transientovervoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected tomains. These instruments will be marked as category II or higher.Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or testfixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than30 V RMS, 42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in anyunknown circuit before measuring.Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operatorsare prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potentialhuman contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. Ifthe circuit is capable of operating at or above 1000 V, no conductive part of the circuit may be exposed.Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance-limitedsources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protectivedevices to limit fault current and voltage to the card.Before operating an instrument, ensure that the line cord is connected to a properly-grounded power receptacle. Inspect theconnecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main inputpower disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit undertest. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnectingcables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth)ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding thevoltage being measured.
