The **HAS-52-R** is a specific model within the **HAS Series** of open-loop current sensors manufactured by **LEM**. These devices are designed to measure DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic measurement). --- ### 1. Key Technical Specifications The following table highlights the primary electronic characteristics of the HAS-52-R: | Parameter | Value / Specification | | :--- | :--- | | **Primary Nominal Current ($I_{pn}$)** | 50 A | | **Measuring Range ($I_{pm}$)** | ± 150 A (at $V_c$ = ± 15 V) | | **Secondary Output Voltage** | ± 4 V (at $I_{pn}$) | | **Supply Voltage ($V_c$)** | ± 15 V (± 5%) | | **Accuracy** | ± 1% of $I_{pn}$ (at $+25^{\circ}C$) | | **Frequency Bandwidth** | DC to 50 kHz (-3 dB) | | **Response Time** | < 3 µs | | **Isolation Voltage** | 3 kV | --- ### 2. Electronic Components & Operating Principle The HAS-52-R operates based on the **Hall Effect** principle using an open-loop architecture. #### Internal Components: * **Magnetic Core:** A high-permeability ring that concentrates the magnetic flux generated by the primary current. * **Hall Effect Generator:** A semiconductor sensor placed in the air gap of the magnetic core. It produces a small voltage proportional to the magnetic flux. * **Signal Conditioning Circuit:** An internal operational amplifier that scales the tiny Hall voltage into a usable 4V output signal. #### Operational Logic: 1. **Current Input:** The primary wire passes through the center hole of the sensor. 2. **Flux Detection:** The magnetic field is concentrated in the core. 3. **Conversion:** The Hall sensor converts the field into a voltage. 4. **Output:** The secondary electronics output a voltage that is a linear representation of the primary current. --- ### 3. Pin Configuration and Connection The device typically features 4 pins for integration into a PCB: | Pin Number | Function | Description | | :---: | :--- | :--- | | **1** | +Vc | Positive Supply (+15V) | | **2** | -Vc | Negative Supply (-15V) | | **3** | Output | Voltage signal proportional to current | | **4** | 0V | Common Ground / Reference | --- ### 4. Application Use Cases Because the HAS-52-R provides galvanic isolation, it is commonly used in: * **Variable Speed Drives:** Monitoring motor current. * **Uninterruptible Power Supplies (UPS):** Managing battery charging and load. * **Switched Mode Power Supplies (SMPS):** Current regulation. * **Welding Machines:** Precision control of high-output currents.