BS 5457(1977) : 1977 AMD 10233

Foreword
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. Marking 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

Covers resistors intended for use as laboratory d.c. resistors comprising single or multiple resistors of accuracy Classes 0.0005...0.2 (5ppM...2000ppM) and single or multi-decade resistors of accuracy Classes 0.0005...5 (5ppM...50 000ppM). Excludes resistors used solely as permanent mounted circuit components; resistors used on alternating current or on pulsed currents; and series resistors and shunts which are treated as accessories of electrical measuring instruments in I E C publications. Includes sections on classification, limits and conditions for the determination of intrinsic errors. Permissible variations, additional electrical and mechanical requirements, and markings and symbols. AMD 10233 RENUMBERS STD