The **DMS-30DR-0-R-C** is a high-precision digital panel meter manufactured by Murata Power Solutions (formerly Datel). It is specifically designed as a 3.5-digit, self-powered or externally powered DC voltage monitor, often used for industrial process monitoring. --- ### ## Technical Specifications The following table outlines the primary electronic characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Display Type** | 3.5 Digit LED (0.56" height) | | **Display Color** | Red (Standard Intensity) | | **Input Range** | ±200mV to ±200V (depending on internal configuration) | | **Power Supply** | +5VDC (Nominal) | | **Accuracy** | ±0.05% of full scale ±1 count | | **Sampling Rate** | 2.5 samples per second | | **Input Impedance** | 1000 MΩ (Typical) | | **Operating Temp** | 0°C to +60°C | --- ### ### Key Electronic Components & Features #### 1. Analog-to-Digital Converter (ADC) At the heart of the unit is a high-performance **dual-slope integrating ADC**. This provides excellent noise rejection (especially 50/60Hz interference) and ensures long-term stability without frequent recalibration. #### 2. Display Driver & LED Matrix * **LED Technology:** The "R" in the part number denotes a **Red LED** display. * **Intensity:** It uses standard-intensity LEDs, which are optimized for indoor visibility. * **Auto-Polarity:** The electronics automatically detect and display a minus sign (-) for negative inputs. #### 3. Power Circuitry The **"0"** in the suffix indicates the power requirement. This specific model typically requires a regulated **+5V DC** supply. The internal circuitry includes: * **Filtering Capacitors:** To smooth out ripples from the power source. * **Protection Diodes:** To prevent damage from accidental reverse-polarity connection on the power pins. #### 4. Signal Conditioning (Resistor Network) The device uses high-precision, low-drift metal film resistors to define the input voltage range. These resistors ensure that the "counts" displayed on the LED correspond accurately to the millivolts or volts being measured. --- ### ### Pinout Configuration The back of the unit features a 12-pin dual-in-line (DIP) arrangement. ```markdown Pin 1: +5V Supply Pin 2: 5V Return (Ground) Pin 3: Input Low (Negative side of signal) Pin 4: Input High (Positive side of signal) Pin 11: Decimal Point Select (DP1) Pin 12: Decimal Point Select (DP2) ``` --- ### ### Part Number Breakdown * **DMS-30:** Series Name (3.5 Digit Meter) * **DR:** Digital Readout * **0:** 5V Power Supply requirement * **R:** Red LED Color * **C:** RoHS Compliant (Lead-Free)