Black Box SP214A-R3 ユーザーズマニュアル

724-746-5500

   blackbox.com

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  5  of  5

2/17/2014 

#26934

Power problems.

 Sags

The Threat — A sag is a decline in the voltage level. Also 

known as “brownouts,” sags are the most common power  
problem.

The Cause — Sags can be caused locally by the start-up 

demands of electrical devices such as motors, compressors,  
and elevators. Sags may also happen during periods of high  
electrical use, such as during a heat wave.

The Effect — Sags are often the cause of “unexplained”  

computer glitches such as system crashes, frozen keyboards,  
and data loss. Sags can also reduce the efficiency and lifespan of 
electrical motors.
Blackouts

The Threat — A blackout is a total loss of power.
The Cause — Blackouts are caused by excessive demand on 

the power grid, an act of nature such as lightning or an earth-
quake, or a human accident such as a car hitting a power pole or 
a backhoe digging in the wrong place.

The Effect — Of course a blackout brings everything to  

a complete stop. You also lose any unsaved data stored in RAM 
and may even lose the total contents of your hard drive.

Spikes

The Threat — A spike, also called an impulse, is an instanta-

neous, dramatic increase in voltage.

The Cause — A spike is usually caused by a nearby lightning 

strike but may also occur when power is restored after a blackout.

The Effect — A spike can damage or completely destroy  

electrical components and also cause data loss.
Surges

The Threat — A surge is an increase in voltage lasting at least 

1

⁄

120

 of a second.

The Cause — When high-powered equipment such as an air 

conditioner is powered off, the excess voltage is dissipated though 
the power line causing a surge.

The Effect — Surges stress delicate electronic components 

causing them to wear out before their time.
Noise

The Threat — Electrical noise, more technically called electro-

magnetic interference (EMI) and radio frequency interference 
(RFI), interrupts the smooth sine wave expected from electrical 
power.

The Cause — Noise has many causes including nearby light-

ning, load switching, industrial equipment, and radio transmitters. 
It may be intermittent or chronic.

The Effect — Noise introduces errors into programs and data 

files.

Rackmount Power Strips 

 20-Amp 

 

 15-Amp 

 

Cabinet Power Strips 

 15-Amp

  48", 

10-Outlet 

 

  70", 

11-Outlet 

 

  77", 

12-Outlet 

 

 20-Amp

  24", 

8-Outlet 

 

  48", 

10-Outlet 

 

  70", 

11-Outlet 

 

  77", 

12-Outlet 

 

Rackmount Power Supplies

  with Surge Suppression

  20-Amp, 

switchless 

 

  20-Amp, with on/off switch 

 

What’s included
SP194A-R2, SP196A-R2, 

SP470A-R3, SP472A-R3:

✦

 Rackmount Power Strip

✦

 (4) 10-32 cuphead screws

✦

 (4) 12-24 cuphead screws

✦

 Specification sheet

SP197A-R2–SP199A-R2, 

SP216A-R2–SP217A-R2:

✦

 Cabinet Power Supply Strip

✦

 (3) clips, (3) screws, (3) nuts

✦

 Specification sheet

SP214A-R3:

✦

 Cabinet Power Supply Strip

✦

 (2) clips, (2) screws, (2) nuts

✦

 Specification sheet