The **DMR35-DCV2-DC1-R** is a precision digital panel meter manufactured by **Murata Power Solutions** (formerly Datel). It is specifically designed to measure and display DC voltage in industrial environments. Below is a breakdown of its technical specifications and electronic components. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Measurement Type** | DC Voltage (DCV) | | **Input Range** | 0 to 200V DC | | **Power Supply** | 9 to 32V DC (Non-isolated) | | **Display Type** | 3.5 Digit LED (0.8" / 20.3mm height) | | **Display Color** | Red | | **Accuracy** | ±0.1% of Full Scale ±1 Count | | **Sampling Rate** | 2.5 readings per second | | **Mounting** | Round 2.25" (57mm) Cutout | --- ### 2. Internal Electronic Components & Construction The device is built using high-reliability surface-mount technology (SMT) to ensure accuracy under thermal stress. #### A. Analog-to-Digital Converter (ADC) The core of the unit is an integrating **A/D Converter**. This component converts the incoming analog DC voltage into a digital signal. The "3.5 digit" specification means it can display numbers up to **1999**, allowing for high resolution (e.g., displaying 199.9V). #### B. Precision Resistor Network (Attenuator) Since the internal circuitry cannot handle 200V directly, it uses a **precision voltage divider** made of high-stability metal-film resistors. These resistors have very low temperature coefficients to prevent "drift" as the device warms up. #### C. Power Management Circuitry The **DC1** suffix indicates the power requirement. It includes an internal buck regulator or LDO (Low Dropout Regulator) that takes the 9-32V DC input and stabilizes it to the 3.3V or 5V required for the LED drivers and the MCU/ADC. #### D. The LED Display Module The **-R** suffix denotes a **Red** LED display. This module consists of seven-segment digits driven by a dedicated constant-current driver IC to ensure uniform brightness regardless of fluctuations in the supply voltage. --- ### 3. Wiring and Connection Pinout The rear of the unit typically features a screw-terminal block for secure industrial wiring. | Terminal | Function | Description | | :--- | :--- | :--- | | **V+** | Power Supply (+) | Connect to 9-32V DC source | | **V-** | Power Supply (-) | Ground / Common for power | | **In Hi** | Signal Input (+) | Positive lead of the voltage being measured | | **In Lo** | Signal Input (-) | Negative lead of the voltage being measured | --- ### 4. Dimensional and Environmental Data * **Protection:** Front panel is typically rated **IP65 / NEMA 4X** (when installed with the gasket), making it resistant to moisture and dust. * **Operating Temp:** -25°C to +60°C. * **Form Factor:** Designed to fit standard 2.25-inch round holes, often found in traditional analog meter replacements.