Y-E Data YD-380 - Page 30

Y-E Data YD-380

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HOW

TO

USE

THE

CE

DISK

AND

CONVERSION

CHART

1.

Preparation

a)

The

test

should

be performed

at

a

temperature

of

13°C

to

33°C, and a

relative

humidity

of

20%

to

80%.

Humidity

compensation

is.

required

if

the

humidity

is

not

50%.

b)

Before

using

the

CE

disk,

allow

a

minimum

of

two

hours

for

the

drive

(with

DC

power on) and

the

disk

to

adapt

to

the

ambient

temperature

and

humidity

of

the

test

area.

2• Measurement

a)

Refer

to

4.14.1

for

test

equipment and

set-up

proce-

dure.

b)

Find

the

pos1t10ning

error

corresponding

to

AlB

or

BfA

on

the

conversion

chart

printed

on

the

CE

disk

envelope.

Example:

When

BIA

=

0.9,

the

conversion

chart

shows

the

positioning

error

to

be +P

~.

AlB

or

BIA

BIA

(+)

Outer

0.5

AlB

0.6

0.7/

0.8

.9

+P

Figure

4.14.2

AlB

(-)'

Inner