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Intel ATX Power Supply Design Guide
Version 0.9
Page 26
5. Environmental Requirements
5.1 Temperature
Operating ambient +10 °C min
+50 °C max
(At full load, with a maximum rate of change of 5 °C/10
minutes, but no more than 10 °C/hr.)
Nonoperating ambient -40 °C to +70 °C
(Maximum rate of change of 20 °C/hr.)
5.2 Thermal Shock (Shipping)
Nonoperating -40 °C to +70 °C; 15 °C/min ≤ dT/dt ≤ 30 °C/min; 50 cycles;
Duration of exposure to temperature extremes for each half
cycle shall be 30 minutes.
5.3 Humidity
Operating To 85% relative humidity (noncondensing)
Nonoperating To 95% relative humidity (noncondensing)
Note: 95% RH is achieved with a dry bulb temperature of
55 °C and a wet bulb temperature of 54 °C.
5.4 Altitude
Operating To 10,000 ft
Nonoperating To 50,000 ft
5.5 Mechanical Shock
Nonoperating 50 g, trapezoidal input; velocity change ≥ 170 in/s.
Three drops on each of six faces are applied to each sample.