BS CECC 41400:1980

Foreword
Preface
Section 1 - Scope
Section 2 - Preferred characteristics, ratings and
            severities for environmental tests
2.1 Characteristics
2.1.1 Climatic severities
2.1.2 Temperature characteristics and temperature
        coefficients of resistance
2.1.3 Limits for change in resistance, or output ratio
2.1.4 Limits for insulation resistance
2.1.5 Limits for resistance law
2.2 Ratings
2.2.1 Rated resistance
2.2.2 Tolerances on rated resistance
2.2.3 Rated dissipation
2.2.4 Limiting element voltage
2.2.5 Isolation voltage
2.2.6 Degree of conformity
2.2.7 Number of turns of the actuating device
2.2.8 Number of cycles of operation
2.2.9 Spindle rotational speed
2.3 Severities for environmental tests
2.3.1 Drying
2.3.2 Vibration
2.3.3 Bump
2.3.4 Shock
2.3.5 Low air pressure
2.3.6 Change of temperature
2.3.7 Soldering
2.4 Derating curve
2.5 Information to be given in a detail
        specification
2.5.1 Style
2.5.2 Rated dissipation
2.5.3 Limiting element voltage
2.5.4 Isolation voltage
2.5.5 Resistance law and degree of conformity
2.5.6 Dimensions
2.5.7 Resistance range
2.5.8 Tolerances on rated resistance
2.5.9 Temperature characteristics of resistance
2.5.10 Climatic category
2.5.11 Vibration severity
2.5.12 Bump severity
2.5.13 Shock severity
2.5.14 Low air pressure severity
2.5.15 Soldering
2.5.16 Limits of resistance change after 1 000 h,
2.5.17 Starting torque
2.5.18 Resolution
2.5.19 Number of turns of the actuating device
2.5.20 Limiting slider current
2.5.21 Terminal resistance and, where applicable,
        residual resistance and minimum effective
        resistance
2.5.22 Derating curve
2.5.23 Mechanical endurance
2.5.24 Marking
2.5.25 Ordering information
2.5.25 Additional information
Section 3 - Inspection
3.1 Formation of inspection lots
3.2 Delayed delivery
3.3 Test methods
3.4 Apparatus for measuring mechanical accuracy
3.4.1 Dial indicator
3.4.2 Cylindrical spindle adapter
3.4.3 Potentiometer mounting fixture
3.4.4 Potentiometer spindle holding fixture
3.5 Qualification approval

Prescribes the preferred values for characteristics and ratings and also the inspection requirements for rotary precision potentiometers of assessed quality.