IBM 770 manual Electrical Specifications, System Overview, Acoustical Readings

Electrical Specifications

				(56	W)
Input	voltage		ñ	100–240
(V	ac)
Frequency		(Hz)		50/60
Input	ò	(kVA)		0.13
ñ	Range		is automatically	selected;	sine wave input is required.

òAt maximum configuration.

Figure

1-6. Electrical Specifications

Acoustical Readings

L

WAd in

bels

LpAm

in

dB

<L pA >m

in

dB

Operate

Idle

Operate

Idle

Operate

Idle

770

4.40

3.90

35.0

30.0

30.0

25.5

770 (with

4.60

4.30

37.5

34.0

31.0

28.0

SelectaDock

III)

Notes:

L WAd

Is

the

declared

sound

power

level

for the random

sample

of

machines.

L pAm

Is

the

mean

value

of

the

A-weighted

sound

pressure

levels

at

the

operator

position

(if

any)

for

the

random

sample of

machines.

<L pA >m

Is

the

mean

value

of

the

A-weighted

sound

pressure

levels

at

the

1

meter position for the random sample of machines.

Operate

Shows

the value

while

using

the

hard

disk

drive.

All measurements made in accordance with ANSI S12.10 and reported in

conformance

with

ISO

9296.

Figure

1-7. Acoustical Readings

System Overview 1-9