The **M2VT-AB-R/N** is a specific model within the **M2VT Series** of thin-profile, plug-in signal conditioners manufactured by **M-System** (now MG CO., LTD.). This device is an **AC Voltage Transmitter**, used to convert an AC voltage input into a standardized DC output signal. --- ### 1. Model Code Breakdown Understanding the specific suffixes helps identify the electronic characteristics of this unit: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **M2VT** | Model Name | AC Voltage Transmitter (RMS sensing) | | **A** | Input Range | 0 – 100V AC | | **B** | Output Range | 2 – 10V DC | | **R** | Power Input | 24V DC | | **N** | Options | None (Standard) | --- ### 2. Key Electronic Specifications The internal circuitry is designed for industrial environments requiring high isolation and precision. * **Sensing Method:** RMS (Root Mean Square) sensing. This allows the device to accurately measure distorted waveforms, not just pure sine waves. * **Input Impedance:** Typically $\ge 1 M\Omega$. * **Response Time:** $\le 0.5$ seconds (0 – 90%). * **Isolation:** 4-way isolation (Input to Output to Power to Ground). * **Accuracy:** $\pm 0.3\%$ of span. --- ### 3. Connection Diagram (General) The M2VT uses a base socket (M2-type) for easy maintenance. | Terminal | Function | | :--- | :--- | | **1 & 2** | AC Voltage Input (0-100V) | | **4 & 5** | DC Output (2-10V) | | **7 & 8** | Power Supply (24V DC) | | **Base Pin** | Ground (GND) | --- ### 4. Hardware Construction The device consists of three main electronic stages: 1. **Input Conditioning:** Uses a potential transformer or high-impedance divider to scale the 100V AC signal down to a safe internal voltage. 2. **True RMS Converter:** An integrated circuit converts the AC waveform into a proportional DC level based on the energy content (RMS). 3. **Output Amplifier:** Scales the signal to the required 2-10V DC range and provides the necessary current drive for downstream controllers (like a PLC or DCS). ---