Basic Knowledge of Magnetic Pattern Recognition Sensors
Testing Methods
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Sensor Noise Testing Method
This testing method is used to measure the noise generated from the sensor.
Testing Circuit
Testing Methods
- Measure noise by using the measuring circuit with an oscilloscope. The head surface must be free from magnetism. (Do not place a magnetic object near the head surface.)
- The measuring range of the oscilloscope is 0.5V/DIV or 50ms/DIV.
- To prevent static electricity from the body from affecting the measurement results, the person who conducts this test should wear an earth band.
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Piezoelectric Noise Testing Method
Piezoelectric noise is a voltage generated between both ends of an element (resistor) when external stress is applied to the element (resistor). The element is protected by a space between the element and case, so that external forces will not affect the measurement results.
Testing Circuit
The sensor noise measuring circuit is used.
Testing Methods
- A card is scanned with the sensor's detecting surface, as shown below:
- Apply 5±0.1VDC to the sensor, and apply 98mN spring load to the transport roller. Through the sensor noise measuring circuit (gain: x 10,000), measure the voltage generated when the card is transported at a speed of 2mm/s.
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Basic Knowledge of Magnetic Pattern Recognition Sensors
