The **HAS-01-R** and **HAS-01-Q** (often referred to as the HAS series) are high-precision **Open-Loop Hall Effect Current Sensors**. These components are primarily used to measure DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic control). --- ### 1. Key Technical Specifications Below are the typical electronic characteristics for the HAS-01-R/Q series: | Parameter | Specification | | :--- | :--- | | **Sensor Type** | Open-Loop Hall Effect | | **Primary Nominal Current ($I_{pn}$)** | 50A to 600A (depending on sub-model) | | **Supply Voltage ($V_c$)** | ±15V DC (Dual Supply) | | **Output Voltage ($V_{out}$)** | ±4V at nominal current | | **Accuracy** | ±1% at $25^\circ C$ | | **Linearity** | < ±1% of $I_{pn}$ | | **Response Time** | < 3 $\mu s$ | | **Frequency Bandwidth** | DC to 50 kHz | --- ### 2. Internal Electronic Components The device consists of three main electronic stages: 1. **Magnetic Core:** A high-permeability ring that concentrates the magnetic flux generated by the primary conductor passing through the center. 2. **Hall Cell (Semiconductor):** A thin wafer of semiconductor material placed in the gap of the magnetic core. It generates a small millivolt signal (Hall voltage) proportional to the magnetic field. 3. **Signal Conditioning Circuit:** * **Amplifier:** Increases the tiny Hall voltage to a usable range (typically 0–4V). * **Temperature Compensation:** Resistors and thermistors that stabilize the output against thermal drift. * **Output Buffer:** Ensures low output impedance for interfacing with ADCs or Microcontrollers. --- ### 3. Connection Pinout The sensor typically features a 4-pin connection interface for the secondary circuit: | Pin Number | Symbol | Function | | :---: | :--- | :--- | | 1 | **+V** | Positive Supply Voltage (+15V) | | 2 | **-V** | Negative Supply Voltage (-15V) | | 3 | **M** | Output Signal (Measurement) | | 4 | **0V** | Ground (GND) | --- ### 4. Comparison: R vs. Q Suffix While both belong to the same family, the suffix usually denotes the mechanical mounting or termination style: * **HAS-01-R:** Often refers to a **PCB-mount** version with pins designed for direct soldering onto a circuit board. * **HAS-01-Q:** Often refers to a version with **Faston/Quick-connect** terminals or a specific mounting bracket for chassis installation. --- ### 5. Common Applications * **Variable Speed Drives (VSD):** Monitoring motor current for control loops. * **Uninterruptible Power Supplies (UPS):** Battery charging and load monitoring. * **Welding Machines:** Managing high-current output pulses. * **Solar Inverters:** Measuring string current and DC/AC conversion efficiency.