The **ACTA-131-R** is a high-performance, single-axis analog MEMS (Micro-Electro-Mechanical Systems) accelerometer designed primarily for industrial and structural health monitoring. It is known for its high sensitivity and low noise floor. --- ### 1. Key Technical Specifications The following table summarizes the primary electronic characteristics of the ACTA-131-R: | Parameter | Specification | | :--- | :--- | | **Measurement Range** | ±1g (standard) | | **Sensitivity** | 2000 mV/g | | **Frequency Response** | 0.1 Hz to 1500 Hz | | **Supply Voltage** | 8 to 30 VDC | | **Current Consumption** | < 10 mA | | **Output Type** | Differential Analog | | **Noise Density** | 10 µg/√Hz | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Core Electronic Components & Architecture The internal circuitry of the ACTA-131-R is composed of three main functional blocks: #### A. MEMS Sensing Element * **Structure:** It utilizes a capacitive micromachined silicon structure. * **Function:** When acceleration is applied, a proof mass moves, changing the capacitance between fixed and moving electrodes. This physical displacement is the "input" for the electronic chain. #### B. Signal Conditioning ASIC * **Amplification:** Because the raw change in capacitance is minute, an Application-Specific Integrated Circuit (ASIC) converts the capacitance change into a high-level voltage signal. * **Filtering:** The sensor includes internal low-pass filtering to reduce high-frequency electronic noise and prevent aliasing in data acquisition systems. #### C. Power Management Circuitry * **Regulation:** The device accepts a wide range of input voltages (8-30V). Internal regulators stabilize this down to a clean 3.3V or 5V for the MEMS sensor and ASIC to ensure output consistency despite power supply fluctuations. --- ### 3. Connection and Interface The ACTA-131-R typically uses a multi-pin connector (often a MIL-C-26482 or similar) or an integrated cable. The wiring logic is as follows: ```yaml Pin/Wire Color | Function | Description ---------------|------------------|--------------------------- Red | Supply (+) | Positive DC Power Input Black | Common (GND) | Ground / Power Return White | Signal (+) | Positive Differential Output Green | Signal (-) | Negative Differential Output Shield | Case Ground | Connected to sensor housing ``` ### 4. Distinctive Features 1. **Differential Output:** The electronic output is differential, which helps reject Common-Mode Noise—essential for long cable runs in industrial environments. 2. **High Sensitivity:** At 2000 mV/g, it is much more sensitive than standard consumer accelerometers, allowing it to detect minute vibrations in bridges, buildings, or large machinery. 3. **Hermetic Sealing:** The electronics are usually housed in a ruggedized, IP67 or IP68 rated enclosure to protect the sensitive MEMS die from moisture and contaminants.