The **HAS-H2-R** is a high-precision, industrial-grade current sensor manufactured by **LEM**. It is designed based on the **Hall Effect** principle and is primarily used for measuring DC, AC, and pulsed currents with galvanic isolation between the primary (high power) and secondary (electronic) circuits. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Primary Nominal Current ($I_{pn}$)** | 2 A | | **Measuring Range** | 0 to ±6 A | | **Supply Voltage ($V_c$)** | ±15 V (±5%) | | **Output Type** | Analog Voltage ($±4 V$ at $I_{pn}$) | | **Accuracy** | ±1% of $I_{pn}$ (at $25°C$) | | **Response Time** | < 3 µs | | **Frequency Bandwidth** | DC to 50 kHz | --- ### 2. Internal Electronic Components & Architecture The HAS-H2-R operates using an **Open Loop** Hall Effect configuration. Its internal structure consists of the following electronic stages: 1. **Magnetic Core:** A soft magnetic ring that concentrates the magnetic field generated by the current-carrying conductor passing through the sensor's center. 2. **Hall Generator:** A semiconductor thin-film element placed in the air gap of the magnetic core. It generates a small voltage (Hall Voltage) proportional to the magnetic flux. 3. **Signal Conditioning Circuitry:** * **Operational Amplifiers:** Amplify the millivolt-level Hall voltage to a usable standard output range (0-4V). * **Compensation Resistors:** Integrated to minimize offset drift caused by temperature changes. 4. **Galvanic Isolation:** The design ensures there is no electrical connection between the power circuit being measured and the measurement electronics, protecting the control system. --- ### 3. Pin Configuration The device typically features a 4-pin connection interface: * **Pin 1:** Positive Supply Voltage ($+15 V$) * **Pin 2:** Negative Supply Voltage ($-15 V$) * **Pin 3:** Output Signal ($V_{out}$) * **Pin 4:** 0V (Reference Ground) --- ### 4. Typical Applications * **Variable Speed Drives:** Monitoring motor current for precise control. * **Uninterruptible Power Supplies (UPS):** Managing battery charging and load distribution. * **Switched Mode Power Supplies (SMPS):** Current regulation and overcurrent protection. * **Photovoltaic Systems:** Measuring DC output from solar strings. ---