Hall - Effect Sensor

Hall - Effect Sensor

I hade use 5V poower supplay and connected the withe oscilloscop with refrence wire of distribuor , and spin the distributor observe the waveforme.

In bellow picture the oscilloscop pattren of hall effect sensor , that shows if we increse frequincy of dwell time , and also chnging firing time.

In his picture the top waveform is a dowell period which marked (A), and the bottom waveform is a firing time both in (ms).

Next chart record of out put voltage in diffren turened degere, and also pictures.

 

Degrees turned	Voltage
0	1.80 mv
60	2.0 mv
90	1.80 v
120	0.40 v
180
280	3.18 v

This sensor has got fixed firng periodand dwell period.

    Distributor Hall Effect Sensor waveform
This form of trigger device is a simple digital ‘on/off’ switch which produces a Square wave output that is recognised and processed by the ignition control module. The trigger has a rotating metal disc with openings; this passes between the electromagnet and the semiconductor. The effect of a magnetic field that is able to pass through one of the ‘windows’ will stop the flow of voltage. When the ‘window’ is closed the flow is reinstated. This action will produce a digital square wave that is understood by the Electronic Control Unit (ECM) or amplifier.
The sensor will have its characteristic three connections which are: a live supply voltage, an earth and the output signal. The square wave when monitored on an oscilloscope may vary in amplitude, this is not thought to be a problem as it is the frequency that is important, not the height of the voltage. When the voltage from the Hall effect trigger drops to zero volts, it fires the coil. This occurs when the ‘window’ on the metallic rotating vane opens.