1- Key Product Features
Dual-purpose Tester: Combined operation 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 automatic 180-degree 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 Equivalent Series Resistance (ESR) of capacitors, which is vital for power supply technicians and frequency board repairs.
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 sorting of components based on 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
Ready 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 offering bench-level accuracy in a portable tester size.
Price and Purchase of FNIRSI LCR-ST2 Tester
In the measurement equipment market, the price of LCR-ST2 is determined by 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 only a digital tweezer but a complete solution for ESR capacitor testing and quality assessment of inductors 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 a 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 on 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 diagnosing SMD components on dense boards.
Switching system designers: To measure ESR of output capacitors and ripple currents.
QC and quality control units: For sorting components based on specified tolerance percentages.
Telecommunications engineers: For testing inductors and frequency filters with high precision.
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 has an orientation sensor and automatically rotates 180 degrees based on how the device is held.
Can the test frequency be selected manually?
Yes, you can choose between 100 Hz, 120 Hz, 1 kHz, 10 kHz, and 100 kHz frequencies depending on the component type and application.
What is the difference between this model and ordinary 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 used to identify semiconductors (MOSFETs, transistors).
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