LCD Display Transistor Tester with ESR Meter LCRT4

Description

The LCR-T4 Transistor Tester is a multifunction digital component tester capable of automatically detecting and measuring transistors (NPN/PNP), diodes, triodes, MOSFETs, resistors, capacitors, inductors, and ESR (Equivalent Series Resistance). It features a clear LCD display that shows component type, pin configuration, and electrical parameters.

This compact and easy-to-use tester is ideal for electronics repair, circuit troubleshooting, DIY projects, and educational use, making component identification fast and accurate.

Key Specifications

Display and Interface

• LCD Type: Graphic LCD with backlight (128×64 pixels).

• Backlight: Yes — improves visibility in varied lighting.

Controller

• Uses a microcontroller (commonly an ATmega328P), which coordinates measurement, detection, and display functions.

Power Supply

• Primary: 9 V block battery (6F22).

• Alternative: Two Li-ion batteries configured for ~8.4 V.

Measurement Ranges

• Resistance: up to 50 MΩ, resolution ~0.1 Ω.

• Capacitance: ~25 pF up to 100 mF (100,000 µF) with ~1 pF resolution.

• Inductance: ~0.01 mH to 20 H.

• ESR (Equivalent Series Resistance): measured with capacitors (resolution varies by unit, often ~0.01 Ω).

• Resistance Measurement Range: up to ~50 MΩ.

Performance

• Testing Speed: Typically ~2 seconds per test (larger capacitance measurements may take up to ~1 minute).

• Shutdown Current: Very low (around ~20 nA) to conserve battery.

• Provided Testing Current: ~6 mA typical.

Physical

• Typical Size: ~72 mm × 62.5 mm (unit board/assembled tester).

• Material: PCB board (often shipped without permanent casing unless specified).

Features

• Automatic Component Detection – Identifies component type and pinout

• Clear LCD Display – Easy-to-read measurement results

• Wide Component Support – Diodes, BJTs, MOSFETs, resistors, capacitors, inductors

• ESR Measurement – Tests capacitor ESR for health analysis

• Pinout Identification – Displays pin configuration automatically

• Low Power Consumption – Battery powered for portability

• High Accuracy Measurement – Reliable test results

• Compact & Portable Design – Perfect for field and bench work

Package Contents

• 1 x LCR-T4 Transistor Tester / ESR Meter unit.

• Battery not included in most standard packages.

Supported Components & Functions

The LCR-T4 tester can automatically identify and measure a broad range of electronic parts:

Passive Components

• Resistors

• Capacitors (with ESR)

• Inductors

Semiconductors

• Diodes (including dual diodes)

• LEDs

• Transistors (automatic identification of NPN or PNP)

• MOSFETs (n-channel and p-channel)

• SCRs / Thyristors

• Voltage regulators and other semiconductors

Component Characteristics Measured

• Resistor values and symbol detection

• Capacitance and ESR values

• Inductance values

• transistor gain (hFE), type, and pinout

• MOSFET gate threshold and gate capacitance

• Diode forward voltage drop and polarity

Automatic Testing

• Component pinout detection without manual orientation.

• One-button operation triggers auto-test and display.

• Backlight and battery voltage displayed on power-up.

Operational Notes

• One-Touch Operation: Simplifies the user experience — place component leads in the test socket, press the button, wait for measurement.

• Auto Power-Off: Typically present to save battery life.

• Component Discharge: Before testing capacitors, ensure they are fully discharged to avoid damage.

• ESR Measurement: Useful for evaluating capacitor health, especially in power supply circuits.

• Display Backlight: Aids readability in lower light conditions.

Typical Use Cases

• Hobby Electronics Repair: Quickly identify faulty components or confirm functionality.

• Prototyping / Bench Testing: Rapid checks of discrete parts during design validation.

• Educational / Lab Work: Demonstrations of component values and semiconductor characteristics.

• Field Service: Portable tool for onsite diagnostics where full LCR meters aren’t available.