Class B Reliability Level Testing : Spectrum Control, Inc.

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Class B Reliability Level Testing

Class B is outlined in MIL-F-28861 and is prescribed for most military/aerospace requirements. It is more stringent than MIL-F-15733 requiring 100% screening that includes thermal shock, voltage conditioning and x-ray. Periodic Group B testing is performed on units selected at random from production lots.

Class B testing is performed on every production lot of EMI Filters and Capacitors

Class B Test Sequence Summary

Group II

Voltage and temperature limits of capacitance
Insertion loss: @ 25°C, +125°C, -55°C
AC voltage drop: (AC rated parts only)
Temperature rise
Barometric pressure
Insulation resistance: @ 25°C and 125°C
Overload: Apply 140% of rated current for 15 minutes
Resistance to solvents

Group III

Vibration: 3 planes
Vibration: (random) 3 planes
Thermal shock: 5 cycles
Seal test
Resistance to solder heat
Salt spray
X-ray inspection

Group IV

Shock
Terminal strength
Thermal shock
Seal
X-ray inspection

Group V

Life test: 1000 hrs

Group VI

Solderabilty

Performance Tests

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EMI & Surge Components & Modules

8061 Avonia Road · Fairview, PA · Phone: 814-474-1571 · Fax: 814-474-3110