Hall Effect Sensor Output Signal

When the magnetic flux density around the sensor exceeds a certain pre set threshold the sensor detects it and generates an output voltage called the hall voltage v h.

Hall effect sensor output signal.

Hall effect sensors are used for proximity sensing positioning speed detection and current sensing applications. As the tooth passes beneath the hall sensor the circuit becomes activated and pulls this 5 volt signal to ground. The four blocks contained within the sensing device figure 1 1 will be exam ined in detail in the following chapters. The signal from the sensor is shown and can be downloaded.

Source voltage is now present in the signal circuit. The digital speed sensor output is utilized for counting computing and input to many control processes. If the regulator is a 5 volt source the signal voltage is now 5 volts. As they consume power hall effect cmp sensors require voltage feed and earth circuits.

The quadrature hall effect sensor. Unlike inductive sensors the output signal from a hall effect sensor is not effected by the rate of change of the magnetic field. The produced output voltage typically is in the range of milli. This feature of hall effect technology allows you to make speed sensors that can detect targets moving at arbitrarily slow speeds or even the presence or absence of nonmoving targets.

Many automotive hall effect sensors have a built in internal npn transistor with an open collector and grounded emitter meaning that rather than a voltage being produced at the hall sensor signal output wire the transistor is turned on providing a circuit to ground through the signal output wire. In a hall effect sensor all low level signal processing is performed on the silicon chip holding the transducer. When the current is fixed the greater the magnetic field strength the greater the hall effect voltage. The output signal from a hall effect sensor is the function of magnetic field density around the device.

The output interface converts the electrical signal from the hall sensor to a signal that meets the requirements of the application. Consider the diagram below. With a lab scope a 2 wire hall effect abs sensor signal voltage is measured with the wheel turned by hand. A hall effect sensor or simply hall sensor is a device to measure the magnitude of a magnetic field its output voltage is directly proportional to the magnetic field strength through it.

This cycle repeats itself to create the digital output from the gear tooth hall effect sensing device. The sensors have in built conditioning circuits that convert the hall voltage to a stable digital signal output switching between 0 v and 5 v. Quantity to be sensed input interface system mathematic hall element hall effect sensor. To help determining whether the 2 wire hall effect abs sensor is functioning correctly different deviations from the example signal are mentioned along with possible causes.