Environmental
38 Design Guide
6 Environmental
The following sections define environmental specifications and test parameters, based
on the typical conditions to which a power supply may be subjected during operation or
shipment.
6.1 Temperature – Recommended
• 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.)
6.2 Thermal Shock (Shipping) – Recommended
• 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.
6.3 Humidity – Recommended
• Operating To 85% relative humidity (non-condensing)
• Non-operating To 95% relative humidity (non-condensing)
• Note: 95% relative humidity is achieved with a dry bulb temperature of 55 °C and
a wet bulb temperature of 54 °C.
6.4 Altitude – Recommended
• Operating to 10,000 ft.
• Non-operating to 50,000 ft.
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