The **M2VF2-BE-R/CE** is a high-performance, signal-conditioning transducer manufactured by **M-System**. It is specifically designed as a **Variable Low-pass Filter** (VLF) module. Its primary electronic function is to accept a DC signal, filter out high-frequency noise or rapid fluctuations, and provide a stabilized DC output. --- ## 1. Core Technical Specifications The electronics of this unit are built to industrial instrumentation standards. Below are the primary electronic parameters: | Feature | Specification | | :--- | :--- | | **Model Function** | Variable Low-pass Filter (VLF) | | **Input Signal** | 0 – 10V DC, 1 – 5V DC, 4 – 20mA DC (Depends on sub-code) | | **Output Signal** | 0 – 10V DC, 4 – 20mA DC (Isolated) | | **Time Constant Range** | Adjustable (Standard range typically 0.5 to 30 seconds) | | **Power Input** | 100 – 240V AC (represented by the 'M2' series base) | | **Accuracy** | ±0.1% of span | | **Isolation** | 3-way (Input to Output to Power) | --- ## 2. Electronic Component Blocks The internal circuitry is divided into three main functional stages: ### A. Input Stage (Signal Conditioning) * **Current-to-Voltage Conversion:** If the input is 4-20mA, internal precision resistors convert the current into a voltage signal for processing. * **Surge Protection:** Includes Zener diodes or varistors to protect against voltage spikes on the input line. ### B. The Filter Network (The "VLF" Core) * **Active RC Filter:** The "Variable" part of the name comes from a potentiometer-adjustable RC (Resistor-Capacitor) network. * **Time Constant Control:** The electronic circuit uses an operational amplifier (Op-Amp) in an integrator configuration. By turning the front-panel trimmer, you change the resistance in the RC circuit, thereby increasing or decreasing the "damping" effect on the signal. * **Purpose:** It smoothens signals from sensors that might be jittery (e.g., a flow meter in a turbulent pipe or a weighing scale subject to vibration). ### C. Output & Isolation Stage * **Optical Isolation:** Uses photocouplers to transfer the filtered signal across a galvanic barrier, preventing ground loops. * **Power Supply:** An internal switching regulator converts the AC input power into stable DC rails for the internal Op-Amps. --- ## 3. Terminal Connection Map The M2VF2 series typically uses a M3 screw terminal base. | Terminal No. | Description | Function | | :--- | :--- | :--- | | **1** | Output (+) | Positive DC Output | | **2** | Output (-) | Negative DC Output | | **3** | Input (+) | Positive DC Input | | **4** | Input (-) | Negative DC Input | | **5** | Power (L) | AC Power Line | | **6** | Power (N) | AC Power Neutral | --- ## 4. Operational Summary The **"R/CE"** suffix indicates specific regional or compliance certifications: * **R:** Usually denotes specific response characteristics or specialized hardware revisions. * **CE:** Confirms the electronics comply with European Union safety, health, and environmental protection requirements (EMC Directive).