Apc BK600EI User Manual download pdf (Page 16)

Page 14

4.1 Noise and surge suppression

The UPS contains high performance EMI/RFI (Electro-Magnetic and Radio Frequency

Interference) noise and surge suppression circuitry to protect your computer equipment.

The UPS provides this suppression continuously, whether or not it is turned on. Nor-

mally, the UPS will continuously filter surges and electrical noise without using the battery

charge. The suppression circuitry will reduce the amplitude of these power disturbances

to conform to the strict requirements of all modern computing equipment.

The illustration above shows what a typical “medium” amplitude surge or spike looks like

when present on the utility voltage. Surges up to 15 times larger than this are easily

suppressed by the UPS. Surges are commonly caused by nearby lightning activity and

motor load switching created in air conditioners, elevators and heat pumps.

The illustration above shows what EMI/RFI noise looks like when present on the utility

voltage. The UPS “filters” out this noise with components whose electrical resistance is

very high at radio frequencies. EMI/RFI noise is commonly created by the same activity

which produces surges but can also be caused by nearby radio transmitters and blinking

neon bulbs and signs.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 39 40

No comments

Apc BK600EI User Manual Page 16