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Term definitions

Shock Sensor Term definitions

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Operating sensitivity

Minimum impact and acceleration values that can be detected.

Detection frequency

Frequency range that can be detected.

Simple harmonic motion

Motion of pendulums or springs when the oscillation amplitude is a sinusoidal variation. In case of simple harmonic motion, the relation between the frequency (Hz), the oscillation amplitude D (mm) and the acceleration α (g) is as follows.



Frequency (f): The number of movements of the oscillating body by unit of time. The unit is Hz.

Oscillation amplitude (D): Oscillation displacement in mm.

Acceleration (α): Change rate of velocity over time. The unit is g.

Shock Sensor and acceleration sensor

Shock Sensor and acceleration sensors differ by their frequency characteristics. The output characteristics of an Shock Sensor change depending on the frequency. On the other hand, an acceleration sensor has flat output characteristics on a wide frequency range.

Operation configuration

Normally open (NO) sensors change their output to on (operation) when an impact is detected, and normally closed (NC) sensors change their output to off (reset) when an impact is detected. Select the operation configuration in accordance with your usage.

Output (open collector)

The collector of the output transistor (NPN or PNP) is an open type and can open and close currents of the rated load current and lower.
Be aware that if the load (between Vcc and OUT) short-circuits, and the sensor is switched on, the output transistor burns out.
When you use it as a voltage output type, connect a load resistance externally between Vcc and OUT, and use the voltage between GND and OUT as the control signal.

 

 

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