Sensor selection criteria: Accuracy + Thermal Drift + Isolation (Source: Magtron). Golden Rule: Total error <0.5% (Source: Littelfuse). Core Spec: Thermal drift ±0.2mA (Source: CHIPSENSE). Key Consideration: Isolation safety (Source: Rongtech).
I.
Measurement Principles
Hall Effect: Open-loop Hall measurement (Source: Acrel); Shunt: Low-resistance shunt sampling (Source: Melexis); Fluxgate: High-precision fluxgate (Source: Qiho); Closed-loop: Closed-loop compensation coil (Source: Qiho); Comparison: Hall vs. Shunt complementarity (Source: Melexis)—Principles: Hall + Shunt + Fluxgate (three technologies).
II.
Accuracy Specifications
0.5%: Total error <0.5% (Source: Littelfuse); 0.1%: Linearity ±0.05–0.1% (Source: Douyin); Class 0.5: Hall voltage Class 0.5 (Source: Douyin); Measurement Range: 5%–300% of rated value (Source: Douyin); Example Calculation: ±1500A Fluxgate (Source: Littelfuse)—Accuracy: 0.5% + 0.1% + Linearity (three metrics).
III. Temperature Drift Control
Temperature Range: -40 to 85°C operation (Source: CHIPSENSE); Offset: Offset temperature drift ±0.2mA (Source: CHIPSENSE); Maximum: Max ±0.5mA (Source: CHIPSENSE); Compensation: NTC isotherm compensation (Source: CHIPSENSE); Zero Point: Zero-point temperature drift ±2mV (Source: GC1860)—Temperature Drift: ±0.2mA + compensation + zero point (three parameters).
IV.
Isolation Capability
Isolation: High-voltage side/low-voltage side isolation (Source: Rongtech); Voltage: Isolation voltage verification (Source: Rongtech); Creepage: Creepage distance and clearance (Source: Rongtech); Insulation: Insulation requirements (Source: Rongtech); Hall: Hall isolation technology (Source: Douyin)—Isolation: Voltage + creepage + insulation (three requirements).
V.
Response Speed
Milliseconds: Millisecond-level fault response (Source: Douyin); 5µs: Response time ≤5µs (Source: Acrel); Sub-µs: Sub-microsecond response (Source: Douyin); Bandwidth: 500kHz bandwidth (Source: Douyin); 20kHz: Frequency range 0–20kHz (Source: Acrel)—Response: 5µs + 500kHz + frequency range (three indicators).
VI. Temperature Sensing
NTC: NTC thermistor (Source: MCNIC); Response: 1–5 seconds (Source: xx-sensor); Quantity: 15–30 distributed units (Source: xx-sensor); B-value: 3435–4200K (Source: Douyin); IP67: IP67-rated sealing across the entire series (Source: Douyin)—Temperature: NTC + Response + Distribution (three key points).
VII.
Procurement Recommendations
First, determine the operating principle (Hall effect/fluxgate); second, verify accuracy (<0.5%); third, check temperature drift (across the full temperature range); fourth, evaluate isolation (creepage distance);
fifth, measure response time (millisecond level)—Sensors: Accuracy + Temperature Drift + Isolation (three core factors).
