The **K5W-R2** is a high-performance, single-axis **Piezoelectric Accelerometer** manufactured by **Kyowa Electronic Instruments**. It is primarily used for measuring vibration and acceleration in industrial and research settings where small size and high frequency response are critical. --- ### Technical Specifications The following table highlights the key electronic and mechanical characteristics of the K5W-R2 sensor: | Feature | Specification | | :--- | :--- | | **Sensor Type** | Piezoelectric (Charge Output) | | **Rated Capacity** | ±4903 m/s² (Approx. ±500G) | | **Voltage Sensitivity** | Approx. 0.04 mV / (m/s²) | | **Frequency Response** | 5 Hz to 10 kHz (±5%) | | **Resonant Frequency** | Approx. 40 kHz | | **Operating Temperature** | -20°C to +100°C | | **Weight** | Approx. 2 grams (excluding cable) | | **Mounting** | M3 screw or Adhesive | --- ### Key Electronic Components & Working Principle 1. **Piezoelectric Element**: The core of the K5W-R2 is a piezoelectric ceramic or crystal. When subjected to mechanical stress (acceleration), it generates an electrical charge proportional to the applied force ($F = ma$). 2. **Charge Output**: This is a "passive" sensor, meaning it outputs a raw electrical charge. It typically requires an external **Charge Amplifier** or a signal conditioner to convert the high-impedance charge into a low-impedance voltage signal that can be read by a Data Acquisition (DAQ) system. 3. **Integrated Cable**: The "R2" suffix often denotes the specific cable configuration. These sensors use low-noise coaxial cables to prevent "triboelectric noise" (electrical interference caused by the cable moving or vibrating). 4. **Housing**: The internal electronics are encased in a stainless steel or titanium housing to provide electrical shielding (Faraday cage effect) against Electromagnetic Interference (EMI). ### Connection Diagram (Typical) To integrate the K5W-R2 into a system, the signal flow usually follows this path: ```text [ K5W-R2 Sensor ] --> [ Low-Noise Cable ] --> [ Charge Amplifier ] --> [ DAQ / Oscilloscope ] ``` --- ### Application Notes * **High Rigidity:** Because of its high resonant frequency (40 kHz), it is excellent for detecting high-speed vibrations in rotating machinery or impact tests. * **Grounding:** Ensure the sensor is properly grounded or isolated to prevent ground loops, which can introduce 50/60 Hz hum into the measurements. * **Signal Conditioning:** Do not connect this sensor directly to a standard voltage input without a charge converter, as the signal will be too weak and the impedance mismatch will lead to inaccurate data.