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Measurement Testing
A Resource Dedicated to Environmental Testing, EMC Testing, Vibration Testing and related areas
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Mjr
Site Admin
Joined: 13 Jul 2005
Posts: 294
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 Posted: Wed Nov 30, 2005 4:26 am Post subject: Class B Reliability-Level Testing |
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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
* Shick
* Terminal strength
* Thermal shock
* Seal
* X-ray inspection
Group V
* Life test: 1000 hrs
Group VI
* Solderabilty
For more information, visit:
http://www.specemc.com
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