FNIRSI LCR-ST1 Intelligent Bridge Tweezers User Manual

This manual provides detailed instructions on the usage, precautions, and related matters for the FNIRSI LCR-ST1 Intelligent Bridge Tweezers. Please read carefully before use to ensure optimal performance.

1. Product Overview

The LCR-ST1 is a newly developed tweezer-type LCR bridge by FNIRSI. It is a multifunctional, portable testing instrument that supports precise measurement of resistance, capacitance, inductance, and diodes. Utilizing advanced measurement technology, it ensures high accuracy and stability. The device features a 1.14-inch color screen display, magnetic suction functionality for enhanced usability, and a built-in 250mAh lithium battery for extended use. It supports measurement frequencies of 100 Hz, 1 kHz, and 10 kHz. The unique tweezer-type design is ideal for fine operations in confined spaces and quick testing of electronic components, making it an essential tool for field engineers and laboratories.

2. Panel Introduction

The LCR-ST1 features the following components:

Testing Probes: The probes at the tip of the tweezers used for component measurement.
Screen: Displays measurement results, settings, and status information.
Dial Button (Ω): Used for scrolling through options and adjusting values.
Confirm/Exit Button (⇦): Used to confirm selections or enter/exit menus.
Power Button (Ⓟ): Used to turn the device on or off.
Charging Indicator Light: Indicates charging status.
Type-C Charging/Data Transfer Port: For charging the battery and transferring data.

Button Operations:

Button	Operation	Interface	Function
(1) Power Button (Ⓟ)	Short Press	/	Power On
		Main Interface	Reset (Zeroing)
	Long Press	/	Power Off
(2) Dial Button (Ω)	Short Press	Main Interface	Hold Data
	Long Press	/	Enter/Exit Settings
(Dial Button Ω)	Scroll left/right	Main Interface	Adjust numerical values left/right
		Settings Interface	Select options up/down
(Confirm/Exit Button ⇦)	Short Press	Main Interface	Select to adjust test level/frequency
		Settings Interface	Confirm/exit selection
	Long Press	/	Switch DQZX of secondary parameters

3. Parameter Introduction

General Specifications:

Product Model	LCR-ST1	Screen	1.14 inch
Size	28 x 19 x 150 mm	Power Supply Voltage	250 mAh rechargeable lithium battery
Weight	41 g	Charging Specifications	USB Type-C, 5V/1A

Measurement Accuracy:

Type	Range	100 Hz	1 KHz	10 KHz
Capacitance	1 mF - 22 mF	5% reading ± 3	5% reading ± 3	---
	1 uF - 1 mF	2% reading ± 3	2% reading ± 3	2% reading ± 3
	1 nF - 1 uF	2% reading ± 3	0.5% reading ± 3	0.5% reading ± 3
	1 pF - 1 nF	---	2% reading ± 3	2% reading ± 3
Diode	Forward voltage drop less than 0.7 V
Inductance	1 H - 10 H	5% reading ± 3	5% reading ± 3	---
	1 mH - 1 H	2% reading ± 3	2% reading ± 3	2% reading ± 3
	10 uH - 1 mH	2% reading ± 3	0.5% reading ± 3	0.5% reading ± 3
	1 uH - 10 uH	---	---	2% reading ± 3
Resistance	1 MΩ - 10 MΩ	5% reading ± 3	5% reading ± 3	---
	1 KΩ - 1 MΩ	1% reading ± 3	0.5% reading ± 3	1% reading ± 3
	1 Ω - 1 KΩ	1% reading ± 3	0.5% reading ± 3	0.5% reading ± 3
	10 mΩ - 1 Ω	2% reading ± 3	2% reading ± 3	2% reading ± 3

4. Operation Instructions

4.1 Interface Introduction

The main interface displays the following information:

Test range: Indicates the type of measurement (e.g., Resistance, Capacitance).
Test voltage/frequency: Shows the current test voltage and frequency settings.
Battery level: Displays the remaining battery charge.
Measurement parameters: Shows the primary measured value (e.g., resistance value).
Data hold: Indicates if the current measurement is being held.
Units: Displays the units of the measured value (e.g., kΩ, mF).
Auxiliary measurement parameters: Shows secondary parameters like Rs or Q factor.

4.2 Installation Instructions for Test Probe

Align the test probe with the mounting hole on the measuring arm. Ensure the serrated side of the test probe faces the inner side of the tweezers.
Insert the test probe into the measuring arm.
Rotate the screw to tighten and secure the test probe.

Removal is performed in the reverse order. The measuring arm is not detachable.

4.3 Operation Instructions

Power On/Off: Short press the Power Button (Ⓟ) to power on. Long press the Power Button (Ⓟ) to power off. Upon powering on, use the Dial Button (Ω) to select the language (Chinese or English) and press the Confirm/Exit Button (⇦) to confirm.
Main Parameter Selection: Use the Dial Button (Ω) to scroll left or right to switch between automatic measurement, resistance, capacitance, inductance, and diode measurement modes.
Test Voltage Level Selection: Press the Confirm/Exit Button (⇦) to switch to the voltage level selection area. Then, use the Dial Button (Ω) to scroll left or right to select between 0.3V and 0.6V test voltages.
Test Frequency Selection: Press the Confirm/Exit Button (⇦) to switch to the frequency selection area. Then, use the Dial Button (Ω) to scroll left or right to select between 100 Hz, 1 kHz, and 10 kHz test frequencies.

Note on Frequency: LCR meters use AC test signals for impedance measurement. Frequency is a key parameter. Different test frequencies may yield different measurement results for the same component due to non-idealities and distributed parameters.

Short Circuit Zeroing: Select the desired test frequency. Insert a short-circuit piece into the test socket (or short the test terminals if using SMD test tweezers or clips). Short press the Power Button (Ⓟ) to enter zeroing mode. The instrument will automatically perform zeroing after identification.
Data Hold: Short press the Dial Button (Ω) to hold the current measurement. The data hold icon [1] will appear on the screen. Data is also automatically saved to an Excel file when connected via USB.
Continuity: In diode mode, if the measured resistance is less than 50 Ω, the continuity function is triggered.
Settings Page: Long press the Dial Button (Ω) to enter system settings. Use the Dial Button (Ω) to navigate between primary and secondary menus. Press the Confirm/Exit Button (⇦) to enter or exit secondary menus. Settings include:
- Language: Switch system display language (Chinese, English).
- Volume: Adjust system volume (0-5 levels).
- Backlight: Adjust screen brightness (0-100).
- Auto Power Off: Set automatic shutdown timer (Off, 5, 15, 30 minutes).
- Restore: Reset all settings to factory defaults.
- About: View system information, including model and version number.

5. Firmware Upgrade

Ensure the device is powered off. Long press both the Dial Button (Ω) and the Power Button (Ⓟ) to enter the firmware upgrade page.
Connect the device to a computer using a data transfer cable (Type-C).
A file folder will automatically appear on the computer. Drag and drop the firmware file into this folder.
Once the upgrade is complete, the device will automatically restart.

6. Precautions

Ensure good contact between the tweezer tips and the component under test to avoid measurement errors.
Do not measure under live conditions to prevent damage to the instrument.
Online measurements are not recommended due to the influence of external PCBA connections. Measurement values obtained online are for reference only and do not guarantee accuracy.
The automatic mode does not support diode measurements. Automatically detected component types are for reference only and may be inaccurate in special cases.
Discharge capacitors before measurement to prevent damage to the instrument.

7. Contact Information

For any inquiries or support, please contact FNIRSI:

Shenzhen FNIRSI Technology Co., LTD.
Add.: West of Building C, Weida Industrial Park, Dalang Street, Longhua District, Shenzhen, Guangdong, China
Tel: 0755-28020752
Web: www.fnirsi.cn
E-mail (Business): business@fnirsi.com
E-mail (Equipment Service): support@fnirsi.com

Users who contact FNIRSI with questions will receive a satisfactory solution and an additional 6-month warranty as a token of appreciation. FNIRSI also invites users to join their community. Contact FNIRSI staff for details.

You can download the user manual, APP, and software from www.fnirsi.cn.

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