Black Box SP361A-R2 Manual De Usuario
BLACK BOX
®
2 of 4
06/09/2010
#11141
»
Protect against surges, damage caused by
induced lightning, electrostatic dis charges,
noise, and ground loops.
noise, and ground loops.
»
Surge protectors are available for various
network types.
»
Protectors are also available for various
communication lines.
»
We even carry surge protectors for special
equipment, such as CATV, keyboards,
and more!
and more!
FeaTures
Here’s why you need a
surge protector
:
In an ideal world, the flow of electrical current in your com puter
systems would be equal at all times. No outside power disturbances
would disrupt the balance of power in your electronic devices.
would disrupt the balance of power in your electronic devices.
In the real world, however, several forms of power disturb ances
can wreak havoc on your electrical devices. These power disturbances
come in the forms of induced transients (which include lightning,
electrostatic discharge [ESD], and noise), ground-loop currents,
and surges.
come in the forms of induced transients (which include lightning,
electrostatic discharge [ESD], and noise), ground-loop currents,
and surges.
Although only a lightning arrestor can protect against direct
lightning hits, a surge protector can guard your equipment against
damage caused by induced lightning. To understand the need for
this protection, consider the enormous magnitude of energy that
a lightning strike generates. As this large current flows through
conductors, the expanding mag netic field causes induced current
to flow in nearby conductors that could then carry damaging
impul ses to computers.
damage caused by induced lightning. To understand the need for
this protection, consider the enormous magnitude of energy that
a lightning strike generates. As this large current flows through
conductors, the expanding mag netic field causes induced current
to flow in nearby conductors that could then carry damaging
impul ses to computers.
A
surge protector
can also guard against the second type of
induced transient, electrostatic discharge (ESD). What we commonly
think of as static is that zap we get when we grab something metallic
after walking across a carpet during the winter. This static is actually
called triboelectricity, from the Greek word tribo, which means
rubbing. When two unlike materials rub together, the electrons from
one and the electrons from the other produce a negative charge (or
electrostatic discharge), causing a potential difference between the
two surfaces. The excess electrons look for a discharge path, which
they find in any good conductor. The excess energy can damage your
equipment.
think of as static is that zap we get when we grab something metallic
after walking across a carpet during the winter. This static is actually
called triboelectricity, from the Greek word tribo, which means
rubbing. When two unlike materials rub together, the electrons from
one and the electrons from the other produce a negative charge (or
electrostatic discharge), causing a potential difference between the
two surfaces. The excess electrons look for a discharge path, which
they find in any good conductor. The excess energy can damage your
equipment.
A third type of induced tran sient, noise, can also damage your
equipment. Noise is a signal appearing in a circuit other than the
desired signal. It can result from lightning or ESD, but more commonly
desired signal. It can result from lightning or ESD, but more commonly
OVERVIEW
results from other events happening in the environ ment. Low-
magnitude noise does not bother a PC, but high-magnitude noise
or impulses can interfere with data processing or damage internal
components. Noise as it appears on power lines comes in two
varieties: normal-mode and common-mode noise. Turning large
loads off or on, or shunting utility power-factor correcting capacitors
across the line, creates normal-mode noise. Lightning, tripping and
reclosing utility breakers, poor grounding techniques, ground faults,
radio transmitters, time clocks, and machine tools can cause common-
mode noise.
magnitude noise does not bother a PC, but high-magnitude noise
or impulses can interfere with data processing or damage internal
components. Noise as it appears on power lines comes in two
varieties: normal-mode and common-mode noise. Turning large
loads off or on, or shunting utility power-factor correcting capacitors
across the line, creates normal-mode noise. Lightning, tripping and
reclosing utility breakers, poor grounding techniques, ground faults,
radio transmitters, time clocks, and machine tools can cause common-
mode noise.
Another hazardous form of power disturbance is called a ground
loop. A ground loop is formed when a potential difference exists
between any two places that are, by definition, at ground potential.
A ground loop may form in a circuit when the circuit contains two or
more different ground connections. This circuit may also be formed
between boards inside a PC or in a local area network. Whenever
there is some impedance existing between two points, voltage
can appear across these points and current can flow. Ground
loops can also develop because of a circuit wire’s length.
between any two places that are, by definition, at ground potential.
A ground loop may form in a circuit when the circuit contains two or
more different ground connections. This circuit may also be formed
between boards inside a PC or in a local area network. Whenever
there is some impedance existing between two points, voltage
can appear across these points and current can flow. Ground
loops can also develop because of a circuit wire’s length.
The final type of power disturbance which the protectors guard
against is, quite obviously, surges. A surge is a short-term voltage
increase that exceeds established upper limits for less than 2.5
seconds. Each type of electrical interface contained in your data
communications equipment has an acceptable operating voltage
range. Voltages above the range of the particular device’s interface
can damage the device in two ways. First, a massive voltage (called
a spike) can immediately damage your equipment. Second, multiple
smaller out-of-range voltages can gradually damage your equipment
over time.
increase that exceeds established upper limits for less than 2.5
seconds. Each type of electrical interface contained in your data
communications equipment has an acceptable operating voltage
range. Voltages above the range of the particular device’s interface
can damage the device in two ways. First, a massive voltage (called
a spike) can immediately damage your equipment. Second, multiple
smaller out-of-range voltages can gradually damage your equipment
over time.
Our
surge protectors
provide an immediate path to ground,
so power disturbances go straight to ground instead of to your
equipment.
equipment.