The **HAS-D5-R** is a high-performance **Magnetic Hall Effect Sensor** manufactured by **LEM**. It is primarily used for the non-intrusive measurement of DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic interface). ### 1. Key Technical Specifications The following table summarizes the core electronic characteristics of the HAS-D5-R: | Parameter | Specification | | :--- | :--- | | **Primary Nominal Current ($I_{pn}$)** | 5 A | | **Measuring Range ($I_{pm}$)** | ±15 A | | **Secondary Output Voltage ($V_{out}$)** | ±4 V (at $I_{pn}$) | | **Supply Voltage ($V_c$)** | ±15 V (±5%) | | **Accuracy** | ±1% of $I_{pn}$ | | **Linearity Error** | < 1% of $I_{pn}$ | | **Frequency Bandwidth** | DC to 50 kHz (-3dB) | | **Response Time** | < 3 µs | --- ### 2. Operating Principle: Open Loop Hall Effect The HAS-D5-R operates on the **Open Loop** principle. This involves several internal electronic stages: 1. **Magnetic Core:** Concentrates the magnetic flux generated by the primary current. 2. **Hall Cell:** Positioned in the air gap of the core. It generates a small voltage (Hall Voltage) proportional to the magnetic flux. 3. **Amplifier Stage:** Since the Hall voltage is very weak, internal circuitry amplifies it to provide a usable ±4 V signal. 4. **Galvanic Isolation:** There is no electrical connection between the wire being measured and the sensor output, ensuring safety and protecting sensitive microcontrollers. --- ### 3. Connection Interface The device typically features a 4-pin configuration for integration into a PCB or electronic system: | Pin Number | Function | Description | | :---: | :--- | :--- | | **1** | **+Vc** | Positive Supply (+15V) | | **2** | **-Vc** | Negative Supply (-15V) | | **3** | **Output** | Analog Output Signal (±4V proportional to current) | | **4** | **0V** | Ground / Common Reference | --- ### 4. Electronic Advantages * **Low Power Consumption:** Extremely efficient for continuous monitoring. * **High Insulating Voltage:** Provides safety in high-voltage environments. * **Broad Frequency Range:** Capable of measuring both steady-state DC and high-speed switching AC currents. * **Low Insertion Loss:** Since it uses magnetic induction, it does not add resistance to the primary circuit. ---