The **M2AMS-AD-R/N** is a specific model within the **M2AMS series** of ultra-slim, plug-in signal conditioners (transmitters) manufactured by **M-System**. This particular unit is an **AC Current Transmitter**, designed to convert an alternating current input signal into a standard DC output signal. --- ### 1. Model Code Breakdown Understanding the specific electronic configuration requires decoding the suffix: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **M2AMS** | Model Name | AC Current Transmitter (Average sensing, RMS calibrated) | | **-AD** | Input Type | 0 – 1 A AC (Standard input range) | | **-R** | Power Input | 24V DC (Standard DC power supply) | | **-N** | Output Type | No output (Note: Usually requires a specific output code like 'A', 'V', etc. 'N' may refer to a custom non-specified or Modbus option depending on the regional catalog) | --- ### 2. Key Electronic Specifications The internal circuitry is designed for industrial instrumentation loops where space and accuracy are critical. * **Sensing Method:** Average sensing, RMS calibrated. It calculates the average of the rectified input and scales it to represent the RMS value of a sine wave. * **Input Impedance:** Approximately 0.1 Ω (with a built-in current transformer). * **Isolation:** 4-way isolation (Input – Output – Power – Ground). * **Accuracy:** ±0.3% of span. * **Response Time:** ≤ 0.5 seconds (0 – 90%). --- ### 3. Internal Components & Hardware Features The M2AMS series utilizes high-density surface-mount technology (SMT) to fit within a 5.9 mm wide housing. #### A. Input Stage (Signal Conditioning) The input features a miniature **Current Transformer (CT)**. This provides galvanic isolation and steps down the AC current to a level manageable by the internal operational amplifiers. #### B. Rectification & Filtering Because this is an "Average Sensing" model, it uses a precision full-wave rectifier circuit followed by a low-pass filter to smooth the AC ripple into a steady DC voltage proportional to the input amplitude. #### C. Power Supply Section The "-R" designation indicates a **24V DC switching regulator** circuit. It includes: * Reverse polarity protection. * Surge absorption for industrial transients. #### D. Physical Interface * **Terminal Type:** Tension-clamp (spring) terminals for vibration resistance. * **Housing:** Flame-resistant resin (UL 94V-0). * **Installation:** DIN rail mounting with a power distribution bus option. --- ### 4. Application Wiring Diagram (Simplified) | Terminal No. | Function | Connection | | :--- | :--- | :--- | | **1 - 2** | Input | AC Current Source (0-1A) | | **3 - 4** | Output | DC Signal (e.g., 4-20mA or 0-10V) | | **5 - 6** | Power | 24V DC Supply | ---