1 Scope
2 Preferred characteristics, ratings and severities for
environmental and overload 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
2.2 Preferred value 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 Insulation resistance
2.2.6 Insulation voltage
2.3 Severities for environmental and overload test
2.3.1 Drying
2.3.2 Vibration
2.3.3 Low air pressure
2.3.4 Bump
2.3.5 Shock
2.3.6 Overload
2.4 Information to be given in detail specification
2.4.1 Style
2.4.2 Rated dissipation
2.4.3 Limiting element voltage
2.4.4 Dimensions
2.4.5 Resistance range
2.4.6 Tolerances on rated resistance
2.4.7 Climatic category
2.4.8 Vibration severity
2.4.9 Low air pressure severity
2.4.10 Bump severity
2.4.11 Shock severity
2.4.12 Limits of resistance change after 1000 h
endurance test
2.4.13 Temperature characteristic of resistance
2.4.14 Overload
2.4.15 Derating curve
2.4.16 Marking
2.4.17 Ordering information
2.4.18 Additional information (not for
inspection purposes)
3 Inspection
3.1 Formation of inspection lots
3.1.1 General
3.1.2 Lot-by-lot testing
3.1.3 Periodic testing
3.2 Test methods
3.3 Qualification approval
3.4 Assessed process average procedures (APA)
3.5 Delayed delivery
Tables
1 Percentage change in resistance
2 Limits of change in resistance
Annexes
A.1 Fixed sample size Qualification Approval test schedules
for fixed power resistors
A.2 Fixed sample size Qualification Approval test schedule
for fixed power resistors