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ATX12V Power Supply Design Guide
Version 2.0
37
5. Environmental
The following subsections define recommended environmental specifications and test
parameters, based on the typical conditions to which an ATX12V power supply may be
subjected during operation or shipment.
5.1. Temperature
Operating ambient +10 °C to +50 °C
(At full load, with a maximum temperature rate of change of
5 °C/10 minutes, but no more than 10 °C/hr.)
Non-operating ambient -40 °C to +70 °C
(Maximum temperature rate of change of 20 °C/hr.)
5.2. Thermal Shock (Shipping)
Non-operating -40 °C to +70 °C
15 °C/min ≤ dT/dt ≤ 30 °C/min
Tested for 50 cycles; Duration of exposure to temperature
extremes for each half cycle shall be 30 minutes.
5.3. Humidity
Operating To 85% relative humidity (non-condensing)
Non-operating To 95% relative humidity (non-condensing)
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
Non-operating To 50,000 ft