The LCR-T4 Multi-functional ESR Meter is an automatic electronic component tester designed for identifying and measuring resistors, capacitors, inductors, diodes, transistors, MOSFETs, thyristors, SCRs, dual diodes, potentiometers and other common electronic components. BDTronics offers this LCR-T4 component tester for electronics technicians, hobbyists, students, repair professionals and DIY circuit builders who need a compact tool for quick component identification and measurement.

BDTronics LCR-T4 uses a 128 × 64 pixel LCD with backlight and a simple one-button operating system. The tester automatically identifies connected component types, detects component pin configuration and displays measured parameters on screen, making it useful for component testing without manually selecting a measurement mode.

The LCR-T4 can measure resistance, capacitance and inductance while also providing useful semiconductor parameters such as transistor current amplification factor, base-emitter voltage, MOSFET threshold voltage and gate capacitance. For capacitors above approximately 2µF, the tester can also measure equivalent series resistance (ESR), making it useful for checking electrolytic capacitors during electronics troubleshooting and repair.

Features:

• Multifunction automatic electronic component tester

• LCR meter for resistance, capacitance and inductance measurement

• ESR meter for suitable capacitors

• Automatic component identification

• Automatic pinout detection

• Tests NPN and PNP bipolar transistors

• Tests N-channel and P-channel MOSFETs

• Tests standard diodes

• Tests dual diodes

• Tests thyristors and SCRs

• Tests resistors

• Tests capacitors

• Tests inductors

• Supports LED testing and identification

• Can test adjustable potentiometers

• Measures bipolar transistor current amplification factor

• Measures transistor base-emitter threshold/forward voltage

• Measures MOSFET threshold voltage

• Measures MOSFET gate capacitance

• Can identify Darlington transistors using measured transistor characteristics

• Can detect MOSFET protection/body diode characteristics

• Measures capacitor ESR for capacitors above approximately 2µF

• Can display two resistor measurements simultaneously

• Automatic test mode simplifies component checking

• One-button operation

• Automatic shutdown function

• Very low shutdown current

• 128 × 64 LCD display

• LCD includes backlight

• Compact PCB-based component tester

• Suitable for electronics repair and DIY testing

• Powered by a 9V 6F22 battery or compatible 8.4V battery pack

Specifications:

• Product Model: LCR-T4

• Product Type: Multifunction Component Tester

• Tester Functions: LCR / ESR / Transistor / MOSFET / Diode Tester

• Display: 128 × 64 LCD

• Display Type: Graphic LCD with Backlight

• Power Supply: 9V 6F22 battery

• Alternative Power: 2 × Li-ion batteries forming an approximately 8.4V battery pack

• Testing Speed: Approximately 2 seconds

• Large Capacitor Test Time: Up to approximately 1 minute depending on capacitance

• Shutdown Current: Approximately 20nA

• Resistance Resolution: 0.1Ω

• Resistance Measurement Range: Up to 50MΩ

• Stated Resistance Range: 0.1Ω to 50MΩ

• Capacitance Range: Approximately 25pF to 100mF

• Capacitance Resolution: Up to 1pF

• Inductance Range: 0.01mH to 20H

• ESR Measurement: Available for suitable capacitors, typically above approximately 2µF

• Test Current: Approximately 6mA

• PCB Material: PCB

• Operation: One-button automatic testing

Components That Can Be Tested:

• Resistors

• Capacitors

• Electrolytic capacitors

• Inductors

• Coils

• Diodes

• Zener diodes

• Dual diodes

• LEDs

• NPN transistors

• PNP transistors

• N-channel MOSFETs

• P-channel MOSFETs

• Thyristors

• SCRs

• Darlington transistors

• Adjustable potentiometers

• MOSFET protection/body diodes

• Other supported semiconductor and passive components

Transistor Testing:

• Automatically identifies NPN and PNP bipolar transistors.

• Measures transistor current amplification factor.

• Measures base-emitter forward voltage.

• Displays useful transistor characteristics on the LCD.

• Can help identify Darlington transistors based on their measured electrical characteristics.

• Automatically determines transistor pin configuration when the component is compatible with the tester.

MOSFET Testing:

• Automatically identifies supported N-channel and P-channel MOSFETs.

• Measures MOSFET threshold voltage.

• Measures gate capacitance.

• Detects MOSFET protection/body diode characteristics.

• Displays MOSFET-related measurement information on the LCD.

• Useful for quickly checking unknown MOSFETs before circuit assembly or repair.

Diode and Zener Diode Testing:

• Automatically detects standard diodes.

• Supports dual-diode identification.

• Can identify suitable Zener diodes based on the tester's measurement conditions.

• Semiconductor breakdown behavior can be displayed where it falls within the tester's supported measurement range.

• The tester can identify components without manually selecting a diode test mode.

Capacitor and ESR Testing:

• Measures capacitor capacitance.

• Measures ESR for suitable capacitors, particularly capacitors above approximately 2µF.

• Useful for checking electrolytic capacitors used in power supplies, chargers, amplifiers, inverters and other electronic circuits.

• Large capacitance measurements may require significantly more testing time than small capacitors.

• Capacitors should be discharged before connecting them to the tester.

Resistance Measurement:

• Measures resistance with 0.1Ω resolution.

• Maximum stated resistance measurement is up to 50MΩ.

• Can automatically identify resistors.

• Can measure two resistors simultaneously in supported configurations.

• Displays resistance symbols and numerical values on the LCD.

Inductance Measurement:

• Measures inductors over an approximate range of 0.01mH to 20H.

• Useful for testing coils, inductors and other passive magnetic components.

• Automatic component identification simplifies testing unknown inductors.

How to Use:

• Install a suitable 9V 6F22 battery or compatible power source.

• Turn on the LCR-T4 tester.

• Insert the component into the tester's test terminals.

• Start the automatic test using the single operating button.

• Allow the tester to identify the component and determine its pin configuration.

• Read the component type and measured values from the 128 × 64 LCD.

• Remove the component after completing the measurement.

• For components with unknown polarity or pin configuration, use the tester's automatic identification function.

• Always discharge capacitors before testing to prevent damage or incorrect measurements.

• For components removed from a circuit, isolate the component from surrounding circuitry before testing for more reliable results.

Testing Precautions:

• Always discharge capacitors before connecting them to the tester.

• Do not connect powered circuits directly to the tester.

• Remove or isolate components from a circuit when accurate individual-component measurements are required.

• Observe component voltage and current limitations during testing.

• The tester's automatic measurement results depend on component type and electrical characteristics.

• Large capacitors can require significantly longer measurement times.

• The stated measurement ranges are dependent on the component and test conditions.

• Do not use the tester as a substitute for a dedicated high-voltage semiconductor analyzer or precision laboratory LCR meter where those instruments are specifically required.

Applications:

• Electronics component testing

• Electronic circuit repair

• PCB troubleshooting

• Capacitor ESR testing

• MOSFET testing

• Transistor testing

• Diode testing

• Resistor measurement

• Inductor measurement

• Unknown component identification

• Power supply repair

• Charger repair

• Inverter repair

• Amplifier repair

• Arduino and microcontroller projects

• DIY electronics

• Electronics education

• Hobby electronics

• Component sorting

• Workshop component inspection

• Battery charger component testing

• Switching power supply component testing

Package Contents:

• 1 × LCR-T4 Multi-functional ESR Transistor Tester

Package Exclusions:

• 9V battery is not included.

• Battery must be purchased separately if required.

• Instructions/manual are not included.

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