## Overview of the HAS-45-R The **HAS-45-R** is a high-performance **Hall Effect Current Transducer**. It is primarily used for the electronic 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 primary electronic characteristics of the HAS-45-R: | Parameter | Specification | | :--- | :--- | | **Primary Nominal Current ($I_{pn}$)** | 45 A | | **Primary Current Measuring Range** | ± 135 A | | **Secondary Output Voltage ($V_{out}$)** | ± 4 V (at $I_{pn}$) | | **Supply Voltage ($V_c$)** | ± 15 V (± 5%) | | **Accuracy** | ± 1% of $I_{pn}$ | | **Linearity** | < 1% of $I_{pn}$ | | **Frequency Bandwidth** | DC to 50 kHz | --- ### 2. Internal Electronic Components & Operation The HAS-45-R operates based on the **Open Loop Hall Effect** principle. Its internal structure consists of three main electronic stages: 1. **Magnetic Core:** A high-permeability ring that concentrates the magnetic field generated by the primary current flowing through the center hole. 2. **Hall Effect Generator:** A semiconductor thin film placed in the air gap of the magnetic core. It produces a tiny voltage (Hall voltage) proportional to the magnetic flux. 3. **Signal Conditioning Circuit:** * **Operational Amplifier:** Amplifies the millivolt-level Hall voltage. * **Temperature Compensation:** Internal resistors and circuitry to ensure the output remains stable despite heat generated by high currents. * **Output Buffer:** Provides a low-impedance voltage output ($V_{out}$) for microcontrollers or PLC inputs. --- ### 3. Pinout and Connection Diagram The device typically features a 4-pin Molex-style connector for the secondary side: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | $+V_c$ | Positive Supply (+15V) | | **2** | $-V_c$ | Negative Supply (-15V) | | **3** | $V_{out}$ | Output Signal (± 4V) | | **4** | $0V$ | Ground / Common | --- ### 4. Application Considerations * **Galvanic Isolation:** The HAS-45-R provides high isolation (up to 3kV), meaning the high-voltage primary cable can pass through the sensor without physical electrical contact with the sensing electronics. * **Load Resistance:** The output should be connected to a high-impedance load (typically $> 10 k\Omega$) to maintain accuracy. * **Polarity:** The output voltage is positive when the current flows in the direction of the arrow indicated on the sensor casing. ---