The Model 64B Accelerometer is based on an advanced piezoresistive MEMS sensing element which offers exceptional dynamic range and stability.
This accelerometer sensor features a full bridge output configuration with a temperature range from 0 to +50º C. A slight amount of internal gas damping provides outstanding shock survivability and a flat amplitude and phase response up to 7kHz. The Model 64B is compliant with SAE J211 standards for anthropomorphic dummy instrumentation.
Accelerometers measure the acceleration or vibration of a device or system. Physically, the accelerometer can be considered as nothing more than a weight on a spring which is connected to a frame. When the frame is moved, the mass will stay at rest until the spring, being stretched, can exert enough energy on the mass to make it move.
What is difference between piezo-electric (PE), piezo-resistive (PR) and variable capacitance (VC) accelerometers?
The word “piezo” comes from the Greek word “piezein” which means to press or squeeze. In this case, this refers to a basic characteristic of the material; when pressed or subjected to force, piezoelectric (PE) materials develop an electric charge and piezoresistive (PR) materials exhibit a change in resistance. Variable Capacitance (VC) sensors are essentially accelerometers that derive the acceleration measurement from a change in capacitance of a seismic mass moving between two parallel capacitor plates. These are the principles of operation of most accelerometers in use today.
What is the term damping referring to in piezo-resistive accelerometers?
By providing a narrow gap between two large moving plates, air is displaced, and this displacement slows the motion of the mass, thus damping the movement. If the gap is not well-controlled, the piezo-resistive accelerometer may be either grossly underdamped or overdamped. The problem with overdamping is the loss of useful bandwidth from the sensor. For underdamped devices, the accelerometer is more prone to signal distortion and breakage when excited near the peak response. For instance, a device with a Q of 10 will indicate 10 times gain at resonance and a 1g acceleration input will excite the seismic mass to 10g.
Please review product documents or contact us for the latest agency approval information.
Product Type Features
Accelerometer Type MEMS DC
Vibration Sensor Product Type DC Response Plug & Play Accelerometers
Electrical Connection Integral Cable
Full Scale Output Voltage (VDC)±.1
Excitation Voltage (VDC)2 – 10
Zero Acceleration Output (mV)±25
Frequency Response (Hz)0-1400 to 0-7000
Primary Product Material Anodized Aluminum
Number of Sensing Axes Uniaxial
Product Weight 1 g [ .035 oz ]
Mounting Type Screw
Operating Temperature Range -40 – 125 °C [ -40 – 257 °F ]
IP Rating IP66
Acceleration Range (±) (g)50, 100, 200, 500, 2000, 6000