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.
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