4 Keysight 34921A-34925A User’s GuideAdditional Safety NoticesThe following general safety precautions must be observed during all phases ofoperation of this instrument. Failure to comply with these precautions or withspecific warnings or instructions elsewhere in this manual violates safetystandards of design, manufacture, and intended use of the instrument. KeysightTechnologies assumes no liability of the customer’s failure to comply with therequirements.GeneralDo not use this products in any manner not specified by the manufacturer. Theprotective features of this product may be impaired if it is used in a manner notspecified in the operation instructions.Before Applying PowerVerify that all safety precautions are taken. Make all connections to the unit beforeapplying power.Ground the InstrumentThis product is provided with protective earth terminals. To minimize shockhazard, the instrument must be connected to the ac power mains through agrounded power cable, with the ground wire firmly connected to an electricalground (safety ground) at the power outlet. Any interruption of the protective(grounding) conductor or disconnection of the protective earth terminal will causea potential shock hazard that could result in personal injury.Do Not Operate in an Explosive AtmosphereDo not operate the instrument in the presence of flammable gases or fumes.