Environmental
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7 Environmental
The following subsections define environmental specifications and test parameters,
based on the typical conditions to which a power supply may be subjected during
operation or shipment.
7.1 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.)
7.2 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.
7.3 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.
7.4 Altitude – RECOMMENDED
• Operating to 10,000 ft.
• Non-operating to 50,000 ft.
7.5 Mechanical Shock – RECOMMENDED
• Non-operating 50 g, trapezoidal input; velocity change ≥ 170 in/s
• Three drops on each of six faces are applied to each sample.
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