The **HAS-H1-R** is a specific type of open-loop Hall effect current sensor. It is widely used for the non-contact measurement of DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic control). --- ## 1. Technical Specifications Below is a summary of the core electronic characteristics typically found in the HAS series (specifically the H1-R variants): | Parameter | Value / Range | | :--- | :--- | | **Primary Nominal Current ($I_{pn}$)** | 50A to 600A (Model dependent) | | **Supply Voltage ($V_c$)** | ±15V (Typical ±5%) | | **Output Signal** | ±4V at Nominal Current | | **Accuracy** | ±1% of $I_{pn}$ at 25°C | | **Linearity** | < ±1% of $I_{pn}$ | | **Frequency Bandwidth** | DC to 50 kHz (-3dB) | | **Operating Temperature** | -10°C to +80°C | --- ## 2. Internal Electronic Components The sensor functions through a combination of magnetic and semiconductor elements: ### A. Magnetic Core A ring-shaped (toroidal) magnetic core surrounds the primary conductor. Its purpose is to concentrate the magnetic flux generated by the current flowing through the wire into a specific air gap. ### B. Hall Effect Generator Located within the air gap of the magnetic core, this semiconductor thin-film senses the magnetic flux density ($B$). When current flows through the Hall element in the presence of a magnetic field, it generates a small "Hall voltage" ($V_h$) perpendicular to both. ### C. Signal Conditioning Circuitry Because the raw Hall voltage is very weak and sensitive to temperature, the internal PCB contains: * **Operational Amplifiers:** To boost the millivolt-level Hall signal to the standard 4V output. * **Temperature Compensation:** Resistors and thermistors that offset the drift caused by thermal changes in the Hall element. * **Voltage Regulator:** Ensures internal components receive stable power despite fluctuations in the ±15V rails. --- ## 3. Connection Pinout The HAS-H1-R typically utilizes a 4-pin interface for its electronics: 1. **+Vc:** Positive Supply (+15V) 2. **-Vc:** Negative Supply (-15V) 3. **Output:** Analog signal (proportional to measured current) 4. **0V:** Common Ground --- ## 4. Key Advantages * **Galvanic Isolation:** The electronic measurement circuit is physically separated from the high-voltage primary line, protecting low-voltage microcontrollers (like Arduino/PLCs). * **Low Insertion Loss:** Since the sensor only surrounds the wire, it does not add resistance to the primary circuit. * **High Sensitivity:** Capable of detecting fast transients in motor drives and UPS systems. ---