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Direct acting indicating analogue electrical measuring instruments and their accessories -- Definitions and general requirements common to all parts
This part of IEC 60051 specifies _definitions_ and **general requirements** for direct acting indicating analogue electrical measuring instruments and their accessories.
This part applies to direct acting indicating analogue electrical measuring instruments, such as:
ammeters and voltmeters;
wattmeters and varmeters;
frequency meters of pointer and vibrating-reed types;
phasemeters, power-factor meters and synchroscopes;
ohmmeters (impedance meters) and conductance meters;
multi-function instruments of the above types.
It also applies to:
certain accessories used with these instruments, such as:
shunts;
series resistors and impedance elements;
combination of the instruments and the accessories provided that the adjustments have been made for the combination;
direct acting indicating electrical measuring instrument whose scale marks do not correspond directly to its electrical input quantity, provided that the relationship between them is known;
instruments and accessories having electronic devices in their measuring and/or auxiliary circuits.
These series standards do **not** apply to:
special purpose instruments which are covered by their own IEC standards;
special purpose devices which are covered by their own IEC standards when they are used as accessories.
This standard does not specify requirements concerning **dimensions of instruments or accessories** (for the former, see IEC 60473 ).
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