The **M2UDS2-01-R/N** belongs to the **M2U Series** of universal digital panel meters manufactured by **M-System**. These devices are designed to accept various analog inputs and provide a digital readout and signal conversion. --- ### 1. Technical Specifications Below is a breakdown of the core electronic characteristics for this specific model: | Feature | Specification | | :--- | :--- | | **Input Type** | DC Voltage/Current (Universal) | | **Display** | 4-digit Red LED | | **Output** | DC Output (Retransmission) | | **Power Input** | 100 – 240V AC (Standard) | | **Accuracy** | ±0.1% of span | | **Sampling Rate** | 100 milliseconds | | **Operational Temp** | -5 to +55°C | --- ### 2. Key Electronic Components & Functions The internal architecture of the M2UDS2 revolves around three primary stages: #### A. Signal Conditioning (Input) The device features a high-impedance input stage that converts incoming signals (like 4-20mA or 1-5V DC) into a standardized internal voltage. It utilizes an **Analog-to-Digital Converter (ADC)** to translate the physical signal into a digital value for the microprocessor. #### B. Processing & Display * **Microprocessor:** Manages scaling, linearization, and alarm logic. * **LED Driver:** Controls the high-brightness 4-digit display. The "R" in the part number typically denotes a **Red** LED display. * **User Interface:** Tactile buttons on the front panel allow for digital scaling (e.g., setting 4mA to represent "0" and 20mA to represent "100"). #### C. Power Supply & Isolation * **Galvanic Isolation:** This is a critical electronic feature. The unit provides isolation between the input, output, and power terminals (typically 2000V AC). This protects the control system from ground loops and electrical noise. * **Switching Power Supply:** Designed to handle a wide range of AC voltages while maintaining low heat dissipation. --- ### 3. Part Number Breakdown * **M2UDS2:** Series identifier (Universal input digital indicator). * **01:** Specifically identifies the output signal type (often 4-20mA or 1-5V DC retransmission). * **R:** Red LED Display color. * **N:** No specific special options (Standard configuration). --- ### 4. Typical Wiring Diagram Logic | Terminal | Function | | :--- | :--- | | **1 - 2** | Power Supply (L, N) | | **3 - 4** | Analog Input (+, -) | | **5 - 6** | Retransmission Output (+, -) |