MAC TOOLS EM721 - Page 57

800.MACTOOLS
57
Hall-Effect Sensor (Voltage) Test
This test checks for switching action of the Hall-Effect position sensor.
Red
Fixed position
magnet
Signal
output (+12V)
Hall-Effect
device
Switching
transistor
Insert a thin
metal blade
between Hall-
Effect device
and magnet
Connect
to battery
Black
Meter setup to check Hall-Effect sensors:
• Set the rotary switch to voltage ( ) setting.
• Insert the black lead in the “COM” jack.
• Insert the red lead in the “ ” jack.
Connect:
• Black test probe to the ground terminal of the Hall-Effect sensor.
• Red test probe to the signal output terminal of the Hall-Effect sensor.
Insert a thin metal blade or steel feeler gauge between the Hall-Effect device and the magnet while watching
the bargraph and the display.
The output signal should vary from 12V to 0V. Inserting the metal blade blocks the magnetic eld from getting
to the Hall-Effect sensor; removing the metal blade allows the magnetic eld to reach the sensor.