The Multi-Functional Optocoupler Tester is a single-hand electronic diagnostic tool designed for rapid testing of a wide range of components. It features four intelligent test gears, automatic protection, left/right indicator lamps for alignment feedback, and a built-in rechargeable lithium battery for portable use.
Physical & Electrical Specifications
- Product Size: 144 × 19 × 3 mm
- Input Interface: USB Type-C (dual-use: charging & operation)
- Input Voltage: 5V
- Input Current: 0.2A
- Battery Capacity: 120mAh (built-in lithium battery)
- Charging Behavior:
- No charging LED (internal protection board manages charging)
- Automatically stops charging when full
- Power Management:
- 15-minute automatic shutdown
- Long-press 5 seconds: power ON
- Short press: gear switching
- Short press ~0.1s: shift among 4 test gears
- Long press 1 second (when ON): reset cycle flashes green LED 6 times
General Features
- Ultra-thin, lightweight body suitable for extended one-hand use
- Four test gears requiring no external components
- Dual indicator lights (Left / Right) for real-time judgment of component condition
- Supports complex switching components (MOS, IGBT, SCR, MOC, triacs, etc.)
- Capable of generating test signals (pulse / square-wave)
- Ideal for troubleshooting, confirming pin alignment, detecting shorts, and identifying faulty devices
Supported Tests & Gear Functions
Gear 1: Square-Wave Output / Basic Signal Test
- Outputs approx. 1 kHz square wave
- Used to provide a small test signal to external circuits
- Very small current output — not suitable for long short-circuit testing
- Good for driving inputs of optocouplers, logic gates, and simple trigger circuits
Gear 2: TL431 & Simple Component Measurement
- Tests TL431 precision reference
- Measurement between Anode (A) and Cathode (K) terminals
- Normal reading approx. 2.5V
- Left/Right lamps indicate alignment
- Also used as a simple reference voltage test gear
Gear 3: Thyristor/SCR/MOC Optocoupler Test
This gear simulates triggering behavior for components requiring controlled gate current.
Included Test Behaviors:
SCR/Thyristor Test
- Matches the G–A–K (Gate, Anode, Cathode) arrangement
- Small current triggers left lamp → right lamp sequence
- Correct behavior:
- Left lamp flashes twice, right lamp flashes once
- If left/right lamp flash simultaneously, it indicates short conduction
- Excessive current components cannot be tested here
MOC / 6-Pin Optocoupler Test (e.g., MOC3021, etc.)
- Supports 4–6 pin phototriac optocouplers
- Typical behavior:
- Left lamp flashes twice = good
- Right lamp bright or weak flashing = acceptable depending on circuit
- Shorted/low-resistance components may cause both lamps to flash
Components supported include:
- SCRs
- Triacs
- MOC series optocouplers
- Optotriacs
- Photocouplers requiring gate triggering
Gear 4: Transistor/MOSFET/IGBT Test
This is the most advanced gear, supporting:
NPN/PNP Transistors
- Tests pin alignment (B, C, E)
- Normal behavior:
- Working transistor: Right lamp flashes
- Left lamp flashing = reversed or faulty alignment
- No lamp = defective or open component
MOSFET (N-MOS, P-MOS)
- Alignment based on G–D–S
- N-MOS:
- Left lamp ON = gate alignment incorrect or component faulty
- Right lamp flashing = normal
- P-MOS:
- Left lamp should stay OFF
- Right lamp flashing = proper connection
IGBT (Power Transistors)
- Tests high-voltage MOS-IGBT types
- Normal behavior:
- Right lamp flashing = proper gate conduction
- No light on one side = reversed pins or weak device
- NPN/PNP bipolar transistors
- NMOS/PMOS
- IGBTs
- High-voltage MOSFETs
Additional Component Support
- 4-pin optocouplers: Left/Right pin alignment tests, indicator feedback
- 6-pin optocouplers: Includes both transistor-output and SCR-output types
- Pulse output to trigger circuits: Useful for logic testing
- Short-test detection: Lamp indicates shorts by rapid, strong illumination
Safety Note
⚠ Do NOT test live circuits.
Connecting the tester to powered circuits can permanently damage the indicator and the internal protection board.
Package Includes
-
1 × Multi-Functional Optocoupler Tester
