HJMAG803C current-type three-axis high-precision weak magnetic measurement module

　　Note 1: The HMR2300 software control uses a non-isolated RS-232/RS-485 interface chip which is susceptible to common/differential mode interference from remote ground lines leading to errors; severe cases may damage its transceiver. Customers need to authenticate internal software compatibility during use. In contrast, HJMAG803C requires no programming internally; it outputs a current signal of 1~9mA which makes it more convenient compared to HMR2300 that requires internal programming while offering features like long line output capability with high SNR and precision.

　　Note 2: Due to material magnetism affecting connectors for ensuring measurement accuracy of the magnetic sensor; HMR2300's sensitive axis area is located on the right side of its shell while HJMAG803C uses non-magnetic materials for connectors with its sensitive axis area positioned at the geometric center of its shell.

　　03 Electrical Principle Block Diagram

04 Packaging Form and Lead Functionality

　　1. Packaging Form: Uses non-magnetic metal packaging with dimensions shown in figure (unit: mm).

Note: Shell dimensions: L*W*H=72.5*30*17mm; installation reference surface has been polished.

2. Lead Functionality

除非另有说明，VCC=15±5%V，T_A=25℃。

2.The orientation of three orthogonal axes on this module can be seen in below diagram (top view).

　　3.Screws on four through holes (Φ2) should use non-magnetic screws for securing components.

　　4.As current generates magnetic fields care should be taken during layout design to avoid placing unidirectional large current lines close together so as not produce noise/drift at zero point; if distance cannot be increased then power supply lines should be arranged equidistantly along with return lines (i.e., GND), preferably twisted pairs if possible since this arrangement helps cancel out mutual fields generated by currents.

　　5.Although this module can reliably operate in environments where TA≥175℃ due limitations imposed by AD590's measuring range temperatures above125℃ cannot utilize internal temperature sensors for calibration purposes.

　　6.Due differences among various equipment assembly environments surrounding hard/soft magnetic interferences will ultimately cause variations in zero point(K0)and scale factor(K1)of three-axis outputs hence users are advised perform modeling corrections within their upper computer systems.

　　7.Place modules inside a magnetic shielding barrel or wrap them using permalloy materials then measure currents at long line endpoints; if reading shows5mA connection is normal otherwise first check if wiring has broken.

　　8.To improve system acquisition SNR customers are advised make nearby ground reference signals;

　　10. If used for aircraft geomagnetic navigation, the following work must be done:

　　A. The geographic North Pole of the Earth and the geomagnetic North Pole are not at the same point, so modeling correction is required;

　　B. Modeling correction must be performed for longitude; otherwise, the error during long-distance flight will be significant;

　　C. It must be integrated with a three-axis accelerometer to complete modeling corrections for the aircraft's pitch and roll angles;

　　D. For detailed principles and implementation, please refer to Honeywell's application article "Applications of Magnetoresistive Sensors in Navigation Systems."

　　11. The back of the module is the installation reference surface, which has been specially polished, so it must not be damaged.

　　10 Related Products

　　1. HJMAG803 three-axis high-precision weak magnetic measurement module

　　2. HJMAG803A high-temperature three-axis high-precision weak magnetic measurement module

　　3. HJMAG804 dual-axis high-precision weak magnetic measurement module

　　4. HJMAG805A high-precision geomagnetic reference speed measurement module

　　5. HJMAG805B high-precision geomagnetic reference speed measurement module