FNIRSI SFD-02 Smart Air Quality Monitor

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1- Key Product Features Dual-purpose tester: Combined functionality as a digital tweezer and Kelvin clip measurement bridge. Wide frequency range: Supports frequencies from 100 Hz to 100 kHz for precise impedance analysis. Kelvin accuracy: Utilizes a four-wire system to eliminate cable and tweezer tip errors in sensitive measurements. Rotatable HD display: 1.47-inch screen with 180-degree auto-rotation for ease of use. Smart detection: Automatic identification of component type (R/L/C) and display of ESR, D, and Q parameters. Test safety: Voltage measurement capability up to 30 volts and protection against electrical loads on components. 2- Brief Product Description The FNIRSI LCR-ST2 is a professional, pocket-sized LCR meter designed to enhance accuracy and speed in testing SMD and through-hole components. With a test frequency up to 100 kHz, it enables measurement of critical parameters such as capacitors' Equivalent Series Resistance (ESR), which is crucial for power supply technicians and frequency board repair. Its modular design allows users to switch between tweezer mode (for tiny SMD components) and Kelvin clip mode (for larger components). The high-quality color display and smart component sorting by tolerance make the LCR-ST2 an efficient tool for laboratory, repair, and quality control environments. 3- Technical Specifications Table General Specifications (Model Parameters): Parameter Value Parameter Value Model LCR-ST2 Standby Time About 3 hours Display 1.47 inch HD Dimensions 31 170.7 20.3 mm Weight About 60.8 grams Charging Interface Type-C Operating Temperature 0 to 50 °C Storage Temperature -20 to 60 °C Inductance Measurement Accuracy: Inductance Range 100Hz / 120Hz 1kHz 10kHz 100kHz 1H - 10H ±5% ± 3 digits ±5% ± 3 digits / / 1mH - 1H ±2% ± 3 digits ±2% ± 3 digits / / 10µH - 1mH ±2% ± 3 digits ±0.5% ± 3 digits ±0.5% ± 3 digits ±5% ± 3 digits 1µH - 10µH / ±2% ± 3 digits ±2% ± 3 digits ±5% ± 3 digits Resistance Measurement Accuracy: Resistance Range 100Hz / 120Hz 1kHz 10kHz 100kHz 1MΩ - 10MΩ ±5% ± 3 digits ±5% ± 3 digits / / 1kΩ - 1MΩ ±1% ± 3 digits ±0.5% ± 3 digits ±1% ± 3 digits / 1Ω - 1kΩ ±1% ± 3 digits ±0.5% ± 3 digits ±1% ± 3 digits ±5% ± 3 digits 10mΩ - 1Ω ±2% ± 3 digits ±2% ± 3 digits ±2% ± 3 digits ±5% ± 3 digits Diode and Voltage Test: Feature Value / Range Diode On-state voltage ≤ 0.7 V Voltage ±30 V 4- Full Product Introduction The FNIRSI LCR-ST2 acts as a digital electronic bridge, going beyond a typical multimeter by delivering benchtop-grade accuracy in a portable tester size. Price and Purchase of FNIRSI LCR-ST2 Tester In the measurement equipment market, the price of the LCR-ST2 is set based on its 100 kHz frequency capability, making it very cost-effective compared to similar brands. For those looking to buy the LCR-ST2, this device is not just a digital tweezer but a complete solution for capacitor ESR testing and inductance quality assessment in communication circuits. It is an excellent replacement for old handheld testers that have low accuracy in small ranges (picofarads and microhenries). ESR Parameter Analysis and Frequency Analysis The most important feature of this device is its ability to measure Equivalent Series Resistance (ESR). Using 100 kHz frequency, technicians can identify dried or worn capacitors without fully removing them from the circuit (if no interfering parallel paths exist). Displaying D (dissipation factor) and Q (quality factor) parameters provides precise information about the quality of inductors and small transformers. Practical Advantages and Limitations Advantages: High accuracy of 0.5%, ergonomic magnetic design, software update capability, and complete accessories (Kelvin clip and spare tips). Limitations: The diode test is optimized for standard diodes (up to 0.7 V); for high voltage drop diodes or high voltage Zener diodes, complementary testers like the LCR-P1 should be used. 5- Target Customers Mobile and tablet repair specialists: For troubleshooting SMD components on dense boards. Switching system designers: To measure output capacitor ESR and ripple current. QC and quality control units: For sorting components based on specified tolerance percentages. Telecommunications engineers: For high-precision testing of inductors and frequency filters. Electronic board assemblers: To ensure component values are correct before placement on boards. 6- Frequently Asked Questions (FAQ) What is the purpose of the Kelvin measurement system in this device? This system uses four separate paths to subtract the resistance of connecting wires and tweezer tips from the final result, minimizing errors in very small values (such as resistances below 1 ohm or small inductors). Is the device display suitable for left-handed users? Yes, this model’s display is equipped with an orientation sensor and automatically rotates 180 degrees based on how the device is held. Can the test frequency be manually selected? Yes, you can set the appropriate frequency among 100 Hz, 120 Hz, 1 kHz, 10 kHz, and 100 kHz depending on the component type and application. What is the difference between this model and regular transistor testers? The LCR-ST2 is a specialized measurement bridge for passive components (R/L/C) with much higher accuracy and diverse test frequencies, whereas transistor testers are mainly for identifying semiconductors (MOSFETs, transistors).