Technical data
iv N1911A/1912A P-Series Power Meters Service Guide
Equipment Operation
Warnings and Cautions
This guide uses warnings and cautions to denote hazards.
Personal Safety Considerations
This is a Safety Class I product (provided with a protective earthing ground 
incorporated in the power cord). The mains plug shall only be inserted in a 
socket outlet provided with a protective earth contact. Any interruption of 
the protective conductor, inside or outside the instrument, is likely to make 
the instrument dangerous. Intentional interruption is prohibited. If this 
instrument is not used as specified, the protection provided by the 
equipment could be impaired. This instrument must be used in a normal 
condition (in which all means of protection are intact) only. 
No operator serviceable parts inside. Refer servicing to qualified 
personnel. To prevent electrical shock, do not remove covers. For 
continued protection against fire hazard, replace the line fuse(s) only with 
fuses of the same type and rating (for example, normal blow, time delay, 
etc.). The use of other fuses or material is prohibited.
WARNING
A WARNING notice denotes a hazard. It calls attention to an operating 
procedure, practice, or the like that, if not correctly performed or 
adhered to, could result in personal injury or loss of life. Do not proceed 
beyond a WARNING notice until the indicated conditions are fully 
understood and met.
CAUTION
A CAUTION notice denotes a hazard. It calls attention to an operating 
procedure, practice, or the like that, if not correctly performed or adhered 
to, could result in damage to the product or loss of important data. Do not 
proceed beyond a CAUTION notice until the indicated conditions are fully 
understood and met.










