EN 60477 : 1997 AMD 1 1997

FOREWORD
PREFACE
1 Scope
2 Definitions
  2.1 General terms
  2.2 Characteristic values
  2.3 Influence quantities, reference conditions,
      nominal range of use
  2.4 Errors and variations
  2.5 Accuracy, accuracy class, class index
3 Classification
4 Limits of intrinsic error
5 Conditions for the determination of intrinsic errors
6 Permissible variations
  6.1 Limits of variation
  6.2 Conditions for the determination of the variations
  6.3 Influence of self-heating (power dissipation)
  6.4 Influence of position
7 Further electrical and mechanical requirements
  7.1 Voltage tests and other safety requirements
  7.2 Insulation resistance
  7.3 Conditions of transport, storage and use
  7.4 Point of connection
  7.5 Provision of temperature measuring facilities
8 Markings and symbols
APPENDIX
A1 - Thermoelectric effects
A2 - Reference range and nominal range of use
A3 - Example of marking for a single resistor
A4 - Example of marking for a five-decade resistor

Applicable to resistors intended for use as laboratory d.c. resistors (hereinafter referred to as "resistors") comprising single or multiple resistors of accuracy Classes 0.0005 ...0.2 (5 ppM...2 000 ppM) and single or multi-decade resistors or accuracy Classes 0.0005...5(5 ppM...50 000 ppM). Recommendation does not apply to resistors used on alternating current or on pulsed currents, resistors which are intended for use solely as permanent mounted circuit components, series resistors and shunts which are considered as accessories of electrical measuring instruments in the relevant IEC publications.