The **EM14R0B-R28-R032S** is a specific part number for a rotary optical encoder manufactured by **Bourns**. It is commonly used in human-machine interface (HMI) applications where high reliability and precision are required. --- ### 1. Component Overview The EM14 series consists of 14 mm rotary optical encoders. Unlike mechanical encoders that rely on physical contact, optical encoders use light and a photodetector, which significantly increases the component's lifespan and signal stability. ### 2. Part Number Breakdown The suffix `EM14R0B-R28-R032S` defines its specific electrical and physical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **EM14** | Series Name | 14 mm Rotary Optical Encoder | | **R** | Terminal Style | Rear Facing PC Pins | | **0** | Housing Style | Standard Bushing | | **B** | Switching / Output | 2-bit Gray Code (Quadrature) | | **R28** | Shaft Length | 7/8" (22.2 mm) Long Shaft | | **R** | Shaft Style | Round Shaft | | **032** | Resolution | 32 Pulses Per Revolution (PPR) | | **S** | Switch Option | Includes Push-Momentary Switch | --- ### 3. Key Technical Specifications #### Electrical Characteristics * **Supply Voltage:** 5.0 VDC ±0.25 VDC. * **Supply Current:** 26 mA maximum. * **Output Type:** CMOS compatible (High/Low). * **Output Format:** 2-bit Quadrature (Phase A and Phase B). * **Contact Bounce:** None (Optical technology eliminates the "debounce" issues found in mechanical switches). #### Mechanical Characteristics * **Rotational Life:** Up to 1,000,000 cycles (much higher than mechanical equivalents). * **Switch Life:** 100,000 cycles (for the push-button feature). * **Operating Temperature:** -40°C to +70°C. --- ### 4. Comparison: Optical vs. Mechanical | Feature | Optical (EM14) | Mechanical | | :--- | :--- | :--- | | **Durability** | Extremely High | Moderate | | **Signal Noise** | Clean / No Bounce | Significant Noise (requires filtering) | | **Precision** | High | Low/Medium | | **Cost** | Higher | Lower | --- ### 5. Common Applications * **Medical Equipment:** Precision adjustment for patient monitors or diagnostic tools. * **Audio Gear:** Digital volume controls and parameter selection in professional mixers. * **Industrial Controls:** Settings adjustment for PLC interfaces. * **Test & Measurement:** Oscilloscopes and signal generators.