—3—

DM-231

Basic Application

Rotation angular detection

Handling precautions

1) Most suitable magnetic

field intensity

When the external magnetic

field is at H=14400A/m,

rotation angle can be

detected most effectively.

Whe the external magnetic field H<14400A/m, output voltage shrinks.

When the external magnetic field H>14400A/m, the detection angle range shrinks.

Whe the external magnetic field H<14400A/m, the detection angle range becomes larger. In regions other

than -90° to +90°, the magnetic field combined with the bias magnetic field, shrinks down, which is not

advisable. Also, when the range to be detected is smaller than -90° to +90° it is more advantageous to turn to

H>14400A/m.

2) External magnetic field direction

With regards to the bias magnetic field, usage at other than ±90° should be avoided. That causes a decrease

in the combined magnetic field intensity, that is not recommended.

1

Out put

Differential amplifier

2

4

3

N

S

Out put

Magnetic field

angle

θ

–90°

0°

90°

231

θ

H

H=14400A/m

Magnetic field angle

θ

231

231

H

H

11

231

Out put

Magnetic field

angle

θ

–90°

0°

90°

θ

H

H>14400A/m

H=14400A/m

H<14400A/m