1. Introduction
The FNIRSI LCR-ST1 is a smart bridge tweezer designed for precise measurement of various electronic components, including resistors, capacitors, inductors, diodes, and for continuity testing. It features automatic recognition, multiple test frequencies, and a clear 1.14-inch color display, making it an essential tool for electronic component R&D, circuit board repair, laboratory research, and on-site engineering.
2. Product Features
- Smart Recognition & Auto Measurement: Automatically identifies component type and measures primary and secondary parameters.
- Multiple Test Frequencies: Supports 100Hz, 1kHz, and 10kHz test frequencies.
- Adjustable Test Levels: Offers 0.3V and 0.6V RMS test levels.
- Comprehensive Parameter Display: Shows ESR (Equivalent Series Resistance), D value (Dissipation Factor), Q value (Quality Factor), Z value (Total Impedance), and X value (Reactance).
- High-Definition Display: Equipped with a 1.14-inch HD color screen for intuitive UI and clear data reading.
- Type-C Charging & Data Transfer: Features a Type-C interface for convenient charging and data logging to a PC.
- Replaceable Tweezer Heads: Includes both pointed and hook-shaped gold-plated tips for versatile applications.
- Data Hold & Log: Allows for data retention and automatic recording to Excel for later viewing and export.
- Auto Shutdown: Configurable auto-off timer to conserve battery life.
- Language Switch: Supports Chinese and English languages.
- Magnetic Function: Integrated magnetic patch for stable placement on metallic surfaces.
- Compact and Portable Design: Lightweight and easy to carry for on-the-go work.
3. Package Contents
Please check the package contents upon receipt to ensure all items are present:
- FNIRSI LCR-ST1 Tweezer Meter
- Hook Head (one pair)
- Magnetic Patch
- USB Type-C Data Cable
- User Manual
- Packing Box
- Storage Bag
4. Specifications
| Parameter | Value |
|---|---|
| Product Model | LCR-ST1 |
| Display | 1.14'' Color Screen |
| Charging Interface | USB Type-C, 5V/A |
| Power Supply | 250mAh Lithium Battery (Built-in) |
| Size | 28 × 19 × 150 mm |
| Weight | 41g |
| Operating Temperature | 0 - 50 ℃ |
| Capacitance Range | 1pF - 22mF |
| Inductance Range | 1μH - 10H |
| Resistance Range | 10mΩ - 10MΩ |
| Diode Test | On voltage 0.7V |
| Test Frequencies | 100Hz, 1kHz, 10KHz |
| Test Levels | 0.3V, 0.6V RMS |
| Parameter Display | ESR, D, Q, Z, X |
| Auto Recognition Measurement | Supported |
| Replaceable Tweezer Head | Supported |
| Auto Shutdown | Supported |
| Data Hold | Supported |
| History Record | Connect to PC to view and export |
| Language | Chinese, English |
5. Setup
5.1. Initial Charging
Before first use, fully charge the LCR-ST1 using the provided USB Type-C cable. Connect the cable to the device's Type-C port and a standard 5V/A USB power source. The battery indicator on the display will show charging status.
5.2. Attaching/Replacing Tweezer Heads
The LCR-ST1 comes with interchangeable tweezer heads (pointed and hook). To attach or replace a head:
- Gently unscrew the small knob at the base of the existing tweezer arm.
- Carefully remove the current head.
- Align the desired head (pointed or hook) with the arm and insert it.
- Securely tighten the knob to ensure a firm connection.
5.3. Powering On/Off
- Power On: Press and hold the power button (usually marked with a circle and vertical line) until the display illuminates.
- Power Off: Press and hold the power button again until the display turns off. The device also supports an auto-shutdown feature (see Operating Instructions for configuration).
6. Operating Instructions
6.1. Automatic Recognition Measurement
The LCR-ST1 defaults to automatic recognition mode. Simply touch the component with the tweezer tips, and the device will automatically identify the component type (resistor, capacitor, inductor, diode) and display its relevant parameters.
6.2. Selecting Test Frequency and Level
Use the dial button (sliding wheel) on the side of the device to navigate through the menu options. Press the 'M' button to confirm selections or cycle through modes.
- Test Level: Cycle between 0.3V and 0.6V RMS.
- Test Frequency: Cycle between 100Hz, 1kHz, and 10kHz.
6.3. Data Hold and Logging
- Data Hold: Press the 'H' button (often integrated with the 'M' button or a separate function) to hold the current measurement on the screen.
- Data Logging to PC: Connect the LCR-ST1 to a computer using the Type-C USB cable. The device can automatically generate Excel tables of measurement history, allowing you to view and export data for analysis.
6.4. Menu Navigation
The device menu allows configuration of various settings:
- Language: Switch between Chinese and English.
- Volume: Adjust or mute device sounds.
- Backlight: Adjust backlight brightness or duration.
- AutoOff: Set the auto-shutdown timer (e.g., 5min, 15min, 30min, Off).
7. Maintenance
7.1. Cleaning
Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure the tweezer tips are clean for accurate measurements.
7.2. Storage
Store the LCR-ST1 in its protective storage bag in a cool, dry place away from direct sunlight and extreme temperatures. Remove the tweezer heads if storing for extended periods to prevent damage.
7.3. Battery Care
To prolong the life of the built-in lithium battery, avoid fully discharging it frequently. Recharge the device when the battery indicator is low. If storing for a long time, charge it to about 50% every few months.
7.4. Replacing Tips
The gold-plated tweezer tips are replaceable. If they become worn or damaged, follow the instructions in Section 5.2 to replace them with new ones.
8. Troubleshooting
- Device does not power 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 component is properly isolated if testing in-circuit.
- Display issues: If the display is dim, check backlight settings in the menu. If the display is frozen, try restarting the device.
- Cannot connect to PC: Ensure the Type-C cable is securely connected to both the device and the computer. Check your computer's device manager for proper driver installation (if required).
- Component not recognized: Ensure the component is within the measurable range of the device. Try adjusting the test frequency or level if necessary.
9. User Tips
- For small SMD components, use the pointed tweezer heads for better precision.
- When measuring in-circuit, be aware that other components on the board can affect readings. For most accurate results, test components out-of-circuit.
- Utilize the data logging feature to keep a record of your measurements, especially for batch testing or long-term monitoring.
- The magnetic patch can be very useful for temporarily securing the device to a metal workbench or tool cart, keeping it within easy reach.
- Experiment with different test frequencies (100Hz, 1kHz, 10kHz) as some components may exhibit different characteristics at varying frequencies.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official FNIRSI website or contact your authorized dealer. Keep your purchase receipt as proof of purchase.
