I.S. EN 60523:1993

Foreword
Preface
1 Scope
2 Terms and definitions
  2.1 D.C. potentiometer (hereinafter designated
       'potentiometer')
  2.2 Measuring dials
  2.3 Effective range
  2.4 Range-changing device
  2.5 Standardization of a potentiometer
  2.6 Dial setting
  2.7 Auxiliary equipment
  2.8 Resolution
  2.9 Circuit insulation voltage (nominal circuit voltage)
  2.10 Ripple content
  2.11 Leakage current screen (circuit)
  2.12 Electrostatic screen
  2.13 Measuring terminals
  2.14 Measuring circuit
  2.15 Measured quantity circuit selector switch
  2.16 Residual e.m.f. of a potentiometer
  2.17 Incremental linearity
  2.18 Influence quantity
  2.19 Common mode voltage
  2.20 Variation with influence quantity
  2.21 Reference conditions
  2.22 Reference value
  2.23 Reference range
  2.24 Nominal range of use
  2.25 Limiting values of an influence quantity
  2.26 Fiducial value
  2.27 Error
  2.28 Intrinsic error
  2.29 Accuracy
  2.30 Accuracy class
  2.31 Class index
3 Classification
4 Limits of intrinsic error
  4.1 Permissible limits of intrinsic error
  4.2 Incremental linearity
  4.3 Resolution
  4.4 Range-changing device
  4.5 Independent circuit for standardization of a
       potentiometer
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 Determination of the effect of a common mode voltage
7 Additional electrical and mechanical requirements
  7.1 Voltage test and other safety requirements
  7.2 Insulation resistance test
  7.3 Measured quantity circuit selector switches
  7.4 Rheostats for standardization of the potentiometer
  7.5 Limiting temperature for storage, transport and use
8 Information, markings and symbols
  8.1 Information
  8.2 Markings, symbols and their locations
  8.3 Documentation
  8.4 Example of the marking of a potentiometer
Appendix A - Determination of the effect of common mode
             voltage, Direct method
Appendix B - Determination of the effect of common mode
             voltage, Indirect method (Superposition method)

Applies to d.c. potentiometers assembled from resistors and switches and operating entirely on direct current, having accuracy classes of 0.0005 ... 0.1, as well as to auxiliary equipment which is built-in part of the potentiometer.