HP 9000 rp3410 Manual page 42

maximum input The operating current of the product equal to the maximum load divided by the minimum
current input voltage.
NEBS Network Equipment Building Standards. A set of safety guidelines. All electronic equipment
has the potential to interfere with other electronic equipment. Interference can be caused by
electromagnetic radiation, the grounding system, the electrical power connection, excessive
heat or blocking the natural airflow, and connecting wires or cables. The Federal Communications
Commission (FCC) regulates a portion of this problem through Part 15 of its rules and
regulations. Even more stringent than the FCC Part 15 requirements, NEBS covers a large range
of requirements, including criteria for personnel safety, protection of property, and operational
continuity. The documents cover such physical requirements as space planning, temperature,
humidity, fire, earthquake, vibration, transportation, acoustics, air quality, and illumination.
The documents also cover such electrical criteria as electrostatic discharge (ESD), electromagnetic
interference (EMI), lightning and AC power fault, steady state power induction, corrosion, DC
potential difference, electrical safety and bonding, and grounding.
O-R
PCA Printed Circuit Assembly, also referred to as a printed circuit board (PCB).
PCI Currently, the most popular local I/O bus, the Peripheral Component Interconnect (PCI) bus
was developed by Intel® and introduced in 1993.
PICMG A consortium of companies involved in utilizing PCI for embedded applications. The PCI
Industrial Computer Manufacturers Group (PICMG) controls the PICMG specification.
power factor The ratio of true power to apparent power in an AC circuit. In power conversion technology,
power factor is used in conjunction with describing the AC input current to the power supply.
RMS Root mean square. Term that refers to the most common mathematical method of defining the
effective voltage or current of an AC wave. To determine RMS value, three mathematical
operations are carried out on the function representing the AC waveform: (1) The square of the
waveform function (usually a sine wave) is determined. (2) The function resulting from step 1
is averaged over time. (3) The square root of the function resulting from step 2 is found.
S-T
theoretical Maximum wattage of a given configuration, assuming worst-case conditions (thermal tolerances,
maximum power work loads, and so forth) on all system components. It is extremely unlikely that any customer
consumption will experience this level of power consumption.
tonnage The unit of measure used in air-conditioning to describe the heating or cooling capacity of a
system. One ton of heat represents the amount of heat needed to melt 1 ton (2,000 lb) of ice in
1 hour and 12,000 Btu/h equals 1 ton of heat.
true power In an AC circuit, true power is the actual power consumed. It is distinguished from apparent
power by eliminating the reactive power component that may be present.
typical input The operating current of the product measured using a typical load and target voltage.
current
typical power Represents the expected power consumption of a given configuration. The typical value is the
consumption approximate power consumption that a customer will most likely experience and can use for
power budgeting purposes.
U-Z
vapor seal A vapor seal is an essential part of preventing moisture infiltration into or migration out of a
critical space, such as a data processing center or other room that contains sensitive electronic
instrumentation. Essentially, a vapor seal is a barrier that prevents air, moisture, and
contaminants from migrating through tiny cracks or pores in the walls, floor, and ceiling into
the critical space. Vapor barriers can be created using plastic film, vapor-retardant paint, vinyl
wall coverings, and vinyl floor systems, in combination with careful sealing of all openings
(doors and windows) into the room.
42 Glossary