4 Keysight N1911A and N1912A Installation GuideCooling, Cleaning, and Usage RequirementsCooling requirementsTo provide adequate cooling, and air gap of approximately 75mm (3ins) should bemaintained around the vented sections of the instrument.CleaningUse a soft, clean, damp cloth to clean the front-panel and side covers.UseThis instrument is designed for indoor use only.WARNING Appliance coupler (mains input power cord) is the power disconnect device.Do not position the instrument such that access to the coupler is impaired.WARNING For continued protection against fire hazard, replace the line fuse only withthe same type and line rating (250V, F3.15A, 20mm fast blow fuse with highbreaking capacity, Keysight part number 2110-0957). The use of other fusesor materials is prohibited.WARNING No operator serviceable parts inside. Refer servicing to qualified personnel.To prevent electrical shock do not remove covers.WARNING If this instrument is not used as specified, the protection provided by theequipment could be impaired. This instrument must be used in a normalcondition only (in which all means for protection are intact).