Polarity of output voltage from an accelerometer

If the fixing direction of the acceleration to the sample turns inside out to the sensing axis, are the detection phases shifts 180 degrees as well? For example, when the vertical vibration of paper is measured, the unit fixing direction is reversal if the NP-3210 is fixed at front surface of the paper or the rear surface of the paper. Does the phase of detected vibration shift 180 degrees as well?

 

Measurement direction is an axis direction (cylinder) of the accelerometer. For example, when the accelerometer is fixed in downward direction on a horizontal paper surface and hit the paper surface in upward with fingers, the output polarity becomes + voltage. When it hits the paper surface in downward with fingers, the output polarity becomes - voltage. Reversely, when the accelerometer is fixed in upward direction to a horizontal paper surface, and hit the paper surface in upward with fingers, the output polarity becomes - voltage.


The voltage is changed from + to -, so phase of detected vibration will be shifted 180 degrees.

 

Some of the charge amplifier are inverted (shift 180 degrees) the polarity at the amplifier side.
To check the voltage output polarity, lightly tap the accelerometer with a finger tip.

 

CH-100, CH-1200 charge amplifier
CH-6130, CH-6140 charges converter
Inverted output
DS-2000 series CF-3200J/3400J analyzer (For directly input)
Amplifier for PS-601, PS-1300, SR-2200, NP-3000 series

Directly output

 

Revised:2007/02/19


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