FOREWORD
PREFACE
Clause
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
6.4 Variation due to the influence of a magnetic field
of external origin
7 Additional electrical and mechanical requirements
7.1 Voltage test and other safety requirements
7.2 Functional insulation test
7.3 Measured quantity circuit selector switches
7.4 Potentiometer adjustments
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
Appendices
A - Determination of the effect of common mode
voltage. Direct method
B - Determination of the effect of common mode
voltage. Indirect method (Superposition method)