ETAS ES1337.2, Руководство пользователя

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Hardware Features 11
2 Hardware Features
This section contains information on the features of the ES1337.2 Signal Gen-
erator Board.
2.1 Wheel Speed Sensors
This section contains a description of the types of wheel speed sensor that can
be simulated with the ES1337.2 Signal Generator Board.
• "Type “DF6”" on page 12
• "Type “DF10”" on page 13
• "Type “DF10-RotDir”" on page 14
• "Type “DF11i”" on page 15
• "Type “VDA”" on page 17
A basic distinction is made between two processes for recording wheel speeds:
passive and active sensors.
With passive sensors, there is usually an encoder wheel made of ferromagnetic
material which closely runs past a magnet surrounded by a coil. This results in
a constant change of the magnetic flux density which induces a voltage in the
coil.
Active sensors often use an encoder wheel made of alternately opposing mag-
netized segments – the signal is generated in an active circuit by measuring the
magnetoresistance or the Hall effect in a sensor.