Intel ATX12V manual Environmental, Temperature, Thermal Shock Shipping, Humidity, Altitude

ATX12V Power Supply Design Guide

Version 2.0

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

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