MT 23 - TC 85/MT 23

IEC 60051-9:2019 applies to direct acting indicating analogue electrical measuring instruments and their accessories and gives guidance for applicable test methods and for the performance of test equipment.
This document does not apply to:
– special purpose instruments that are covered by their own IEC International Standards;
– special purpose devices that are covered by their own IEC International Standards when they are used as accessories.
IEC 60051-9:2018 cancels and replaces the fourth edition published in 1988, Amendment 1:1994 and Amendment 2:1995. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) adding performance requirements for test equipment;
b) updating the references to the applicable standards for test methods.

IEC 60051-2:2018 applies to direct acting indicating ammeters and voltmeters having an analogue display.
It also applies to:
• direct acting indicating ammeters and voltmeters whose scale marks do not correspond directly to their electrical input quantity, provided that the relationship between them is known;
• direct acting indicating ammeters and voltmeters and accessories having electronic devices in their measuring and/or auxiliary circuits.
This document does 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.
IEC 60051-2:2018 cancels and replaces the fourth edition published in 1984. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test item.
This International Standard is to be used in conjunction with IEC 60051-1:2016.

IEC 60051-3:2018 applies to direct acting indicating wattmeters and varmeters having an analogue display.
IEC 60051-3:2018 also applies to:
• non-interchangeable accessories (as defined in 3.1.23 of IEC 60051-1:2016) used with wattmeters and varmeters;
• a combination of the instruments and the accessories provided that the adjustments have been made for the combination;
• direct acting indicating electrical measuring instruments whose scale marks do not correspond directly to their electrical input quantity, provided that the relationship between them is known;
• instruments and accessories having electronic devices in their measuring and/or auxiliary circuits.
IEC 60051-3:2018 does 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.
IEC 60051-3:2018 cancels and replaces the fourth edition published in 1984 and Amendment 1:1994. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.
IEC 60051-3:2018 is to be used in conjunction with IEC 60051-1:2016.

IEC 60051-4:2018 applies to direct acting indicating analogue frequency meters of the following types:
• pointer-type frequency meters (as defined in 3.2.11 of IEC 60051-1:2016);
• vibrating-reed frequency meters (as defined in 3.2.12 of IEC 60051-1:2016).
IEC 60051-4:2018 also applies to non-interchangeable accessories (as defined in 3.1.23 of IEC 60051-1:2016) used with frequency meters.
IEC 60051-4:2018 cancels and replaces the fourth edition published in 1984. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.
IEC 60051-4:2018 is to be used in conjunction with IEC 60051-1:2016.

IEC 60051-7:2017 applies to multi-function analogue instruments.
This document also applies to non-interchangeable accessories (as defined in 3.1.23 of IEC 60051-1:2016) used with multi-function analogue instruments.
This fifth edition cancels and replaces the fourth edition published in 1984. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.

IEC 60051-5:2017 applies to direct acting indicating phase meters, power factor meters and synchroscopes having an analogue display.
This document also applies to non-interchangeable accessories (as defined in 3.1.23 of IEC 60051-1:2016) used with phase meters, power factor meters and synchroscopes.
This document also applies to a phase meter or power factor meter whose scale marks do not correspond directly to its electrical input quantity, provided that the relationship between them is known.
This fifth edition cancels and replaces the fourth edition published in 1985. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.

IEC 60051-8:2017 applies to accessories as defined in 3.1.20 of IEC 60051-1:2016.
This fifth edition cancels and replaces the fourth edition published in 1984. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.

IEC 60051-6:2017 applies to direct acting indicating analogue electrical measuring ohmmeters (impedance meters) and conductance meters.
This document also applies to some non-interchangeable accessories of ohmmeters (impedance meters) and conductance meters.
This fifth edition cancels and replaces the fourth edition published in 1984. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.

IEC 60051-1:2016 specifies definitions and general requirements for direct acting indicating analogue electrical measuring instruments and their accessories. This sixth edition cancels and replaces the fifth edition published in 1997. This edition constitutes a technical revision.