1. Introduction
The FNIRSI LCR-ST1 is a multi-functional and portable tweezer-type LCR tester designed for precise automatic measurements of various electronic components. This device supports testing of resistance, capacitance, inductance, diodes, and continuity. Engineered with advanced measurement technology, it ensures high accuracy and stability, making it an indispensable tool for both experienced engineers and electronics enthusiasts.
Its unique tweezer-shaped design facilitates fine operations in narrow spaces and quick tests of Surface Mount Devices (SMD) and other electronic components. The compact and lightweight nature of the LCR-ST1 makes it highly portable, ideal for on-site engineering and laboratory use.
Figure 1: FNIRSI LCR-ST1 Digital Tweezers LCR Tester highlighting key features.
2. Product Features
- Multi-functional Testing: Supports precise measurements of Resistance, Capacitance, Inductance, Diode, and Continuity.
- Multiple Test Frequencies: Offers 100Hz, 1kHz, and 10kHz test frequencies.
- RMS Test Levels: Features 0.3V and 0.6V RMS test levels for varied applications.
- Comprehensive Parameter Display: Displays D (Dissipation Factor), Q (Quality Factor), X (Reactance), Z (Total Impedance), and ESR (Equivalent Series Resistance) values.
- Smart Recognition: Automatic recognition of electronic components and primary/secondary parameters.
- High-Resolution Display: Equipped with a 1.14-inch HD color screen for clear and intuitive data reading.
- Ergonomic Design: Features an ergonomic measuring arm and gold-plated tweezer tips for comfortable and precise handling.
- Replaceable Tips: Comes with both pointed and hook-type gold-plated tweezer tips for different component sizes and types.
- Data Logging: Supports data hold and log functions, with the ability to connect to a PC via Type-C for viewing and exporting data to Excel.
- Magnetic Adsorption: Integrated magnetic patch allows for stable positioning on metallic surfaces.
- Rechargeable Battery: Built-in 250mAh lithium battery, rechargeable via Type-C USB (5V/A).
- User-Friendly Interface: Intuitive UI with a sliding wheel and silicone buttons for easy navigation.
- Language Options: Supports Chinese and English languages.
- Auto Shutdown: Configurable auto-shutdown feature to conserve battery life.
Figure 2: Replaceable pointed and hook-type gold-plated tweezer tips.
Figure 3: Data logging and PC connectivity via Type-C.
3. Specifications
| Parameter | Value |
|---|---|
| Product Model | LCR-ST1 |
| Display | 1.14" Color Screen |
| Charging Interface | USB Type-C, 5V/A |
| Power Supply | 250mAh Lithium Battery |
| Dimensions | 28 × 19 × 150mm |
| Weight | 41g |
| Accuracy Class | 0.1% |
| DIY Supplies | Electrical |
| Certification | CE |
| Origin | Mainland China |
| Type | Range | 100Hz | 1KHz | 10KHz |
|---|---|---|---|---|
| Capacitance | 1mF-22mF | 5%±3 | 5%±3 | --- |
| 1uF-1mF | 2%±3 | 2%±3 | 2%±3 | |
| 1nF-1uF | 2%±3 | 0.5%±3 | 0.5%±3 | |
| 1pF-1nF | --- | 0.5%±3 | 0.5%±3 | |
| Inductance | 1mH-10H | 5%±3 | 5%±3 | --- |
| 100uH-1mH | 2%±3 | 2%±3 | 2%±3 | |
| 10uH-100uH | 2%±3 | 0.5%±3 | 0.5%±3 | |
| 1uH-10uH | --- | 0.5%±3 | 0.5%±3 | |
| Resistance | 1MΩ-10MΩ | 5%±3 | 5%±3 | --- |
| 1KΩ-1MΩ | 1%±3 | 0.5%±3 | 1%±3 | |
| 1Ω-1KΩ | 2%±3 | 2%±3 | 2%±3 | |
| Diode | On voltage 0.7V | x | x | x |
Figure 4: Detailed product parameters and measurement ranges.
4. Package Contents
Please check the package contents upon receipt to ensure all items are present and in good condition:
- LCR-ST1 Smart Tweezers
- Pointed Head Tweezer Tips (one pair)
- Hook Head Tweezer Tips (one pair)
- Magnetic Patch
- USB Data Cable (Type-C)
- User Manual
Figure 5: Visual representation of the LCR-ST1 package contents.
5. Setup
5.1 Charging the Device
Before initial use, fully charge the LCR-ST1 using the provided USB Type-C cable. Connect the cable to the Type-C port on the device and a standard 5V/A USB power source. The battery indicator on the display will show charging status.
5.2 Attaching/Changing Tweezer Tips
The LCR-ST1 comes with interchangeable pointed and hook-type tweezer tips. To change tips:
- Gently unscrew the small knob located near the base of the existing tips.
- Carefully remove the current tips.
- Align the desired tips (pointed or hook) with the slots.
- Securely fasten the knob to hold the new tips in place.
5.3 Powering On/Off
Press and hold the power button (usually marked with a power symbol) for a few seconds to turn the device on or off.
6. Operating Instructions
6.1 Basic Measurement (Auto Mode)
The LCR-ST1 features an intelligent auto-recognition mode. In this mode, the device automatically identifies the component type (resistance, capacitance, inductance, diode) and selects the appropriate test parameters.
- Ensure the device is powered on.
- Gently clamp the component to be tested between the tweezer tips.
- The device will automatically detect the component and display its measured value along with relevant parameters (e.g., ESR for capacitors).
Figure 6: Examples of component testing in auto mode.
6.2 Manual Mode and Parameter Adjustment
While in auto mode, you can use the sliding wheel or dedicated buttons to manually adjust test parameters such as test level (0.3V/0.6V RMS) and test frequency (100Hz, 1kHz, 10kHz). This allows for more specific testing requirements.
Video 1: Demonstration of LCR-ST1 Tweezer-type LCR Bridge features and operation.
6.3 Understanding Displayed Parameters
- D Value (Dissipation Factor): Indicates the energy loss in a component, particularly relevant for capacitors.
- Q Value (Quality Factor): The inverse of the dissipation factor, indicating the quality of a reactive component (inductor or capacitor).
- ESR (Equivalent Series Resistance): The effective resistance in series with a capacitor, crucial for assessing capacitor health.
- X (Reactance): The opposition to current flow in an AC circuit due due to inductance or capacitance.
- Z (Total Impedance): The total opposition to current flow in an AC circuit, combining resistance and reactance.
6.4 Data Hold and Export
The device supports data hold, allowing you to freeze the current measurement on the screen. For long-term analysis, connect the LCR-ST1 to a PC using the Type-C USB cable. The device can automatically record measurement history and export it as an Excel file for detailed review.
6.5 Menu Navigation
Access the device menu to adjust settings such as language (Chinese/English), volume, backlight brightness, and auto-off timer (5min, 15min, 30min). You can also view device information (e.g., firmware version) and restore factory settings from the menu.
7. Maintenance
- Cleaning: Regularly clean the tweezer tips and the device body with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Storage: Store the LCR-ST1 in its protective case in a dry, cool environment away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. If storing for an extended period, charge the battery to about 50% and recharge every few months.
- Tip Replacement: If the gold-plated tips show signs of wear or damage, replace them with new ones to maintain measurement accuracy.
8. Troubleshooting
- Device not turning on: Ensure the battery is charged. Connect to a Type-C charger and try again.
- Inaccurate readings: Check if the tweezer tips are clean and making good contact with the component. Ensure the correct test frequency and level are selected for the component type.
- Display issues: If the display is dim or unresponsive, try adjusting the backlight setting in the menu or recharging the device.
- Data export problems: Ensure the Type-C cable is securely connected to both the device and the PC. Check PC drivers if necessary.
9. User Tips
- For very small SMD components, use the pointed tips for better contact and precision.
- When testing components on a circuit board, ensure the circuit is powered off and any capacitors are discharged to prevent damage to the tester or the circuit.
- Utilize the data logging feature for batch testing or when analyzing component behavior over time.
- Experiment with different test frequencies (100Hz, 1kHz, 10kHz) to get a more complete picture of a component's characteristics, especially for reactive components like capacitors and inductors.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact information provided with your purchase or visit the official FNIRSI website. Keep your proof of purchase for warranty claims.
