## Electronic Specifications: WSP-24B-R/E The **WSP-24B-R/E** is a high-precision, industrial-grade **wire-wound linear potentiometer** (often referred to as a "displacement sensor" or "draw-wire sensor" component). It is manufactured by companies like Midori Precisions and is designed for measuring linear position via a rotating resistive element. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Full Stroke Range** | 2400 mm (2.4 Meters) | | **Total Resistance** | 2 kΩ (standard, varies by sub-model) | | **Resistance Tolerance** | ±10% to ±15% | | **Independent Linearity** | ±0.1% to ±0.2% | | **Power Rating** | Approximately 1.0W (at 40°C) | | **Output Type** | Analog (Potentiometric voltage divider) | | **Effective Electrical Angle** | 3600° (10-turn internal pot) | --- ### 2. Internal Electronic Structure The device functions as a **voltage divider**. Inside the housing, the wire drum is coupled to a multi-turn precision potentiometer. #### Wiring Configuration Most units follow a standard 3-wire color code or terminal numbering: | Terminal | Function | Description | | :--- | :--- | :--- | | **1 (Red)** | Input (Vcc) | Positive DC supply voltage | | **2 (White)** | Output (Wiper) | Signal voltage varying with wire extension | | **3 (Black)** | Ground (GND) | Common return / Negative | --- ### 3. Electronic Characteristics * **Resolution:** Theoretically infinite. Because it uses a wire-wound resistive element, the resolution is limited only by the "step" between individual wire turns on the internal potentiometer coil. * **Temperature Coefficient:** Typically ±50 to ±100 ppm/°C, ensuring stability in varying industrial environments. * **Insulation Resistance:** Minimum 100MΩ at 500V DC. * **Dielectric Strength:** 500V AC for 1 minute. --- ### 4. Implementation Example (Microcontroller) To read the position of the WSP-24B-R/E using an Arduino or similar ADC, use the following circuit logic: ```cpp // Basic Arduino code to read displacement const int potPin = A0; // Connected to White wire float strokeLength = 2400.0; // 2400mm void setup() { Serial.begin(9600); } void loop() { int rawValue = analogRead(potPin); // Convert 10-bit ADC value (0-1023) to Millimeters float position = (rawValue / 1023.0) * strokeLength; Serial.print("Current Position: "); Serial.print(position); Serial.println(" mm"); delay(100); } ``` --- ### 5. Application Notes * **Voltage Supply:** Ensure the input voltage does not exceed the power rating ($P = V^2 / R$). For a 2kΩ pot at 1W, the maximum voltage is approximately 44V DC, though 5V, 10V, or 24V are standard. * **Noise Filtering:** In industrial settings, it is recommended to add a 0.1μF capacitor between the signal (White) and GND (Black) to filter mechanical "wiper noise."