The **WIW1028-R-101** is a precision electronic component, specifically a **multi-turn trimming potentiometer** (often called a "trimpot"). These are used to calibrate or adjust electrical parameters within a circuit. --- ### 1. Technical Specifications The part number follows a specific nomenclature used by manufacturers (like Suntan or various industrial suppliers). Here are the primary specifications: | Feature | Specification | | :--- | :--- | | **Component Type** | Precision Multi-turn Trimming Potentiometer | | **Resistance Value** | 100 $\Omega$ (indicated by the "101" code) | | **Tolerance** | ±10% (standard) | | **Adjustment Turns** | 22 to 28 turns (approximate) | | **Power Rating** | 0.5 Watts (at 70°C) | | **Mounting Type** | Through-hole (PCB) | | **Termination Style** | PC Pins (Lead wires) | --- ### 2. Part Number Breakdown Understanding the code helps in identifying replacements or equivalents: * **WIW1028:** The series/model number. This typically refers to a **rectangular** body shape with a side-adjustment screw. * **R:** Usually indicates the orientation or lead style (e.g., standard pin spacing). * **101:** The resistance code. * **10** = The first two digits. * **1** = The multiplier (number of zeros). * $10 \times 10^1 = 100$ Ohms. --- ### 3. Internal Construction and Mechanics The WIW1028 series utilizes a **Cermet** (Ceramic-Metal) resistive element. * **Multiturn Mechanism:** Unlike a standard volume knob that rotates ~300°, this requires multiple full rotations to move the "wiper" from one end of the resistor to the other. This allows for extremely fine tuning. * **Wiper:** A small metal contact that slides along the cermet track. * **Clutch:** Most units include an "idling" clutch at the end of the travel to prevent damage if the screw is turned too far. --- ### 4. Applications This component is commonly found in: * **Power Supplies:** For fine-tuning output voltage. * **Sensors:** To calibrate the "zero" point or sensitivity. * **Audio Equipment:** To set bias currents in amplifiers. * **Industrial Controllers:** Where precision resistance is required to match specific signal levels. --- ### 5. Physical Dimensions (Typical) * **Shape:** Rectangular. * **Size:** Approximately 10mm x 10mm x 5mm (Standard 3/8" square type). * **Adjustment:** Side-adjust (the screw is located on the side of the housing).