ETAS ES1337.2, Руководство пользователя

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Introduction 5
1 Introduction
This User’s Guide describes the ES1337.2 Signal Generator Board.
This section contains information on the basic functions and the area of use of
the ES1337.2 Signal Generator Board.
1.1 Areas of Use and Features
The correct determination of the wheel speed by wheel speed sensors is an
important prerequisite for the functioning of lots of ECUs for controlling the
braking force on each individual wheel (ABS, TCS and ESP). The control pre-
vents either the wheels blocking or the wheels spinning in an uncontrolled
manner. Navigation systems also access vehicle speed when the GPS signal is
weak or non-existent.
Wheel speed sensors are available in two basic designs:
• a passive design, in which the sensor element does not require an
external power supply
• an active design with an external power supply of the sensor element
The designs also differ in terms of the physical effect, on which the acquisition
of the wheel speeds is based, and the scope and content of the information
provided by the sensor.
CAUTION!
Some components of the ES1337.2 Signal Generator Board may
be damaged or even destroyed by static discharge. Leave the
board in its transport package until you want to install it.
The ES1337.2 Signal Generator Board should only be taken from
its package, configured and installed at a working place that is
protected against static discharge.
WARNING!
The components, connectors and conductors of the ES1337.2
Signal Generator Board may carry dangerous voltages. These volt-
ages may even exist if the ES1337.2 is not installed in the ES4100
or the ES4105 and the ES4100 or the ES4105 is powered off.
Make sure the ES1337.2 is protected against contact during oper-
ation. Disconnect all connectors to the ES1337.2 before removing
the board.