直流风机可靠性寿命测试_图文

1、 EFB1512SHG EFB1524SHG EFB1524LG EFB1512VHG EFB1524VHG EFB1712SHG EFB1512HHG EFB1524HHG EFB1724SHG EFB1512HGEFB1524HGRepresentative Test P/N :EFB1524SHG 80,000hours minimum fan rated voltage and the temperature of 40 According to the equation for W eibull distribution ,560,000hours And we rely on a

2、zero failure Weibull test strategy and accelerated testing technique, to determine the total test time (t for verifying the above life estimation by the equations,where, (B r;c is Poisson distribution factor with the failure number of r equal to 0 and the decimal confidence level of c equal to 0.90(

3、90%.Stress/ElevatedTemperature Ts ( Actual Test Temperature Unstress Temperature Tu (Acceleration Factor A FQuantity of Test Devices n (pcsPoisson Distribution Factor B r;cRequired test time with zerofailure t (hoursActual test time with zero failure t (hoursVerified MTTF 40 (hoursVerified L 1040 (h

4、ours70408.0056 2.3033,9753,975.0560,05580,008Test Progress:Note: The test sample equivalent to S TD , Part number: EFB1524SHG.DC FAN LIFE EXPERIMENT REPORTAvailable for these models with lower speed and same physical structure. All model may be followed by Rxx or Fxx series suffixes.This test report

5、 applies to EFB150x172x50.8mm series as the right tableEquipment: E24-F0031On/Off Cycles: Every 500 hours L 10 Expectancy:MTTF 7×L10 =t = 1.036×MTTF×(B r;c ÷ n0.91÷A F , and A F = 2(Ts-Tu/10Available for these models with lower speed and same physical structure. All model may be followed by Rxx or Fxx series suffixes. This test report applies to EFB150x