MTBF计算方式

M.T.B.F DEMO TEST

MODEL :

3.21.1TEST CONDITION:

1. HUMIDITY : 30%~85%

2. TEMP.: 40 ~ 45 ?

3. CONFIDENCE LEVEL : 90%

4. VOLTAGE : 90 ~ 264Vac

Remark:

MIL STD-781 (POISSON) CONFIDENCE LEVEL

3.21.2NOTE

TL = TOTAL LIFE TIME n = NUMBER OF TEST SET Tr = ROOM TEMP.

Ta = ENVIRONMENT TEMP.

C.L (R) = CONFIDENCE LEVEL Ft = HRS BEFORE FAILURE OCCURRED

FCC = 2 (Ta-Tr) / 10 = 2(40-25)/10 = 21.5 = 2.8284

3.21.3RESULT:

REPORT BY:

DATE :

MUL270WHP

2016/6/5

Pass

DICK 49114.37=

hours