The part number **500-199-R** primarily refers to a **Digital Caliper** manufactured by **Mitutoyo**, specifically a model within the *AOS (Advanced Onsite Sensor) Absolute* Digimatic series. While it is a mechanical measuring tool, its "electronic parts" are what define its high precision and functionality. --- ### Key Electronic Components and Features | Component | Description | Function | | :--- | :--- | :--- | | **AOS Sensor** | Advanced Onsite Sensor (Inductive) | Uses electromagnetic induction to resist interference from dirt, oil, and water on the scale. | | **ABSOLUTE Encoder** | Electrostatic Capacitance / Inductive | Eliminates the need to reset the zero point every time the tool is powered on. It "remembers" its position. | | **LCD Module** | Liquid Crystal Display | Provides a high-contrast digital readout of measurements (usually 4 to 5 digits). | | **SPC Output** | Data Port Pins | Allows the caliper to connect to a computer or data logger via a specialized cable for Quality Control. | | **SR44 Battery** | Silver Oxide Cell | The primary power source, typically providing ~3.5 to 5 years of life under normal use. | --- ### Technical Specifications (Electronic) 1. **Measurement System:** Electromagnetic induction absolute encoder. 2. **Resolution:** 0.01mm or .0005" (Standard for digital metrology). 3. **Power Supply:** One Silver Oxide Battery (SR44), Part No. 938882. 4. **Battery Life:** Approx. 3.5 years under normal use (up to 5 years in some conditions). 5. **Low Voltage Alarm:** A "B" or blinking icon appears on the LCD when the battery is low, preventing inaccurate readings. --- ### Functional Circuitry Logic The internal PCB (Printed Circuit Board) performs three main tasks: 1. **Signal Processing:** Converts the physical movement of the slider over the copper traces on the scale into a digital signal. 2. **Unit Conversion:** A logic chip toggles the display between Metric (mm) and Imperial (inch) units at the press of a button. 3. **Origin Memory:** The electronics maintain the "Home" position even when the display is turned off, provided the battery is not removed. ---