Specifications

12 007-4603-001
2: Site Preparation Concepts
Electrostatic Discharge
SGI designs and tests its products to ensure that they resist the effects of electrostatic
discharge (ESD). However, it is still possible for ESD to cause problems that range from
data errors and lockups to permanent component damage. To protect the systems from
ESD, follow these precautions:
• Minimize the use of carpeting at computer locations
(or consider special static-reducing carpet).
• Ensure that all electronic devices are properly grounded.
• Keep chassis doors and access panels closed while the system is operating.
• Fasten all screws, thumbnail-fasteners, and slide locks securely.
• Use a grounded static wrist strap whenever you work with the chassis or
components.
• Use antistatic packing material for storage and transportation.
• Clear the site of all devices that create static electricity or provide possible sources
of EMI.
Vibration
The SGI Origin 3900 server is designed for typical computer room environments; it
requires no special modifications or protection. If you plan to install a system at an
industrial site, ensure that vibration does not exceed the limits that Table 5-1 lists.
Humidity
Table 6-1 lists the maximum humidity levels for each rack, both operating and
nonoperating. Exposure to humidity levels above the rated maximums and/or exposure
to condensation can damage equipment.
Humidity Gradient
Table 6-1 lists the maximum humidity gradient for the system. The humidity gradient is
the rate at which the humidity changes, which is typically expressed in percent relative
humidity per hour. Humidity changes that are more rapid than the given rate can damage
some of the components in the system.
Unless otherwise indicated, the humidity gradients that are listed apply whether or not
the system is operating.