The **M2VT-A11-R2/K** is a high-precision, plug-in type signal conditioner (transmitter) manufactured by **M-System** (now part of MG CO., LTD.). It is specifically designed to convert a V-Network (potentiometer) input into a standard DC output signal. Below is a breakdown of its electronic specifications and technical features. --- ### 1. General Specifications The model number can be decoded as follows: * **M2VT:** Series identifier (Mini-M Series V-Network Transmitter). * **A:** Input Type (Potentiometer). * **1:** Output Type (4–20 mA DC). * **1:** Power Input (24V DC). * **R2:** Design/Version code. * **K:** High-speed response option (optional). ### 2. Technical Data Table | Feature | Specification | | :--- | :--- | | **Input Signal** | Potentiometer (100 $\Omega$ to 10 k$\Omega$) | | **Output Signal** | 4 – 20 mA DC (Load resistance max. 550 $\Omega$) | | **Power Supply** | 24V DC ($\pm$10%, ripple 10% p-p max) | | **Accuracy** | $\pm$0.1% of span | | **Temp. Coefficient** | $\pm$0.015% / °C | | **Response Time** | Approx. 25 ms (0 to 90%) | | **Isolation** | Input to Output to Power | | **Housing Material** | Flame-resistant resin (Black) | --- ### 3. Electronic Components & Internal Functionality The device operates using several key electronic stages: #### A. Input Circuit (Potentiometer Interface) * **Excitation Voltage:** The unit provides a constant voltage (typically around 0.5V DC) to the potentiometer. * **Reference Bridge:** It measures the ratio of the wiper position rather than absolute resistance, which compensates for lead wire resistance and temperature shifts. #### B. Signal Conditioning Stage * **Zero/Span Adjustment:** Accessible via the front panel. These potentiometers allow fine-tuning of the 0% (Zero) and 100% (Span) points of the output signal. * **Isolation Transformer:** Uses an internal high-frequency transformer to provide galvanic isolation (2000V AC) between the input, output, and power supply. This prevents ground loops and protects sensitive PLC/DCS inputs. #### C. Output Drive Stage * **Current Loop Driver:** Converts the processed signal into a regulated 4-20mA current. It is designed to maintain accuracy even if the load resistance fluctuates (up to 550 $\Omega$). --- ### 4. Wiring Diagram Representation The unit uses a standard 8-pin socket base. | Pin No. | Connection | Description | | :---: | :--- | :--- | | **1** | Output (+) | 4-20mA Signal | | **2** | Output (-) | Signal Ground | | **3** | Input (1) | Potentiometer High | | **4** | Input (2) | Potentiometer Wiper | | **5** | Input (3) | Potentiometer Low | | **7** | Power (U) | +24V DC | | **8** | Power (V) | 0V DC | ---