Reliability; 2.10 Environmental; Environmental Specifications - Intel DQ77KB Specification

2.9

Reliability

The Mean Time Between Failures (MTBF) prediction is calculated using a parts count
method. The calculation is based on the Telcordia SR-332, Issue 2; Method I Case 3
50% electrical stress, 50 ºC ambient. The MTBF prediction is used to estimate repair
rates and spare parts requirements. The MTBF data is calculated from predicted data
at 50 ºC. The MTBF for the Intel Desktop Board DQ77KB is 90,690 hours.

2.10 Environmental

Table 48 lists the environmental specifications for the board.
Table 48. Environmental Specifications
Parameter
Temperature
Non-Operating
Operating
Shock
Unpackaged
Packaged
Vibration
Unpackaged
Packaged
Specification
-20 °C to +70 °C
0 °C to +55 °C
50 g trapezoidal waveform
Velocity change of 170 inches/s²
Half sine 2 millisecond
Product Weight (pounds)
<20
21-40
41-80
81-100
5 Hz to 20 Hz: 0.01 g² Hz sloping up to 0.02 g² Hz
20 Hz to 500 Hz: 0.02 g² Hz (flat)
5 Hz to 40 Hz: 0.015 g² Hz (flat)
40 Hz to 500 Hz: 0.015 g² Hz sloping down to 0.00015 g² Hz
Free Fall (inches) Velocity Change (inches/s²)
36 167
30 152
24 136
18 118
Technical Reference
79