1.1 This standard applies to direct acting indicating electrical measuring instruments having an
analogue display, 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.
1.2 It also applies to certain accessories used with these instruments, such as:
— shunts;
— series resistors and impedance elements.
If other accessories are associated with instruments, this standard is applicable to the combina-tion of the instrument and the accessory provided that the adjustments have been made for the combination.
1.3 This standard also applies to a 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.
1.4 This standard also applies to instruments and accessories having electronic devices in their
measuring and/or auxiliary circuits.
1.5 This standard does not apply to special purpose instruments which are covered by their own IEC
standards.
1.6 This standard does not apply to special purpose devices which are covered by their own IEC
standards when they are used as accessories.
1.7 This standard does not contain either requirements for protection against environmental conditions
or the relevant tests. However, when necessary, and then only by agreement between the manu-facturer and the user, tests to approximate the conditions of use may be selected from IEC Pub-lication 68: Basic Environmental Testing Procedures, to prove protection against environmental conditions.
1.8 This standard does not specify requirements concerning dimensions of instruments or accessories
(for the former, see I EC Publication 473: Dimensions for Panel-mounted Indicating and Recording Electrical Measuring Instruments).
SIS SS IEC 107:1989 history
1989SIS SS IEC 107:1989 Electrical measuring instruments — Direct acting indicating analogue electrical measuring instruments and their accessories